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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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5answers
84 views

Why Nikon announced S-Line lenses with narrow apertures first?

Some time ago I saw the Nikon's roadmap for new S-Line lenses and today I found an update to this roadmap. I am wondering why Nikon is building lenses with those apertures first, is it a market ...
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3answers
95 views

Which lens is best for athletics?

So 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 ...
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2answers
92 views

What are the pros and cons of using enlarger lenses for general photography?

Enlarger lenses seem to be available for very little cost. What are the pros and cons of using enlarger lenses for general photography?
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2answers
439 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 ...
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1answer
284 views

Can anyone help identifying this (close-up or what) lens?

T-mount on one side and something strange (similar to Arri PL? on the other)?
2
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1answer
96 views

What are the differences between projector, enlarger, and macro lenses for photographing 35mm slides?

I have some 35mm slides that I would like to digitalize. I am thinking about building something like this (modifying a slide projector to feed the slides and mounting a dslr to photograph the slide ...
2
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1answer
275 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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1answer
791 views

How can I remove a piece of dirt from inside the lens system of a compact camera?

Background I have a Panasonic Lumix compact camera, which, out of nowhere caught some piece of dirt between the lenses or on the sensor. I ensured that it was not on the outside of the lens. When ...
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1answer
535 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 ...
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1answer
79 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 ...
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1answer
156 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 ...
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0answers
480 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 ...
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0answers
311 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
52 views

Are there any good resources that provides information about the focus breathing of various lenses?

Sites like DxOMark provides a lot of information about lenses but they generally don't provide any really usable information about the focus breathing protperties of the lenses. In fact I don't know a ...
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0answers
48 views

How to identify the original manufacturer of lenses branded JCPenney?

There are JCPenney branded lenses for which I wish to identify the manufacturer. How can I do so? It appears to have been common for redistributors to have encoded the manufacturer in the serial or ...
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0answers
27 views

How to identify the original manufacturer of lenses branded Focal (Kmart)?

There are Focal-branded lenses for which I wish to identify the manufacturer. I have read that Focal is the Kmart house brand for optical equipment (cameras, lenses, binoculars, etc). They also ...
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0answers
42 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 ...
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0answers
46 views

M12 cut IR filter quality?

I want to get a few quality filters for M12 type dash camera from China, however I know nothing about filters so need someone to tell me how/what to order? Is the barrel on M12 lenses the same ...
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0answers
80 views

What are the upper and lower limits of torque to safely operate a geared cinema lens?

I'm prototyping a stepper motor drive for cinema lenses. The idea is to mount a 32 pitch spur gear on a stepper motor shaft with an encoder. That assembly will turn the focus, iris, or zoom ring gears ...
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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: ...
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0answers
72 views

Noise at Low ISO

Hi I use a Canon 80D with zoom lenses Tokina 11-16 Canon kit lens- 18-135 I usually get noise on people's faces. I capture at Low ISO, even in daylight at times. I can't figure out why. Could ...
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0answers
30 views

AF not working, need help

so a few days ago i dropped my 18-135 cannon lens (yup, bed). I was pretty sure the lens need repair, because it wouldn't AF. MF is working. However I tried using the lens on an another camera and it ...
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0answers
42 views

My nikon d5300 camera won't take a photo nor will it focus?

I got my camera for Christmas (couple of days ago) and it was running fine! The focus was amazing etc. Then all of a sudden today, it won't focus. When i half shut the shutter, a noise is created (...