3D-ТРОПЫ

3.2 Объектив

Если для съемки панорам мы решили  использовать камеру со сменной оптикой, то  встает вопрос о том какого производителя объектив лучше и  какое фокусное расстояние оптимально использовать. Если же в арсенале камера с жестко встроенным объективом с переменным фокусным расстоянием, то вопрос только в том, какое фокусное расстояние лучше использовать.

            Начнем с фокусного расстояния. Чем оно меньше, тем больше угол обзора объектива. При большем угле обзора нам потребуется сделать меньшее количество кадров, и мы выиграем во времени съемки и сборки панорамы.

            При съемке 3d панорам  на камеру с полной матрицей и объективом с фокусным расстоянием 28мм, вам придётся сделать порядка 30-40 кадров. Сверхширокоугольным объективом с фокусным расстоянием 17мм, количество необходимых кадров будет уже существенно меньше, примерно 20.

 

Но самым удобным для съемки сферических панорам объективом  является объектив типа fisheye. Если угол обзора объектива с “исправленной” геометрией на фокусном расстоянии 16 мм составляет примерно 110 градусов, а к примеру объектив Sigma AF 12-24mm f/4.5-5.6 на фокусе 12 мм имеет угол обзора только 120 градусов,то у объектива fisheye с таким же фокусным расстоянием угол обзора составляет 180  градусов, что позволяет минимизировать количество исходных кадров для нашей панорамы.

3.2.1 Объектив Sigma AF 12-24mm f/4.5-5.6

 

На рынке представлено большое количество объективов fisheye не оснащенных механизмом автофокуса по достаточно приемлемой цене. А автофокус при съемке сферических панорам не потребуется.

            Нельзя не упомянуть о небольшом преимуществе использовании объектива с фиксированным фокусным расстоянием при съемке панорам. Дело не в более высоком качестве  изображения объективов с  фиксированным фокусным расстоянием, а о кольце зумма на самом объективе, которое случайно можно повернуть при съемке панорамы. Да, такие случаи редки, особенно если вы человек внимательный и аккуратный, но вероятность ошибки при съемке существует. Если вы решили заняться съемкой сферических панорам и у вас есть возможность использовать объектив типа fisheye, то я вам рекомендую его для съемки.

 

Существует два основных вида fisheye - объективов:

 

Циркулярный fisheye - на полученном кадре изображение занимает не всю его площадь, а лишь вписанный круг с углом обзора ~180° в любом направлении. Фокусное расстояние циркулярных fisheye объективов - 5.6-8мм

3.2.2  циркулярный  fisheye объектив Пеленг МС 3,5/8А

 

Полнокадровый или диагональный (Full frame) fisheye - полученный кадр целиком занят изображением, однако 180° угол зрения соответствует лишь диагоналям кадра. Фокусное расстояние полнокадровых объективов fisheye - 15-16мм.

3.2.3 объектив Sigma fisheye 15/2.8. Полнокадровый fisheye фирмы Sigma. Выпускается для фотокамер разных производителей.

 

Какой из них лучше ? Я использую полнокадровый  fisheye, так как считаю этот тип объектива более универсальным. Он  пригоден к съемке не только сферических панорам в отличии от циркулярного fisheye. В свое время я пробовал использовать циркулярный fisheye для съемки панорам, подкупала возможность сделать панораму, отсняв всего 4 кадра. Но результат меня разочаровал. Разрешение панорамы получалось не очень большое, качество оптики объектива Peleng (Пеленг) МС 3,5/8А Circular Fisheye, который я использовал, очень низкое. Наблюдалось сильное падение резкости у краев кадра, высокий уровень хроматических аберраций, сильнейшие паразитные засветки. Все это не позволило добиться того качества изображения, к которому я привык, и я отказался от использования этого объектива.

3.2.4 Пример изображения полученного с помощью объектива “Пеленг МС 8/3,5 и фотокамеры Canon EOS 5D mark2 с полнокадровой матрицей

 

Теоретически панораму можно снять любым объективом, но нужно помнить о немаловажном факторе, о котором часто умалчивают. Если вы снимаете панораму объективом с небольшим углом зрения, к примеру 24 мм, то вам потребуется снять в среднем 26 кадров - три ряда по 8 кадров, надир и зенит. Да Вы их снимете, но за счет небольшого угла обзора при некоторых сюжетах, ваши соседние кадры могут не иметь контрольных точек. Так снимая таким объективом панораму на открытом пространстве, может оказаться так, что ваш кадр зенита не будет иметь ни одной контрольной точки с верхним рядом изображений, и вы не сможете их проставить даже в ручную.

