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A photographic lens is used to focus the light onto film or a digital sensor. Many cameras have interchangeable lens systems, allowing the photographer to choose the type of lens to use.

learn more… | top users | synonyms (1)

4
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3answers
81 views

Using a focal reducer to match a lens to a crop sensor camera

Context So I've recently watched a video about how Tony Nortrup is referencing that you should buy the lens that perfectly fits your image circle, to get the most sharpness out of it, or so I'm ...
2
votes
2answers
37 views

Are there any cheap, fast lenses capable of highschool sports photography?

I recently took on my first paying client, and she is also into photgraphy. She usually does sports for her highschool yearbook. They just have an entry level Canon DSLR with a kit zoom on it that ...
2
votes
5answers
232 views

Why does it seem like large sensors are necessary for good low-light performance?

Phone manufacturers have recently started advertising the size of the photosites on smartphone camera sensors. They argue that larger photosites lead to better low-light performance. I think a good ...
1
vote
0answers
21 views

Nikkor 28-70mm F2.8 lens problem: AF and aperture don't work

I bought this lens second hand from someone who has no idea about this kind of thing. The price WAS low, but not low enough to justify a broken lens. It has no glass scratches and at 300£ it seemed to ...
1
vote
5answers
201 views

Lens or Filter to Blur Thermal Camera Images

I know this question sounds weird, but I am looking for some kind of lens or filter to blur the images taken by a thermal camera. I don't need to blur a specific part of an image, just a blur ...
1
vote
2answers
94 views

Is it safe to test a (possibly) salt-water damaged lens (Tokina 11-16mm) on a new camera body?

I have a Tokina ATX AF116 DXII S - 11-16 mm F2.8 AT-X (II) 116 Pro DX for Sony and I recently ruined my Sony α65 through a salt water wave which caught me out during a storm photoshoot. Weeks ...
2
votes
1answer
397 views

Nikon 16-85 VR focus noise problem?

My 16-85 VR is doing some weird noise during focus, manual or auto. It's like an hiss. I asked in a local shop and they said it can be some microdust inside the lens. But I'm a little worried it can ...
3
votes
2answers
454 views

Why is the Depth of Field Preview button necessary?

I've looked far and wide but i cannot find the answer for this question. I know some older cameras and lenses used to have aperture rings on them, which allowed the user to set how open or closed the ...
0
votes
0answers
45 views

Help me choose 2 lens for 2 different photoshoot type [closed]

I decided to buy Nikon D7000 body, and I'm thinking about 2 lens, but I can't decide myself which lenses to buy. So I am thinking about Nikkor 35mm and Nikkor 18-200 or 18-140. I usually shoot ...
0
votes
1answer
24 views

Sigma 70-300mm 1:4-5.6 APO Macro super lens

Is there an adapter to fit the Sigma 70-300mm 1:4-5.6 APO Macro super lens to the body of a Sony a200
7
votes
2answers
3k views

What are ED elements?

I find that some lenses are indicated with the letters "ED", referring to some special type of lens element. What are ED elements, and what advantages do they bring? Note that this question isn't ...
4
votes
2answers
95 views

What can I put inside a 39mm gel holder?

Context So I have a 39mm gel holder for my Nikon 300 f4. AF lens. Question What can I put inside it? It doesn't look like a normal filter will work.
0
votes
0answers
89 views

Which DSLR Camera is good for taking photographs of human body skin [closed]

I am doing a project on image processing. I need photos with more clarity, details and less noise. The photo will be taking in daylight condition. Which DSLR camera i need to buy. Is there any ...
2
votes
1answer
128 views

Does a lens exist that is parfocal, has a linear zoom throw, and is affordable?

I'm working on a project to create, essentially, a servo-powered zoom lens, using a (D)SLR zoom, a zoom ring gear, and a stepper motor. After mounting the zoom ring gear, I'll attach a pinion gear to ...
13
votes
7answers
5k views

What is a normal lens?

I've heard people call 50mm lenses "normal lenses". For a lens to be considered normal, does it have to be exactly 50mm or is there some leeway? Does the normal focal length depend on crop factor of ...
2
votes
0answers
99 views

How to obtain 180° FOV and little optical errors?

I'm thinking about building an all-sky camera, i.e. an automated camera that points straight up to the zenith and that captures the entire sky down to the horizon. The idea is to capture celestial ...
-2
votes
0answers
51 views

The viewfinder goes dim [closed]

My sigma 24-70mm is having issues focusing from the viewfinder, it goes dim n unable to focus when trying to take a shot. But appears to work normally from the live mode
2
votes
2answers
128 views

For those that can afford fancy teleprimes is it preferred to use AF or MF for birds?

