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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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3answers
108 views

How do I rig up a color filter for my Sigma 8-16mm Ultrawide?

I am a bit confused... I'm not sure if the cokin system will work on my lens, as my lens doesn't have threads for a filter. I've found that placing a Z series cokin filter in front of the lens will ...
3
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3answers
335 views

What can I do when autofocus suddenly starts blocking at around 2m on a Nikkor AF-S 28-70mm 1:2.8 D?

I had this lens for quite a few years now, it used to work as expected. I didn't use my stuff for a few months, maybe 6-8 months. I just bought a D600 and tried to use them. The AF does not work as it ...
3
votes
2answers
64 views

How do zoom, magnification, and focal length relate?

Zoom lenses and cameras with superzooms are often sold with an × zoom number — like a 12x zoom or 30x zoom. The question How do I convert lens focal length (mm) to x-times optical zoom? explains how ...
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2answers
98 views

Why can lenses only focus from so close?

I have always wondered, why is it that a lens can only focus from so far away from the subject? I know some lenses have a kind of macro switch which basically allows them to focus closer but why are ...
2
votes
1answer
120 views

Nikon 16-85 VR focus noise problem?

My 16-85 VR is doing some weird noise during focus, manual or auto. It's like an hiss. I asked in a local shop and they said it can be some microdust inside the lens. But I'm a little worried it can ...
2
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0answers
82 views

How can I fix a Nikon DX 18-135mm with an aperture stuck open?

I am currently on a trip and I brought an 18-135mm lens and a 35mm prime as my two lenses for the trip. When I took my zoom out of my backpack off the plane and put it on my camera, I immediately ...
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0answers
41 views

Missing Grommet on lens that secures lens cover

I have a Canon Power Shot SX500 IS with a Canon Zoom Lens 30 x IS. The grommet located in the inside lip at end of the lens fell out and was lost. It secures the lens cover when in use. Where can I ...
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0answers
39 views

What kind of chromatic correction has the Pentax M 50mm f/1.7

http://www.kenrockwell.com/pentax/35mm/lenses/50mm-f17-smc-m.htm After the chromatic aberrations that I observe, it could be an achromat.
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0answers
53 views

Bayonet mount adapter

I am planning to buy a Vivitar lens with a 58mm bayonet mount. I need to fit it to a 58mm screw fixing. Can I get a adapter to do this? If so, where and what is it called?
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0answers
31 views

How to accurately calculate size in image using relations and a reference

OK so the relation math is easy enough. If you know the size of an object, say a 12" ruler in the image, and you put the ruler flat against another object like a door. You take a picture of the door ...
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0answers
160 views

Will an adapter tube for a Fujifilm Finepix S4500 fit a Finepix S4830?

I have the s4830 camera and was looking into getting a lens adapter tube, but I can only find one for certain models, including the s4500. Would an adapter tube meant for the s4500 fit my camera as ...
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0answers
168 views

Where can I find a service manual for Tamron AF 28-300mm f/3.5-6.3 XR LD Aspherical Macro Zoom Lens (for Nikon)?

I'm a photographer from Sri Lanka. I disassembled my Tamron AF 28-300mm f/3.5-6.3 XR LD Aspherical Macro Zoom Lens (for Nikon) to clean it myself. But now, it's difficult for me to reassemble it. I ...
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0answers
129 views

Why does my Canon Powershot A3300 IS lens cover sometimes remain shut?

When I put on the camera, although the lens extends out, it takes a while to open and sometimes does not open and any photo taken comes black because the lens is shut! Its a huge disappointment ...