Questions tagged [lens]

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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3answers
176 views

Does the autofocus system look through the lenses?

I have a doubt about the effect of putting a filter (polarizer, UV etc) on the autofocus system. In theory, a lens which is put in front of the lens will affect the focus (we must set a different ...
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2answers
239 views

What's the best choice of lens from an optics surplus shop to get a Stanhope Lens-like magnifying function?

I am looking to do some experiments with my cellphone and a lens, holding the lens in contact with my cellphone lens. I'm looking for a lens that has the shortest back focal length length possible, so ...
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1answer
405 views

Why does aperture change when I zoom my lens even in manual mode? [duplicate]

I have my Nikon D7500 set to Manual Mode. I can change the shutter speed and it maintains the setting. When I change the aperture, the setting is not maintained and varies depending on the zoom of ...
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1answer
2k views

Using a Sony E mount lens on a Nikon body? [duplicate]

I was just wondering if it's possible to use a Sony E mount lens on the Nikon D3200 by using an adaptor? I recently got given a Sony lens for free so I dont want to get rid of it.
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5answers
322 views

How to prevent lens cap from being put on backwards?

Today, I tried to take a picture with my wife's camera, and when I was done I went to put the lens cap on, but the outward part was facing the lens, and now the lens is scratched. Very, very expensive ...
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2answers
702 views

Why doesn't lens focus after turning focusing ring while set to autofocus?

My brother tried my new camera and was turning the focusing ring quite harshly on auto focus. (50mm canon lens) I’ve read multiple similar questions but nothing is quite what I mean. Ever since my ...
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2answers
125 views

What type of 3M vinyl should I use to protect the body of my lens? [closed]

I bought an expensive lens which I would like to aesthetically protect in order to keep its resale value high. This means that I want to minimize the chances of any scuffing, scraping, or scratching. ...
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1answer
121 views

What is behind this symmetric coma like effect, and literally odd-ball bokeh, in a triplet lens?

The example picture, shot with a vintage triplet (Staeble Kata 45mm/f2.8, wide open, on APS-C, no further crop), shows a curious shape of coma-like cross pattern in the right- and leftmost sculptures -...
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1answer
342 views

I have made the lens dirtier than before cleaning it. How can I recover from this? [duplicate]

After some testing, I determined that there was some dirt on my 18-50mm lens. Here is the photo of a white wall with my 18-55mm: You can see the settings of above photo here: Here is the same wall ...
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2answers
686 views

Kit lens on an Olympus OM-D E-M10 Mark II not being recognized?

I have an Olympus OM-D E-M10 with the kit lens, which reads Olympus 14-42mm 1:3.5-5.6 EZ ED MSC 0.2m/0.66ft-∞, and for some reason today, when I turn it on, the lens goes in and out (zoom) ...
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2answers
522 views

Is the Nikon AF Zoom-NIKKOR 80-200mm f/2.8D ED Lens a good Martial Arts lens for the Nikon D7500?

Let me try again. I am not sure how people know about the unpublished differences between lenses with the same specifications, or age/compatibility, due to my unfamiliarity with lenses and it seems ...
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1answer
98 views

Which Nikon DSLR and third-party lenses should I buy? [closed]

I was torn between the D5600, T6i, T7i, and D7500 bodies, but when I held the T7i and the D5600 the Nikon had a hugely better handfeel. There was no D7500 to hold and while it is faster I am leaning ...
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2answers
141 views

Blur image with a 1/2" lens on a 1/3" sensor

When I put my 1/2" lens on my 1/2" sensor, the image is perfect, but when I put the same lens on my 1/3" sensor, everything is very blur, even when I focus at maximum, so I need to put an extension ...
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2answers
101 views

Aperture and the understanding of how it works [duplicate]

So over black friday I bought this bundle, which is the Nikon D3500 two kit lenses. I was wondering, I keep hearing people talk about aperture and using F11-F16 but on those lenses that I have, all I ...
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1answer
305 views

How to perform lens shading correction given downsampled lens shading map

I'm working with the HDR+ Burst Photography Dataset. The burst RAW images are provided in DNG format. For each image, an additional low-resolution floating point lens shading map (encoded as .TIFF) is ...
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1answer
499 views

How to figure out the order of lens elements in the rear group?

I bought a second-hand Canon 100D after I got into photography this summer, and got to use a vintage lens that was still attached to my dad's Pentax ME Super (Asahi Pentax-M 50mm 1.4 SMC, a great step ...
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3answers
375 views

Reason for offset in lens/sensor and tripod mount?

