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.

27 questions with no upvoted or accepted answers
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7
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2answers
204 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 ...
3
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1answer
130 views

What part of Canon 50mm f1.4 is responsible for failure to autofocus?

I have the Canon 50mm f1.4 which had the common focus issue due to deformed inner focus ring. I have straightened the ring and the lens now had full range of manual focus, but Autofocus cannot find a ...
3
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2answers
268 views

How can I do 4x5 rise/fall movements with super wide angle lenses?

I'm looking for super wide angle lenses, ideally 50mm and below. I'm only interested about decent rise/fall movements because I do mostly architecture, and I'd like to be very close to the subject. ...
2
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0answers
261 views

What type of lens do I need to build a ciné film scanner

I want to build a scanner to digitise standard 8mm ciné film using my Eumig 8mm projector and a Raspberry Pi with the High Quality camera module. I am not too worried about the mechanical, electronics ...
2
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0answers
438 views

What are the different types of auto-focus motor and how do they compare?

What is the difference of ultrasonic motor, stepper motor, and electromagnetic drive? Which one of these are lens-based or screwdrive? What are the advantages of lens-based servo over screwdrive and ...
2
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0answers
707 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 ...
2
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1answer
553 views

Why is my Nikon 18-300 lens not focusing at higher focal lengths?

I found a similar question about the 18-200. Someone suggested screwing the front element tighter. Is it possible to do the same with the 18-300? My problem happens at 200-300mm. I am not sure how to ...
1
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0answers
98 views

What is a better lens for Mirrorless camera? EF-M 55-200 mm vs EF-S 55-250 mm with adapter

I just ordered the EF-M 55-200 mm. I was looking only for lens directly for M, but after I made the order I also checked the EF-S / EF lenses and I found that they are probably better like 55-250 mm, ...
1
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0answers
73 views

Lens stuck on enlarger board/mount

I have a LPL VC7700 VCCE 6x7 enlarger with two Nikon El-Nikkor lenses (50 and 80) that I could easily interchange up until yesterday. Now the 80mm lens is stuck on the lensboard : when I try and ...
1
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0answers
28 views

Angenieux 6-80mm Super 8 lens “40/80” knob

I'm new to the world of film. My Beaulieu 5008-s came with the Angenieux 6-80mm f/1.2 lens. About half way up the barrel there is a small knob engraved with "40" along the edge and "80" directly ...
1
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1answer
148 views

What is the mount on this Sigma lens? It is smaller than Canon EF

I just got a SIGMA 17-70 1:2:8-4 DC (C) lense. Mount looks very much like Canon EF (S) but it's smaller. Added a foto from a 70-200 EF to compare. Anybody knows what this mount is for? Many thanks in ...
1
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1answer
214 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) ...
1
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1answer
258 views

What should I do when my D3400 aperture is stuck no matter what lens I use?

I have a D3400 and recently I haven't been able to change the aperture on any of my lenses in manual mode. I have lenses with aperture rings and if I set the aperture to anything below the largest ...
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0answers
295 views

Fujifilm Instax mini 90 lens cover won’t close

My mini 90 neo classic camera lens cover won’t close when turned off. Please help To note: took it to the beach to take some pictures and there was a storm happening and lots of sand was blowing ...
1
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0answers
43 views

Can I adapt my 38mm auxillary lens microscope to use more widely available 42mm ones?

I have a Bausch and Lomb/Leica StereoZoom 4 microscope that I would like to use for microsoldering and occastional photos. Unfortunately, it only has 10X eye pieces and no auxillary lenses or ...
1
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0answers
142 views

Using Nikon PS-4 bellows to copy 35mm negs

I want to digitize my old b&w negs, and have an old PS-4 bellows unit to use on my Nikon D5200, an SLR with a DX format sensor. My PS-4 manual predates DX, and shows a table with lenses from 20mm ...
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0answers
106 views

What are the underlying causes of artifacts seen with anamorphic lenses?

When a camera with an anamorphic lens shows some artifacts, they are usually either an oval bokeh (vertical) or a lens-flare steak (horizontal). How much of these artifacts are due to the "anamorphic ...
1
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0answers
3k views

What is the impact of changes between the old and new Nikon 18-300mm lens?

The lenses I am considering are: Nikon AF-S DX NIKKOR 18-300mm f/3.5-6.3G ED VR Lens (new) Nikon AF-S DX NIKKOR 18-300mm f/3.5-5.6G ED VR Lens (old) As far as I can tell the only differences are: ...
1
vote
1answer
872 views

Camera showing incorrect used focal length in EXIF data

Using a Canon 5D Mk2 with a 17-40mm f/4L lens. Everything seems to work just fine, except no matter how i shoot, the EXIF-data will show 40mm as the used focal length, even if I know the image is ...
0
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4answers
312 views

What image will I get if I attached a DSLR lens to an iPhone sensor?

As we all know, we will get a cropped image when we use the same lens on FF and APS-C. The image is kind of zoomed-in. THe image quality of the two images would depends on the sensor quality. If I ...
0
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0answers
83 views

Would you consider this lens (Samyang 8mm CS II) defective?

I purchased a new Samyang 8mm F3.5 UMC Fish-eye CS II today. After I made my first shot with it I immediately noticed a flaw. At f/3.5 the flare of bright objects is shifted towards the bottom (and ...
0
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1answer
77 views

Canon Powershot SX260 HS problem

The camera was in my handbag along with a bottle of water that I THOUGHT was tightly closed, but instead was dripping. Now the camera will not start without removing and re-inserting the rechargeable ...
0
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1answer
189 views

Can I reattatch the parts of my Canon 50mm f/1.8 lens which broke in a fall, without further disassembly?

The upper part of my Canon EF 50mm f/1.8 II Lens is separated from the lens body due to a fall. One of its 4 lugs has broken off. Can I still attach the upper and the lower parts without ...
0
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1answer
186 views

Why does my adapted f/2.8 lens make very dark images in manual and action mode?

I'm using a Sony A7 II with adapter with a Canon EF 24-70mm f/2.8L and a Canon 16-35mm f/2.8L both with the same settings, but the exposure on the 24-70mm is darker in the manual and action modes, but ...
-1
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1answer
127 views

Lens recommendation for tiger photography

I am planning to take a photography tour in India to photograph tiger and other animals. What lens would be recommended for such purpose? I am canon user and have 5d mk iv with 100-400 IS I. I have ...
-1
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1answer
113 views

Stuck lens off - scared to reattach another lens

I managed to get my 50mm lens off my camera (it was stuck) and it looks like one of the lens pins was broken. I'm scared to reattach another lens. Was it the camera body that was making the lens stuck ...
-1
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2answers
474 views

Projector Design and lenses

I am working on a project where I need to project a single image onto an object, Originally I was looking at the digital projector route but due to cost and complexity this has been ruled out. I found ...