The Stack Overflow podcast is back! Listen to an interview with our new CEO.

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.

25 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3
votes
1answer
103 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 ...
2
votes
1answer
173 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
votes
0answers
397 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
votes
0answers
615 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
votes
1answer
285 views

How to fix balsam separation?

How can balsam separation between glued elements be fixed? I'm planning to try to fix a couple lenses because what else am I going to do with them? It's about looking nice, optimizing image quality, ...
2
votes
1answer
438 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
vote
1answer
95 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 ...
1
vote
0answers
69 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
vote
0answers
37 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
vote
0answers
129 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 ...
1
vote
0answers
79 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
vote
4answers
202 views

Which lens is best for athletics?

I am an athletics photographer, and I have a dilemma. First off, I use the 5D Mark II body. Currently, I own the 100-400mm f/4.5-5.6 USM II, and I LOVE it... except for indoor photos. Before I ...
1
vote
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
662 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
votes
0answers
19 views

How to determine diffraction limited MTF at a given contrast?

Tables and formulas to determine the "extinction"/"zero contrast" MTF in lp/mm at a given aperture, for a diffraction limited system, are well known. How to determine the theoretical maximum MTF, at ...
0
votes
3answers
75 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 ...
0
votes
2answers
95 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 ...
0
votes
2answers
116 views

What are the distinguishing features of various Sony mirrorless camera models?

I am not a professional photographer and it is basically my hobby. I would like to buy a mirrorless camera and I have thought to get Sony a6000. Most of the time I take pictures of landscape and ...
0
votes
1answer
39 views

How does registration distance affect lens distortion and aberration correction?

If I use a lens with an extension tube, how does changing the distance between the lens and camera affect optical correction of distortion and aberration via glass elements (as opposed to digital ...
0
votes
1answer
81 views

How can I tell whether or not a lens has focus breathing?

So recently I got a 90mm macro lens, installed a focus bracketing app onto my camera and let it run. Unfortunately, turned out that this lens has focus breathing which means the actual zoom level in ...
0
votes
1answer
111 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
votes
1answer
171 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
votes
1answer
116 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
votes
1answer
106 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
votes
2answers
461 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 ...