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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.

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10 views

Nikon Lens: A (Auto-focus) vs. A/M (Auto-focus/Manual)

I have two lenses which are 18-140 VR and 50 1.8G. On the 18-140 VR I got a button showing A and M while on the 50 1.8 I got a button showing A/M and M. I understand that A is for auto-focus and M is ...
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2answers
63 views

Does a 35mm DX lens, mounted on a crop body, have the same field of view as a 35mm FX lens mounted on a full frame camera?

I know that when you use lenses made for full frame cameras on a APS-C camera, you should calculate the crop factor. E.g., a 35mm lens designed for a full frame camera mounted on a APS-C body should ...
3
votes
3answers
117 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 ...
1
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0answers
28 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 ...
4
votes
3answers
97 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
5answers
247 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 ...
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 ...
3
votes
2answers
456 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
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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
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.
1
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2answers
95 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
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 ...
2
votes
0answers
100 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
2answers
129 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. ...
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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 ...
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, ...
1
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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 ...
5
votes
1answer
585 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
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3answers
290 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 ...
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 ...
4
votes
4answers
399 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 ...
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
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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
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3answers
621 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 ...
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
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3answers
247 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 ...
0
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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?
0
votes
3answers
59 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 ...
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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 ...
1
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2answers
151 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?
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?
1
vote
1answer
160 views

Difference between Canon 18-135mm lenses

What is the difference between these two Canon lenses? Canon EF-S 18-135mm f/3.5-5.6 IS STM Canon EF-S 18-135mm f/3.5-5.6 IS
0
votes
1answer
102 views

Lens Focus Issues

I have been having focus issues with a Canon EF 24-70mm f/4L IS USM lens. It seems that it is unable to focus at infinity (or close to it)for most of the range between the wide and telephoto ends ...
3
votes
2answers
102 views

How do I choose a wide angle lens for my 700D?

I have Canon EOS 700D and want to buy a wide-angle lens. So far I was really impressed by the 10mm ones, however the ones with at least decent aperture comes without Image Stabilization. I also looked ...
2
votes
4answers
451 views

Does a full frame lens require more light on a crop body?

When using a full frame lens on a crop body, does the lens require more light? If I use an f/2.8 full frame lens on a crop body, does it become an f/4.2 (*1.5)?
1
vote
2answers
105 views

I've chosen to do abstract architectural shots for a portfolio: what type of lens should I buy?

I'm doing a final project at school and I've chosen to do abstract architectural shots, like the works of Andreas Gursky and Carlo Cafferini. I've got a Canon EOS 1100D and would like to buy a lens ...
2
votes
2answers
265 views

My lens's focus ring can be twisted past infinity and the close-focus stops without ever hitting a hard stop— is it defective?

I have a AF-S Nikkor 50mm 1:1.8 G lens which I use for my Nikon D3100 and D3300 cameras. Today, I noticed that the focus ring can be twisted past the infinity and 0.45m focus stops. It can be turned ...
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?
12
votes
3answers
1k views

How do zoom lenses restrict their widest aperture at the telephoto end?

Does the aperture ring lock the apertures beyond, say 5.6 at length lens's telephoto end? Does the lens introduce an obstacle to the aperture ring so the lens can't be opened anymore beyond the ...
2
votes
2answers
140 views

Why doesn't autofocus work after using manual focus for a while on my Nikon DSLR?

I bought a Nikon D3200 DSLR with 18-55 and 70-200mm lens. I was taking photos for week in autofocus mode, where I have to press shutter button halfway to focus. And then I switched to manual, where I ...
7
votes
3answers
131 views

How do I activate the shutter on a Schneider Kreuznach 135/3.5 Xenotar for Linhof?

I can not get the shutter of the Schneider Kreuznach 135/3.5 Xenotar to open. I tried to explain what I know in this picutre: Anyone any idea? I'm afraid I don't have a manual for the lens and ...
4
votes
5answers
433 views

What focal length is used in photos that both model is zoomed in and the background is open

It is easier to explain my question just by a sample photo from Lyndsey Adler: See the models are so big in the photo and still that big RV is also in the image. What focal length do I need for a ...
6
votes
4answers
417 views

How is actual focal length greater than focal range of lens?

This image (not shot by me) is shot using 70-300mm f/4.5-5.6 lens, but the EXIF shows the focal length to be 302 mm. How is it possible to be shot at a focal length (302 mm) greater than the ...
1
vote
1answer
68 views

What kind of microfibre cloth is the lens-wipe? [closed]

I wish to know what exactly is the microfibre cloth used to wipe lenses. How does one describe this material?
5
votes
6answers
310 views

What do the mm numbers on lenses mean?

I'm confused about lenses and numbers. Why are some lenses ex. 50mm-300mm Different sizes? Some lenses with the same mm numbers are huge and some are small... What's the difference? Also the prices ...
0
votes
3answers
133 views

Is autofocus important for ultra wide angle lenses?

I want to know if autofocus is important for ultra wide angle lenses, for casual users. I mean, users like my mom. I don't mind about manual focusing, but I suspect that wide angle lenses will focus ...
1
vote
1answer
141 views

Why doesn't my “Nikkor AF” lens autofocus on my Nikon D3300?

I recently got a new lens for my Nikon D3300. I now have 3 lenses; the other two that I have came with the camera and work great but when I put my new lens on, it will only manually focus. If I go to ...
0
votes
2answers
55 views

Why does my camera lens only work with a Polaroid .43x lens? [duplicate]

I got a brand new Canon Rebel T6i and along with it came an ef-s 18-55mm lens, and a Polaroid studio series .43x wide angle lens (which I believe is a telephoto lens). The camera worked fine, but ...
0
votes
1answer
50 views

Good Photographs with Moto G2 Camera [closed]

I have got a MOTO G2 Mobile with 8MP front camera, usually i get best shot from my phone but is there any way so that i can capture best pictures with a mobile camera everytime?