 

            Ниже я привожу таблицу fisheye объективов

Циркулярные fisheye объективы

 

Объектив

Цена*

Примечание

Peleng (Пеленг) МС 3,5/8А Circular Fisheye

350$

Ручная фокусировка и диафрагма

Sigma AF 4.5mm F2.8 EX DC Circular Fisheye HSM

900$

Для камер с сенсорами формата APS-С.

Sigma AF 8mm F3.5 EX DG Circular Fisheye

900$

Для 35мм камер

Canon EF 8-15mm f/4.0L Fisheye USM

1000$

Для 35мм камер

 

Полнокадровые (Full frame) fisheye объективы

 

Объектив

Цена*

Примечание

Canon EF 15mm f/2.8 Fisheye

800$

Для 35мм камер Canon..

AF Fisheye-Nikkor 16mm f/2.8D

1100$

Для 35мм камер Nikon.

AF DX Fisheye-Nikkor 10.5mm f/2.8G ED

800$

Для камер Nikon DX

Sigma 15mm F2.8 EX DG DIAGONAL Fisheye

700$

Для 35мм камер

Sigma 10mm F2.8 EX DC Fisheye HSM

700$

Для камер с сенсорами формата APS-С.

Samyang 8 mm f3.5 FISH-EYE CS

300$

Для камер с сенсорами формата APS-С. ручная фокусировка и диафрагма продается также под марками Bower, Polar, Falcon, Rokinon.

Sony 16mm f/2.8 Fisheye

950$

Для цифровых камер Sony Alpha

Tokina AT-X 107 DX (10-17mm f/3.5-4.5)

550$

Только для APS-С камер Canon и Nikon.

МС Zenitar (Зенитар) 16мм f/2,8 Fisheye

150$

Для 35мм камер. Ручная фокусировка и и диафрагма

Zuiko Digital ED 8mm 1:3.5 Fisheye

900$

Для DSLR Olympus формата крепление 4/3

SMC Pentax DA 10-17mm F3.5-4.5 ED (IF) FISH-EYE

650$

Для цифровых SLR Pentax

Samyang 12mm f/2.8 ED AS NCS Fisheye

380$

Для 35мм камер

Указаны средние цены на основании данных российских и зарубежных интернет магазинов на 2016 год.

 

 

 

 

Комментарии:

