All Questions
3,122 questions
0
votes
0
answers
8
views
Using trigonometry to compute the position of an object inside of a drone picture
Assume I have a certain picture taken aerially by a drone. The yaw, pitch, and roll of the drone gimbal are known, and so are the horizontal and vertical FoV of the camera. We also know the $$x, y, z$$...
- 111
1
vote
1
answer
96
views
Are sensor swabs (used but good, or new) and fluid a good choice for internal element cleaning?
From experiments, it seems that lightly-used sensor swabs (that are NOT contaminated with oils or abrasive particles) make reasonably good internal lens element cleaners and dryers (they are actually ...
14
votes
3
answers
54k
views
How to calculate the FOV in degrees from focal length or distance?
How does one to calculate the field of view (or angle of view) in degrees from the following details:
sensor size (for example, 1")
distance to target (for example, 7 feet)
focal length (for example,...
- 39.7k
9
votes
2
answers
630
views
Can any MFT lenses be turned into a practical object-space telecentric macro lens by reversing?
The micro four thirds specifications originally want lenses to be image space telecentric if possible. It seems that some MFT lenses actually follow that recommendation.
Can reversing such a lens ...
CommunityBot
- 1
0
votes
2
answers
120
views
Why do some lenses have the zoom ring reversed?
It isn't a dealbreaker for me, but it is confusing that some lenses have the zoom ring reversed. For instance, my Canon EF zoom lenses all have their lowest focal length on the left and highest on the ...
- 176k
3
votes
3
answers
119
views
Do non-constant aperture zoom lenses vary aperture when zooming, when the aperture is not set to wide-open?
I am an experienced amateur photographer and videographer using a Sony a7sII with a Sigma 28-300mm f3.5-6.3 hyperzoom lens for a music video shot. I notice that when I test the shot zooming out all ...
CommunityBot
- 1
1
vote
2
answers
186
views
Do Nikon D-100 lenses fit a D-90?
Do the lenses that fit a Nikon D-100 also fit a Nikon D-90 camera body?
CommunityBot
- 1
15
votes
6
answers
3k
views
Do you have advice for buying my first lens after kit 18-55mm (sub-$300)?
I’m looking to buy my first lens beyond the kit 18-55mm for my Pentax K-x. As a student my budget limits me to around a sub $300 offering. I am new to photography, and so I have a hard time answering ...
- 176k
0
votes
2
answers
215
views
I want to measure far distance focus in a short space, but give myself a greater FOV, how would I do that?
Building off of this question, say I put a 1 m lens in front of a camera so I can see a virtual image at 500 m to focus to, when I place an object within the focal length (0.998 m), but I want a ...
CommunityBot
- 1
1
vote
1
answer
342
views
Is there a free alternative to Photoshop's Adaptive Wide Angle filter?
Adobe Photoshop provides an Adaptive Wide Angle filter to to correct lens distortions. I really like the intuitive user interface which allows me to just draw a line to fix issues. Is there any free ...
CommunityBot
- 1
0
votes
1
answer
28
views
Are Nikon N90s parts compatible with a Nikon Coolpix L810?
I was able to obtain a Nikon n90s camera with multiple lense attachments (Aspherical LD Tamron and a Hoya 58mm Skylight (18) by Vivitar I think) two flash attachments, and a MD-15 Motor drive. Would ...
- 176k
47
votes
7
answers
14k
views
How do constant aperture zoom lenses work?
Cheaper zoom lenses usually are faster at the wide end and slower at the long end (for example, the $150 Canon EF-S 18-55mm f/3.5-5.6). More expensive constant-aperture zoom lenses have the same ...
- 176k
0
votes
4
answers
445
views
Does a lens with this zoom range exist?
I want to buy a zoom lens for a DSLR but I want its Focal length to start from a small number (18, 55, 100, 200) and end to a very large number (1300, 2600) so it can see near and far. Also I want it ...
- 176k
1
vote
3
answers
347
views
Why don't zoom lenses provide higher aperture for lower focal lengths?
I have a Nikon lense with below specification:
Focal Length Range: 18-140mm
Maximum Aperture Range: f/3.5-5.6
So the diameter of the lense is at least: 140/5.6 = 25mm.
My question is if the lense has ...
- 176k
0
votes
1
answer
75
views
For a Sony crop E-mount body, how do I choose between the 50/1.8 and the 55-210?
I'm not a professional, just a hobbist. I have a Sony ZV-E10 with the kit lens (16-50 mm, F3.5-5.6). Now, I want to buy a new lens and want to choose in the budget range, but not sure how to decide ...
- 53k
1
vote
3
answers
5k
views
70-300 AF-S Lens Won't Autofocus on one of my D7100's
I recently purchased a used Nikkor 70-300 AF-S VR lens used from B&H that is in "Excellent" condition. I have 2 Nikon D7100 bodies that I shoot with and both autofocus just fine with all of my ...
2
votes
6
answers
16k
views
How can I fix Err 01 with a film-era Sigma lens on a Canon DSLR?
I have a new Canon EOS Kiss camera and a friend of mine has a Sigma Aspherical IF 28-200mm lens she used on an old Canon EOS film camera (old as in 10 years or so). I tried using the lens on my camera....