Context I'll be using a Nikon 300mm/f4 on my Sony a6000 and seeing what birds I can get with it. The Sony 55-210mm is what I've been using but it lacks the reach and native teleconverters. ...
5
votes
3answers
617 views

Since it's not “focal length”, what is the term for the distance at which things are in focus?

I was under the impression that the “focal length” of a lens is the distance at which stuff appears in-focus. (E.g., perhaps I set the camera so that objects 3 meters away appear sharp, ...
0
votes
2answers
46 views

Nikon J1, takes pictures but they are all black, doesn't seem to “see” things, lens not the problem

I have a nikon J1, it has always worked well. Today I wanted to take a picture and the screen appeared black, like something was blocking the light completely or I was trying to take a picture of a ...
1
vote
3answers
226 views

I changed my camera lens while my camera was on [duplicate]

I changed my camera lens while it was switched on. It was my first time doing this because I usually switch off my camera and change the lens but this has been the first time I've changed the lens ...
3
votes
2answers
166 views

Cleaning stains left by frost from the front of a lens

I just returned from about 3 days of shooting at night when the temperatures would start around 50 F and would drop to 18 F leaving a frost on the ground. The lens hood did a decent job acting as a ...
1
vote
3answers
287 views

Why do so many old cameras have camera lenses made in Japan?

I'm browsing what the world has to offer me when I want to buy old (circa ’70s or ’80s) camera, e.g., a Canon EX Auto QL. And I've noticed that most of them have camera lenses made in Japan. Was Japan ...
5
votes
1answer
584 views

What is this large white Canon telephoto lens in a 1990 magazine ad for the EOS 1?

I am trying to identify this Canon Telephoto Lens seen on an ad at the back of an old copy of National geographic from Feb. 1990: I have tried to look for it on Google, but I can't find one that is ...
1
vote
1answer
47 views

Underwater protection for lenses

I've got a Sony A6000 camera and planning to get Nauticam underwater housing for it. I've noticed the box is often shown (in pictures, videos and such) with a lens, but I can't seem to find any ...
36
votes
3answers
3k views

How do I interpret an MTF Chart?

As part of how Canon (and other lens makers) give technical information about their lenses, they supply an MTF (Modulation Transfer Function) chart. How do I read and interpret what the chart is ...
8
votes
8answers
11k views

Nikkor f/1.8G 35mm or 50mm?

I'm new to photography. I got a Nikon D3100 with the 18-55 kit lens. I was looking to buy a f/1.8 prime lens, and I found two options: AF-S DX NIKKOR 35mm f/1.8G AF-S DX NIKKOR 50mm f/1.8G How ...
1
vote
1answer
245 views

Where to get replacement black sticker for the front of a lens?

On a recent trip the filter threads came loose on my Nikon 18-200, and some of the screws that held it in place where caught in the black sticker that covers them. I peeled off the sticker, and ...
1
vote
2answers
354 views

Does anyone have any information on Canon's VL mount regarding pinout and protocol?

I currently have a canon cl 8-120mm f/1.4-2.1 lens which uses the VL mount. Canon's goal appeared to have been to make this a standard system similar to the Micro Four Thirds system. See ...
0
votes
1answer
66 views

How do I calculate the field of view of a 50mm focal length biconvex lens with the retina as sensor?

Hi I need to know the field of view of a 50mm focal length lens. I know the field of view is dependent on focal length of the lens and the image format dimension (i.e., dimensions of the sensor). If ...
2
votes
2answers
104 views

How do universal clip-on iPhone lenses work?

So, recently I see a lot of clip-on Universal iPhone lenses like this (aliexpress link). I have a CCTV camera at home. It has a lens which looks like this from m12lenses.com. Can I clamp these iPhone ...
73
votes
11answers
5k views

How much do lens lineups vary across DSLR platforms?

I was reading this question and recalled how often I hear the advice "choose your lenses and then choose the body that matches" in the context of deciding on a camera platform ...
4
votes
4answers
398 views

Does the same focal length on the same camera always result in the same FOV?