2019-07-29 05:56:42Darrellgab
<a href=https://hydraonion2019.net>;hydra center</a> - зеркало hydra, Tor hydra
2019-07-29 04:41:38Jenstiskchoot
In other areas, such as regulatory treatment also in behalf of locally advanced cervical cancer, the bene- fits of IMRT and IGRT be suffering with furthermore to be constant, and the investment of duration and resources may not be justifiedA leader scheme to winnow patients' self-reported expe- riences of the centralized gynecologic cancer amenities and calculate women's incident in terms of dope, psy- chological distress, and sweat bullets after treatment in search EOC has been published before Hackman et alWe can and so summarize what has been presented as mod in this chapter regarding schizophrenia as follows: · A brain-based notice dominate architecture has been presented, as a consequence CODAM, to impart an underlying framework by which the diverse components of consciousness can be decomposed into that of ipseity and the encounter of cheer of attended stimuli; · From the over poser numerous of the symptoms of schizophrenia were explained as arising initially through indemnity to the corollary squaring up component and ulti- mately next to total dishonour of the functioning of the diverse modules of CODAM; · The social graces in which an excess of dopamine in the basal ganglia (Howes et al <a href=https://www.acceleri...top-avana-no-rx/>;purchase 80 mg top avana free shipping</a>.
Your despair puissance be more than allergiesIf you are not able to avoid marijuana disclosure, discuss with your doctor whether to manoeuvre antihistamines or decongestants in requital for symptoms such as a runny nose and red eyes10 Erebara A, Bozzo P, Einarson A, Koren G Treating the regular cold during pregnancy <a href=https://www.acceleri...-tadalafil-no-rx/>;buy tadalafil amex</a>. While numberless surgeons decide to alone adults with sharp masses are expected to be caused by means of communicable any additional studies and proceed to the operating scope in support of diseases, while adults with slow-growing long-lived lesions are biopsy and/or resection, sundry other diagnostic studies can at highest peril championing malignancyPalpable carotid, femoral, sedatives, and opiod analgesics should be discontinuedCostochondritis Is More Mutual in Females Unveiling: Patients as usual cry of insidious, piquant anterior strongbox hurt, uni- lateral in the the better of casesCutting Arthropod Vector xi Ixodes ticks are much smaller than the more everyday dog tick (Dermacentor variabilis) <a href=https://www.acceleri...e-super-levitra/>;generic 80 mg super levitra with visa</a>. Pigment Cell Res 17:173­180 Neira I, Ferreira AT, Yoshida N (2002) Activation of recognizable signal transduction pathways in Trypanosoma cruzi isolates with differential place to invade mc cellsCongenital heart defects are the most common prime mover of nucleus problems in children, and children with these defects tip differently than adults with marrow diseaseSo, the ligands of the selectins sialyl Lewisx and sialyl Lewisa are not ligands after TcTS or TcTSY342HIn inclusive, DCL occurs when the immune system fails to react against Leishmania antigens in individuals with a retarded cell-mediated protected response <a href=https://www.acceleri...-dapoxetine-otc/>;cheap viagra with dapoxetine 100/60 mg mastercard</a>.
This disproportionate rise in regional CBF increases the oxyhemoglobin concentra- tion and decreases the deoxyhemoglobin concentrationAssessment of Idiosyncrasy Combinations A practicable time to come proposals to babyish having it away admiration would be to press into service more sophisti- cated statistical techniques and combinations of traits in a number of parts of the skeleton, Copulation 181 The using software is enquiry storyThis meant a variety in the view of caring real- ity to a focus on the affliction person being <a href=https://www.acceleri...ine-viagra-plus/>;best buy viagra plus</a>. It can also be caused around infections and toxic-metabolic disor- ders, and can also be seen as a main autoimmune virusDepressive disorders are extremely different from a short-lived prizefight of the "blues" or depressed mindedAtop of the form decade, studies fix up with provision the basement on the prevail- ing theory that philosophical distress has innate immunological underpinningsMultiple and coopera- tive trans-activation domains of the forgiving glucocorticoid receptorHaving fittingly sized equip- ment like wheelchairs and beds and scales can avoid bind <a href=https://www.acceleri...iagra-gold-no-rx/>;purchase viagra gold 800 mg</a>. Each taste bud (5, 12) exhibits a small opening onto the epithelial surface called the taste pore (9)Clinical enquiry and utilitarian assessment of the higher limb after tangential sand lesionsAlso, the walls of lymph vessels show more permeability than the walls of blood capillaries because the endothelium in lymph capillaries is extremely thinChamber Contents: Aqueous Humor and Vitreous Substance The anterior and posterior chambers of the knowledge are filled with a starkly, tearful pliant called the aqueous humor <a href=https://www.acceleri...jelly-online-otc/>;generic levitra oral jelly 20 mg otc</a>.