- 209
0
votes
2
answers
52
views
Canon 600D Kiss X5 Optical Viewfinder Vignette Using Canon EF 50mm 1.8
Canon 600D Kiss X5 Optical Viewfinder Vignette Using Canon EF 50mm 1.8
Hi, is it normal to get a heavy vignette (large round border) using a 50mm 1.8 through the viewfinder (photos are ok as is the ...
- 624
2
votes
1
answer
392
views
Canon 6D Mark-ii + Kenko C-AF 1.4x Teleplus pro 300 + Kenko 1.4x teleplus HD shows Error
I have a Canon 6d mark-ii camera. However, the kenko lens are not working and yesterday, I tried to fix my camera with a friend. They had the same camera and lens but those are working with mark-ii ...
CommunityBot
- 1
0
votes
2
answers
10k
views
Sigma 17-50 f/2.8 or Sigma 17-70 f/2.8-4 (C) for Canon 600D
I know this has been asked a lot.
I have Canon 600D with Canon EF-S 18-135mm f/3.5-5.6 and Canon 50mm f/1.8 lenses.
I'm looking to upgrade the zoom lens with something with better IQ, sharpness, bokeh,...
- 131
0
votes
2
answers
396
views
Why does my Nikon 12-24 1:4 G ED lens get recognised as Tokina lens?
I recently bought a used Nikon 12-24mm 1:4 G ED lens in almost mint condition. My camera is a Nikon D5100.
I compared it to the similar spec Tokina 12-24mm by looking at a lot of different reviews ...
21
votes
6
answers
14k
views
Is it true that there are no stabilized prime lenses (and if so, why)?
Fast prime lenses like the Canon 50mm f/1.4 lens work nicely in low-light situations. But I'm quite sure they would work even more nicely if they had optical image stabilizers. It seems to me that no ...
- 3
1
vote
2
answers
273
views
Is 35mm 1.8 lens suitable for Product, interior photography?
I'm still a beginner, is 35mm lens is suitable for product photography, mostly e-commerce products and hotel room pictures.
- 33.3k
1
vote
3
answers
1k
views
Quality difference between Sigma 30mm f1.4 Art and Contemporary
Sigma has two versions of its 30mm f1.4 lens: One in the Art line
with mounts for various DSLRs and one in the Contemporary line with mounts for various
mirrorless cameras.
I'm wondering why the ...
- 25.4k
1
vote
4
answers
2k
views
Tokina 100mm Macro f2.8 D wont autofocus on a Nikon D7500
I just got this camera recently with the lens aformentioned, however upon usage, I wasn't able to autofocus anymore. Any fix?
- 1
3
votes
2
answers
142
views
Shooting on B&W infrared film with Canon L glasses
Canon EOS-1V manual says about shooting on B*W IR film:
Use a lens which provides IR index. With L-series lenses which do not have an infrared index, there is no need to compensate for infrared film.
...
- 39.7k
0
votes
0
answers
35
views
Bought a Minolta Minolta AF 70-210mm f/ 4 lens can it fit on my Canon Rebel T7 body? [duplicate]
Bought a Minolta AF 70-210mm f/ 4 and I use a rebel T7 is there a adapter available to use for them?
- 1
4
votes
4
answers
2k
views
What improvements I could expect upgrading from Canon EF 55-250mm IS to a Canon 70 - 300mm? [duplicate]
I enjoy taking photos with my current telephoto (55-250) but I wonder if the 70-300 could be a worthwhile upgrade. As of November 2013, it would be around a $350 investment if I deal hunt and sell my ...
- 176k
0
votes
1
answer
69
views
Diffrence between these 2 lenses
I have a DX AF-P NIKKOR 70-300mm 1:4.5-5.63G ED LENS. is it worth getting a Nikon 70-300mm f4.5-5.6AF-P ED VR LENS. Is there a benefit?
- 22k
1
vote
2
answers
515
views
Aperture and field of view - percepted by eye vs camera
I know how aperture works and why is it not restricting field of view, but I somehow cannot get around the following:
Aperture doesn't restrict field of view for the camera, but when I take the lens ...
- 153
1
vote
2
answers
127
views
What are the filter size of these vintage lenses?
These lenses I have from the 1960s don't have a filter size marking; can someone find them out for me?
Minolta MC Rokkor-PF 1:1.4 58mm (5592305)
Minolta MC Tele Rokkor-QD 1:3.5 135mm (1531042)
...
- 22k
7
votes
6
answers
23k
views
Does the Nikon 35-70mm really equal the newer 24-70mm in image quality and sharpness?
I am planning to buy a AF-S NIKKOR 24-70mm f/2.8G ED, but I saw a second hand 35-70 f/2.8 AF in a store nearby. I did some research and I stumbled upon Ken Rockwell's 35-70 review, in which he states:
...
- 12.6k
2
votes
4
answers
1k
views
Easy tool to correct geometry of photographed document
I have a photograph of a printed document that I made for lack of easy access to a flatbed scanner at the time and place I had easy access to the document (in case you ask, the document was sent to me ...