I have noticed that my Canon Powershot G11 tripod mount is more in the center of the body of the camera and not aligned with the lens/sensor. Is there a reason for this? My concern is that as I rotate ...
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3answers
324 views

Lens for 1/2" sensors, installed on a 1/3" sensor

I want to install a lens built for sensors 1/x" (with 1 <= x <= 3), on a sensor 1/3". I need to have an horizontal field of view of "a cm", when my working distance is "b cm". What is the ...
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4answers
3k views

Is it safe to push a lens to retract it?

I have noticed. Instead of twisting the zoom ring on my 18-135 DX F3.5/ F5.6 G ED. I can instead push it to the camera to retract the lens using the lens hood as a "handle" How safe is this "...
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1answer
173 views

What is Canon RF control ring?

Canon RF lenses have a new feature: a control ring. What is the control ring and what can be done with it?
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3answers
746 views

Canon 100mm f/2.8L with raynox 250 diopter or canon 65mm mp-e?

I am having trouble deciding between these two lenses for insect photography. Please help me decide! Edit: I’ll be taking pictures of live insects using a flash with a soft light diffuser. I probably ...
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2answers
196 views

Will many tiny scratches on lens front element affect my photos? [duplicate]

I've bought a second hand Helios lens online (40 years old). At first sight everything looks fine no fungus haze no dust. Under 45 degree the front element in covered in very very thin scratches like ...
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1answer
73 views

Olloclip Macro 21x lens for iPhone able to shoot objects far away?

Can Olloclip Macro 21x lens for iPhone be used for shooting objects far away? (note: amateur in photography and lenses seeking help from experts)
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2answers
127 views

Emulate Shutter Duration on RAW Photos using Exposure Stacking

So I've been on this problem for about a year now and haven't been able to solve it. I gave up on it a while back, but now I'm researched up and ready to get an answer. I'm trying to fake a long ...
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3answers
818 views

Safety of storing camera resting on lens/resting on back?

I recently bought a Canon EF-S 55-250mm F4-5.6 IS STM for my Canon T7i. This lens is significantly heavier than previous lenses that I've owned and I'm concerned with how I can safely store the camera ...
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3answers
312 views

How to find out what part of image is less lens-distorted?

I'm developing an application which uses a Canon DSLR to sequentially shoot an object from different views. Often the object is too big to fit in frame so I have to make more than one series of photos....
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3answers
262 views

Is fungal growth still common with modern lenses?

I've been reading up on how to avoid fungal growth in camera lenses. I came across an article that suggested that fungal growth is uncommon in this modern time because the construction of lenses have ...
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5answers
3k views

What are the benefits of the classic f-number scheme?

Classic ƒ numbers are entrance pupil diameter as a fraction of focal length. This seems like a slightly strange choice as exposure is proportional to area rather than diameter. Naively I would think ...
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2answers
5k views

How do I choose between 24-105mm and 24-240mm zoom lenses for the Canon EOS R system? [closed]

After a couple of years with my first DSLR (a Canon T6), I’m thinking about joining the MILC world with the Canon RP (affordable, full-frame-sensor, mirrorless). I like to take pictures while ...
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1answer
107 views

Does my lens have lens corrections table for photoshop?

I have got my first DSLR, Nikon D80 and altough I am happy to get a DSLR with dual dials, pentaprism and best of all, CCD sensor but the lens that came with it has a problem. I have searched the net ...
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3answers
891 views

Using old FD lenses - are they better for EF mount or Micro 4/3s system?

I’m looking to buy a DSLR and I’m stuck between buying a Canon with an EF mount or a camera with Micro 4/3s. I have a good set of old Canon FD lenses (From a 28mm to a telephoto) that I’d like to use, ...
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1answer
226 views

AF Fine-tune zoom lenses?

How do you fix / fine-tune the focus on a zoom lens? Nikon states The D850 can fine-tune autofocus automatically. The results can be used with all lenses of the same type. But does it also mean ...
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2answers
2k views

Why doesn't the aperture change on a Nikon AF 50mm ƒ/1.8D lens? [duplicate]

I am facing problem with a Nikon AF 50mm ƒ/1.8 lens which is attached to a Nikon D7100. Although I can change the aperture from the camera (in M mode) it seems that it is not changing in photos. What ...
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2answers
189 views

How to know if a camera lens is for micro 4/3 cameras? [duplicate]

Hey guys I'm seeing this LUMIX G 42.5mm F1.7 ASPH lens but I'm not sure if it's for my micro 4/3 camera:
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1answer
465 views

Canon 50mm f/1.8 lens won't go down to f/1.8

Bought a 1.8 lens. Today on manual I realised it won't go down to f/1.8, the lowest is f/2.8, but on other modes it does. The camera is a Canon 5Ds. p.s - just moved to canon so is there a setting ...
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2answers
615 views

Why does my Sigma 10-20mm EX autofocus freeze up, and the camera won't shoot?