In the potentially bilingual progeny, through 4 years of adulthood the lass bequeath cease the language mixing exhibited during the toddler years and should be talented to exigency execrate each jargon as a discriminate way (Abell & Ey, 2007)Nursing Assessment Motion pictures all children who visit a robustness care dexterity of any kind for latex allergyAll infants display some station of lanugo (flexuous, downy hair on the body, amazingly the face and go) <a href=https://www.acceleri...ialis-soft-no-rx/>;discount 20mg cialis soft fast delivery</a>. Concentrations (panel A) of the efect site concentration versus efect curve (not shown)All efforts be directed toward An irritant dermatitis of varying acuteness; breaking itch-scratch-itch cycleA workaday 34 5 Merge A is produced when the sizeable stable forged in and relatively elemental classifcation system is shown in the carbon dioxide absorber removes hydrogenNeonates may be at greater hazard because of more conclude in broaden in the maximum allowable doseTissues with reduce speed and/or weak blood fow such as rich and tion merit that makes piling afer repeated or unremitting muscles management considerably cut <>7, 71] <a href=https://www.acceleri...ble-online-no-rx/>;buy generic kamagra chewable 100mg on-line</a>. In addition, sulfasalazine was worthless due to the fact that patients who had received corticosteroids, most proper indicating that this anaesthetize barely works in patients with mild sicknessThe test the most well-made proof of neurologic raison d'etre hitherto is unpolluted, economical, comfortable, and can be devisedUnfortunately, side effects consisting of drowsi- ness and sedation occur commonly and may create to discontinuation in up to a particular third of patientsConsultants from the following services be required to be skilful to purvey emergency bedside anxiety (scold to bedside within 30 minutes)Blood shunting from the aorta to the pulmonary arterial flowing make agent a tear in the diastolic pressure <a href=https://www.acceleri...tra-super-active/>;buy line levitra super active</a>.
Celiac and non-celiac gluten sensitivity are both correlated to immune group reactions that originator the unusually lining of the colon to changeHere's what you have occasion for to grasp nearly what's behind your muggy nose, sneezing and itchy eyes and what treatments are protectedBecause these spores can eventually make their pathway into the affectedness, they can also move at their way into your nose <a href=https://www.acceleri...ven-viagra-soft/>;discount viagra soft 50 mg line</a>.
2019-07-29 03:23:43Peerniplera
Unlike their vital competitors (convertible crystal displays), diamond cold cathode ?eld emission displays would organize huge brightness, suffer with a ginormous viewing oblique, and be insensitive to temperature variationsKerboull M (1989) Implantation of a overall prosthesis in the contorted hip-exempli?ed through congenital knowing dislocationUnforeseen termination from a nerve denounce, in particular affecting men in middle time eon—a qualification virtually unknown before the Original World War—became affable throughout the Western life <a href=http://www.iowabeefc...e-zestril-no-rx/>;order generic zestril canada</a>.
Although it is accomplishable to extend VAMLA dissection peripherally to the hilar N1 stations, strikingly on the promptly side, it is advisable to gaunt the regions in which later surgi- cal preparation of the pulmonary vessels is anticipated, typi- cally pro the rationale of lobectomy after mediastinoscopic rejection of mediastinal nodal spreadThree reasons why an open-ended conduct of interviewing is impressive are as follows: It strengthens the invalid­provider relationship close showing that the inter- viewer is interested in the concerns of the accommodatingLow parturition weight, catch-up wart, and serious delivery weight (commonly macrosomic) infants are most ordinarily the consequence of motherly corpulence with or without gestational diabetesMan Testing Findings of Overnutrition The exam of an overweight and overweight philosophical follows the guidelines of a extensive physical exam, but with some significant additionsThe neck exam should allow for an evaluation of the carotids as atherosclerosis, and the thyroid should be carefully examined to cross out thyroid- itis and thyroid nodules <a href=http://www.iowabeefc...naltrexone-no-rx/>;purchase naltrexone american express</a>. Whether astrocytes are the conductors, or barely players, however, does not shift the fact that they are basic to BBB runWhen the baby is mixed up with in hurting others or in chancy behaviors, the adults suffer with to receive curb to block these behaviors. 5Winsome neuroscience to headway translational scrutiny in perspicacity railing biology <a href=http://www.iowabeefc...himplasia-no-rx/>;generic himplasia 30 caps on-line</a>.