I'm confused about whether the same focus length across different lenses on the same camera always produces the same Field of View. Some lenses are advertised as wide-angle and some are not. Is there ...
0
votes
3answers
8k views

Wide Angle Lens recommendation for canon 70D (cropped sensor camera) [closed]

I am interested in landscape and have a 40mm f/2.8 pancake lens but finding it does not capture enough and would like to purchase a Wide Angle lens. I am find ing the prices for the Canons too much ...
0
votes
4answers
6k views

What can cause black corners in an image?

There are completely black corners in some of my photos. What can cause it? I have a full-frame Canon 5D Mk II and had the problem with my 24-105 Canon lens recently and have experienced it with my ...
0
votes
1answer
813 views

Below which focal length are lenses considered to be wide angle?

Focal length is the only factor that decides whether a lens is described as being normal or wide angle. Below which focal length are lenses considered to be wide angle? Is this focal length the same ...
7
votes
2answers
2k views

Are all DSLR lenses made of glass?

This question is about lenses to "big" DSLRs, not system or compact cameras with interchangeable lens. Are all lenses made of glass in DSLR? And if not, is there a notable difference between: kit ...
-1
votes
3answers
152 views

Will L glass lenses compared to what I have upgrade my overall Image Quality?

I currently shoot with a Canon T5i and plan on upgrading to either a 6D or 7D Mark II (another topic). To go with my new body, I want a new lens. I currently have the following: 10-18mm f4.5-5.6 IS ...
9
votes
3answers
253 views

Why does a newer camera get lower score for a specific lens than an older one on dxomark?

I was looking around on DxOMark and found discrepancy in sharpness scores which seems very weird. The lens Olympus M. Zuiko Digital ED 12mm f2.0 has a sharpness score of "10 P-Mpix" when mounted on a ...
2
votes
1answer
118 views

Lens cleaner got into my camera lens

I used some glass lens cleaner spray on my pretty old (but still good) Samsung PL20 earlier this morning. I just turned it on to take a photo, and found this... It looks like somehow some of the ...
1
vote
0answers
48 views

Canon vs Sigma vs Tamron lenses? [duplicate]

Is there a significant quality difference between lenses made by Canon and those made by Sigma or Tamron? Specifically, I have been looking at the EF 300mm f/2.8L IS II USM: but if the Sigma or ...
0
votes
5answers
56 views

Nikon D3200 wide angle lens [closed]

For the Nikon D3200. As far as wide angle lenses go the prices seem to range from the $20 bracket on up to very expensive. I'm sure the higher end ones have a lot of good stuff going for them but if I ...
1
vote
3answers
620 views

What does a megapixel designation on a lens actually mean?

I know that in a CMOS sensor the megapixels give you an idea of how many pixels are actually there to capture the light. In terms of a lens however, I cannot find any relation between the megapixels ...
0
votes
3answers
124 views

Is my lens good for a tiger safari? [closed]

I have Nikon D5200 and Tamron SP AF 70-300mm F/4-5.6 Di VC. Is this lens good enough to cover shots?
1
vote
3answers
241 views

What is the sweet spot of the Canon's 18-55mm IS STM lens?

I'm plannning to photograph negative film like this. And I would like to know what would be the sweet spot of my lens to achieve best sharpness possible, what f stop and at what mm I should be ...
2
votes
1answer
177 views

Zoom lens “pops” around a certain focal length. What failure is my lens showing?

For a while my Sigma 18-50 f/2.8-4.5 lens has been shaking the viewfinder image once in a while. After asking a related question I settled for the explanation that it was the image stabilisation ...
1
vote
1answer
34 views

Which lenses can I use on my Sony Alpha 100? [duplicate]

I have a Sony Alpha 100 and I've bought an adapter M42 for it. I'd like to know, which lenses can I use on my Sony?
0
votes
3answers
58 views

Alternative lenses for 450d basic 18-55mm lens [duplicate]

I have Canon EOS 450d camera that I bought about 7 years ago and till now I have shot for about 15k photos. Lately appeared problems taking shots and when I pushed the button, nothing happened. I ...
2
votes
4answers
290 views

How does a 16-300mm f/3.5-6.3 lens differ from a 50mm f/1.8? [duplicate]

I have a Nikon camera. I received a Tamron 16-300 mm f/3.5-6.3 lens and a AF-S Nikkor 50 mm f/1.8G for Christmas. Do I need both? How do they differ in picture taking?
1
vote
2answers
149 views

Does Apple make its own lenses for iPhone cameras?

Does Apple make its own lenses for iPhone cameras? Or, does it at least design them? If not, does it source from a lens maker like Zeiss, or a camera maker like Canon?