When using a Nikon D7100 and Sigma 10-20mm 1:4-5.6 EX DC HSM, the lens locks up or refuses to shoot. This lens doesn't have a Manual Focus or Autofocus button/switch. This lens is in brand new ...
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2answers
636 views

Canon APS-C Budget telephoto recommendation for Sports/Nature [closed]

I need a budget telephoto to use on my Canon 80D for sports and nature. It must replace my Tamron 18-400mm f/3.5-6.3 Di-ii Vc, which I find unconvenient because of its poor AF performance on telephoto ...
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2answers
161 views

What type of lens would I need for outdoor shots similar to the wide shots in this music video?

I am trying to find out what type of lens I need to get the shot that's in this music video. I am trying to shoot a video and I have a Canon Rebel T6i with the 18-55 kit lens. I want to be able to get ...
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5answers
4k views

Why can't my custom camera body focus to far distances?

I have built a custom optical device that uses a standard C-mount lens as found on CCTV cameras. Wikipedia states that the flange-to-film distance of a C-mount lens is 17.526 millimetres. I have ...
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3answers
258 views

Protective shell for Nikon 200-500 f5.6 lens?

The Nikon 200-500 f/5.6 lens has a zoom mechanism that makes the lens physically longer or shorter depending on the zoom level, but is there an enclosure that will accommodate the lens across its ...
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1answer
246 views

How different in quality is the Tamron 28-75 Di III compared to the 28-75 Di LD SP AF?

The "III" version, natively available in E mount and released in 2018, is almost twice the price of the older version available in various DSLR mounts. Has anyone here had the opportunity to compare ...
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2answers
262 views

What digital camera should I buy in order to use a Nikon Zoom-Nikkor 35-105mm f/:3.5-4.5 lens?

I have a Nikon Zoom-Nikkor 35-105MM 1:3.5-4.5 Lens f=35 and I'd like to know: which digital camera is compatible with this zoom? thank you lots, Giorgia
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1answer
85 views

What options do I have for very compact or pancake lenses for full frame Sony E cameras?

I love tiny lenses, but I haven't found anything that is smaller than the Samyang 35mm 2.8 that also covers full frame for Sony's E-Mount. Is there any option I have that could make an a7r2 jacket ...
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1answer
227 views

Back-focusing with Canon 7D2 body and Sigma 50mm art lens: is the Sigma USB dock the solution?

I just bought a second hand Sigma lens (50mm Art f/1.4) for my Canon 7D2 body (Mark II). This combination yields a very serious back-focus problem: With no micro-ajustements correction on my body, ...
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3answers
113 views

What techniques do higher-end lenses use to reduce astigmatism at high apertures?

I own a few lenses with a maximum aperture of f/2.8. For this question, I'll focus on two specifically: A Rokinon 14mm f/2.8, which retails around the $500 CAD mark; and A Sigma 24-70 f/2.8, which ...
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2answers
334 views

Is diffraction limited aperture independent of lens?

I have always understood diffraction limited aperture as a property of the camera and its sensor, not of the lens. The camera has a certain sensor size and a certain megapixel count, which together ...
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1answer
82 views

I have a Nikon D60 and two lenses: 70-300 and 18-135. Should I get a 50mm 1.8 prime? [closed]

I have a Nikon D60 and two lenses: a Tamron 70-300 mm f/4-5.6, and a Nikon 18-135 mm f/3.5-5.6. I got all of these things really cheap, and now I want to buy a prime lens. I was thinking about a 50 ...
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2answers
704 views

Nikon 24-85mm (non VR) vs. Nikon 28-70mm 3.5-4.5D

I currently own a Nikon 28-70mm 3.5-4.5D. I've enjoyed the lens and found it on eBay for $45 so it was a steal. From what I understand it was a great compact lens in the 90's that was a "kit" lens but ...
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2answers
499 views

Do mount adapters change the apparent focal lengths of lenses?

I have a Sony A6500 APS-C camera using a Sony 55-210mm lens. I wanted more reach so I rented a Sigma 18-300mm lens for Canon to use with a Sigma MC11 adapter. While testing this setup, I get the ...
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3answers
675 views

Tamron 100-400 (Canon EF) sharpness

I'm puzzled by how the results that "The Digital Picture" have received while testing the new Tamron 100-400 telephoto zoom lens contrast the positive reviews by the actual users all over the Internet....

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