- 797
5
votes
3
answers
318
views
What lens would suit an A4 large format camera
I'm planning on building a scanner camera. The principle of which is simple: everything's built like a large format camera, except the film is a simple scanner controlled by computer.
Now, building ...
- 624
1
vote
1
answer
86
views
Identifying unknown lens (Auto Rexar 35mm)
Found an old lens in a thrift shop, marked as "Auto Rexar", made in Japan. Can anyone identify who made it, date of manufacture, specs, or other info. It has a Minolta mount.
Seems to be no ...
- 19.4k
2
votes
5
answers
188
views
Thin lens focal length vs perspective
Thin lens and perspective
It's well regarded focal length of a camera lens does not affect perspective.
While by using the thin lens equation
$$\frac{1}{s}+\frac{1}{i}=\frac{1}{f}$$
we can compute the ...
- 22.2k
0
votes
3
answers
299
views
40mm f/2.8 or 50mm f/1.8 on APS-C for versatile shooting?
I'd like to get a new lens, but I'm not sure weather to choose a focal length of 40 mm or 50 mm (mounted on APS-C) : the EF 40 mm f/2.8 or the EF 50 mm f/1.8 from Canon
I'm not specialized in ...
- 797
0
votes
2
answers
71
views
What is causing the camera to have pincushion distortion in air and then barrel distortion in water?
I have been working on a research project this summer looking at penguin body cameras and how we can measure the size of prey they catch from the video footage. This involved me taking some ...
- 39.7k
2
votes
2
answers
980
views
How to make sure to only get full frame lenses for the Canon EF (non-mirrorless) mount?
As an amateur, I am looking for used lenses for my Canon EOS 5D Mark II. I know that it's so called full frame, like the old 35mm film cameras. I am confused with all the abbreviations and ...
- 797
0
votes
5
answers
120
views
As a beginner, how do I figure out which lens to get next? [duplicate]
I have a Canon R50 camera and am looking for a more versatile lens. I am looking at RF 24-104 STM 4 - 7.1 or with an adapter the EFS 18-135 3.5 5.6 USM
Also looking at a 18-250mm F3.5-6.3 DC MACRO
I'...
- 195
1
vote
3
answers
117
views
What is the difference between working focus distance and infinity focus in Camera Lens (specially machine vision camera)
I am new to camera lenses and am trying to understand their details. I have learned concepts like aperture, focal length, FOV, IRIS, and different mounts (C, CS type, etc.).
I have a question ...
- 39.7k
3
votes
4
answers
1k
views
How do I tell which kit lens option is more all-purpose? [duplicate]
I have been shooting photos for a long time with a smartphone, and now I want to "gear up" to improve my skills. I mostly shoot landscapes but I'd also like to learn to do some portraits.
...
- 51
2
votes
1
answer
84
views
Mounting Canon focus by wire lens (EF 50mm f1.8 STM) to EOS 300
I recently got a Canon EOS 300 (the film version, not digital) and would like to buy a faster lens in addition to the kit lens which I received with it.
I see that the 50mm f1.8 STM is still in ...
- 123
2
votes
3
answers
150
views
What specs should I look at when shopping for a lens to take talking-head-at-a-desk and closeup shots?
I want to purchase a lens for my Nikon D750 that can zoom in and out, and will be good for taking selfies/vlogging at a desk. It would also be nice if this lens could also be used to shoot words on a ...
- 53k
0
votes
3
answers
104
views
Dirt is on the sensor or in the lens
Hi i'm new in dslr cameras. I have this canon and when i take pictures of the sky this happens.
I already clean the sensor and also the lens (i open it to clean from inside), but still have this fuzz ...
2
votes
1
answer
3k
views
How to fix stuck aperture?
I have a Micro-Nikkor 55 mm 1:2.8 lens. The aperture appears to be stuck. Is it worth trying to repair the lens? Are there any good guides for disassembling the lens?
- 552
5
votes
5
answers
14k
views
Should I replace the Canon 18-55mm f/3.5-5.6 kit lens with a 40mm f/2.8 or 50mm f/1.4?
So I'm about to buy my first DSLR (definitely a Canon, probably the 700D) and my original plan was to buy the one with the included 18-55mm f/3.5-5.6 kit lens.
At the same time I was thinking about ...
- 176k
0
votes
2
answers
152
views
Should I upgrade my lens or am I just looking at photos on a pixel level?
I'm new to photography. I've had Nikon D3300 paired with Nikkor 18-70mm f/3.5-4.5 lens for half a year (shot ~2k photos) now and it's been my first ever contact with a DSLR. The reason why I want to ...
- 19.4k
2
votes
1
answer
692
views
How to disassemble this part of the lens?
This is a Nikkor 1.8 50mm Which seems to have fungus inside the glass. How do you disassemble this part to clean from the inside?
0
votes
3
answers
427
views
Converting panoramic MF lenses to 35mm equivalents?
This random website I found talks about estimating the 35mm camera equivalent lens sizes for various MF frame sizes (645, 6x6, 6x7, 6x8 and 6x9). But I am interested in shooting panoramic MF with ...
- 2,098
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