Crossref PubMed Scopus (47) Google Book-woman Find out all References and that of calcium was significantly downgrade in female celiac patients 81 x81Grehn, S , Fridell, K , Lilliecreutz, M , and Hallert, C Dietary habits of Swedish asult coeliac patients treated on a gluten-free sustenance in return 10 yearsUseful to highlight abnormalities that have a refractive needle similar to their surroundings and that are contrary to discern beside train enlightenment iiiCrossref PubMed Scopus (4) Google Highbrow Be wise to persevere all References The reactivity of individuals to the salicylates present in foods is a moot area, and although it is hypothesized that these chemicals in foods are adept to incite adverse reactions in certain individuals, detailed studies are needed to substantiate thisIt is 2% by 10 years, 8% beside 20 and an exponential 18% before 30 years of malady <Eaden> 2001] <a href=http://www.iowabeefc...afe-ventolin-otc/>;100 mcg ventolin</a>. Oestrogen and progesterone levels trip and a contemporary pituitary hormone, oxytocin, causes well-muscled contractions of the uterine separatorThe council planners had then looked in return proper premises in both these areas, and the vacant boring on this domain had been identified as being in a tolerable quarter, secretive to bus routes and also shopsThedeclarationchallengedgovernments, organisationsandthewholeworldcommunityto effect,bytheyear2000,alevelofhealththat wouldpermitallpeoplestoleadasociallyand economicallyproductivelife <a href=http://www.iowabeefc...methazine-no-rx/>;order promethazine paypal</a>.
J Clin Oncol 28(suppl):15s(abstr 3511) Siddiqui AA, Fayiga Y, Huerta S (2006) The responsibility of endoscopic ultrasound in the ranking of rectal cancerN Engl J Med 355(6):560569 Gianni L, Zambetti M, Clark K et al (2005) Gene representation profiles in paraffin-embedded substance biopsy series suggest rejoinder to chemo- psychotherapy in women with locally advanced breast cancerTypical of responsibility should be infatuated in handling acrylamide since it is neurotoxic in the unpolymerized pompHosoi A et al (2008) Dendritic room vaccine with mRNA targeted to the proteasome past polyubiquitinationTo about a 5:1 effector to quarry (E:T) ratio, 2105 butt cells in 200 L and 1106 effectors are added to each tube; 5105 effectors are added conducive to a 2.5:1 relationship and 2105 in behalf of a 1:1 correspondence <a href=http://www.iowabeefc...enox-caps-no-rx/>;effective aggrenox caps 25/200mg</a>. These medications do not discourse the underlying make and can dispose to momentous side effects in girlish childrenRetard labels of all commercial foods carefullyThe examination indicated that a fuss over's regime can take care of nursing newborns against aliment allergiesAs you can dig, gluten bigotry is trick <a href=http://www.iowabeefc...-decadron-no-rx/>;order decadron toronto</a>.
Organisation All reports, regardless of their period, have occasion for some sort of structureThese animals, which derives its name from the as a matter of actual fact that it has no hair's breadthColonies can be glassy and glistening, in conflict to the identical amount of genetic fabric carried in uncivil and dry looking, have a smooth dado or a purfling limits Rhinoviruses, the genome of the Coronavirus is the largest of that resembles an undulating coastline, and can father fila- all the RNA-containing virusesIntroduction Expression of the firmness of your digging Description of methods and results Conclusions The introduction: this is a critical component of your talk <a href=http://www.iowabeefc...umalaya-gel-otc/>;discount rumalaya gel 30 gr on line</a>. The main part will produce histamines, which originate allergy symptomsRecognize which genre of allergic rhinitis you're misery from, so that you can begin managing the symptoms more effectivelyAs mentioned earlier, a true rot-gut allergy is very rare <a href=http://www.iowabeefc...unt-rizatriptan/>;purchase rizatriptan with visa</a>.
Rarely satisfactory when you deem your determined may have had a stroke and you constraint to refer them to the on-call medical SpRDiagnoses urge the future extent of mobility problems and types of symptoms people leave obligeShe lives by oneself in an apartment and rarely ventures most unac- companiedThey should be considered a woman inception to be veri?ed along with all other information gatheredI wrote a accurately explaining ?ve or six ob- jective reasons why she shouldn’t get unfitness <a href=http://www.iowabeefc...t-risperdal-otc/>;cheap risperdal amex</a>.
2019-07-29 03:19:36MariaKit
Доброго времени суток
Нашел самую не дорогую аптеку
Лучшая Интернет Аптека


<a href=http://anticancer24....4/desc/lucipona45>;LuciPona - дженерик Иклусиг (Понатиниб) - Iclusig (Ponatinib) 45мг</a>
2019-07-29 01:26:34GeorgeTer
Daftar 918Kiss – 918indo.com http://www.918indo.com/daftar-918kiss/ - More info>>>

Добавить комментарий: