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Tagged Questions

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.

learn more… | top users | synonyms (1)

12
votes
8answers
4k views

How do I choose a macro lens for a Canon APS-C camera?

I have a Canon 40D and like taking macro shots sometimes, so I'm thinking of buying a macro lens. I'd also like the lens to double up as a portrait lens. I'm not a super serious photographer, so my ...
33
votes
10answers
8k views

Which focal-length lens is usually used for portrait photography, and why?

What focal length or range of focal lengths are usually used for portraits? What is used by professionals? Why would one select a certain focal length? What are the advantages and disadvantages of ...
29
votes
4answers
42k views

What is back-focusing?

What is back-focusing? Is it something I need to be worried about, or can I just live with it? How can I tell if my camera/lens is sufferring from it?
8
votes
2answers
310 views

Are there any downsides in using 2x extenders?

What are the negatives with using teleconverters?
36
votes
4answers
2k views

Should I get DX for my APS-C camera, or FX lenses in case I upgrade to full-frame in the future?

I recently bought a Nikon D90 camera body, which has a "DX" APS-C-sized sensor.. Within the same budget, should I go with DX lenses or should I get full frame lenses in case I upgrade to a full frame ...
21
votes
0answers
573 views

Is Image Stabilization better in the lens or the body? [duplicate]

Possible Duplicate: What is the difference between in-lens image stabilizing and in-sensor image stabilizing? Some DSLR manufacturers have image stabilization (IS) in the body of their ...
17
votes
5answers
1k views

How does a circular lens produce rectangular shots?

Is it something like the sensor captures a circular image and then what we get is the cropped version? Something like this: Or did I get it completely wrong?
28
votes
12answers
7k views

Should I buy a camera with kit lens, or body plus lens separately?

I am planning to buy a DSLR soon. Before I zero in on the model, I want to know whether it is advisable to buy a kit (body + 18-55 lens) or not? OR should I go for the camera-body and the lens ...
12
votes
4answers
4k views

How can a lens like a 18-55mm have more than one focal length?

How can a lens have a range of focal lengths? Shouldn't it be a single number? Isn't focal length supposed to be fixed for a lens of a particular shape and geometry? What am I missing? How many ...
11
votes
2answers
555 views

Are there any downsides to buying a third party extension tubes for Canon?

I would like to get a little higher magnification out of my Canon 100mm Macro, so I am looking at extension tubes. I know Canon makes the EF25, but it seems pretty expensive considering there isn't ...
10
votes
6answers
2k views

How to select lenses for sports photography?

I would like to get into sports photography, and would probably want a better telephoto lens so I can get better close up shots. What other factors should I keep in mind as I make my choice? Does IS ...
9
votes
5answers
4k views

Which lens is sharper? The Sigma 18-50mm f2.8 or the Tamron 17-50mm f2.8?

Specifically: Sigma 18-50mm f/2.8 EX DC Macro (not the previous non-macro version. HSM is only on Nikon fit) Vs. Tamron 17-50mm f2.8 SP XR Di II LD VC Lens (not the cheaper one without vibration ...
120
votes
3answers
39k views

What do all those cryptic number and letter codes in a lens name mean?

Then looking at a lens name there is a lot of acronyms in the name describing it's features (often specific to the manufacturer). Examples, Nikon: Nikon AF-S DX 16-85mm VR f/3.5-5.6G IF-ED Nikon ...
10
votes
3answers
3k views

How many optical aberration types are there in lenses? And what are they?

Everyone hears something about chromatic aberration but are there any other types? What causes them?
10
votes
8answers
3k views

For greater telephoto range, should I use 70-200mm + teleconverter or a longer zoom lens?

Right now, I have a Nikon 18-200mm f/3.5-f/5.6 VR lens. I like it, but want more telephoto range and would also like to be able to use faster shutter speeds. I am interested in the 70-200mm f/2.8, but ...
7
votes
5answers
1k views

Are third-party alternatives to the Canon 70-200 f/2.8 worth the price savings?

Has anyone used the 3rd party 70-200 lenses? Are you happy with the quality, or do you wish you had saved up for longer and got the Canon?
14
votes
11answers
5k views

Which macro lens would you recommend for a full frame Nikon camera?

I use a full frame Nikon camera and would love to play with macro photography. Is the Nikon 105 macro strong enough or would you rather recommend some bigger third party lens?
10
votes
9answers
20k views

What lenses are must-have yet affordable for a Canon T2i camera?

I have a canon T2i camera. I am beginner looking for some tips on the best lenses to carry around.
17
votes
5answers
716 views

What is an ultra-wide lens?

What is the point at which a lens is considered "ultra-wide angle" vs just wide angle?
25
votes
6answers
4k views

Can I damage the focus system by turning the focus ring when the lens isn't mounted?

I have a couple lenses that don't have an internal focusing system, and whenever I want to put them back in my bag, I turn the focus ring to make the lens shorter. I noticed that when the lens is set ...
21
votes
6answers
922 views

Should I be worried about getting dust inside my SLR?

I recently went to Silverstone to watch the F1 qualifying and took my DSLR camera with me. Throughout the day, I switched lenses a few times, but each time was very conscious that there was a lot of ...
26
votes
9answers
1k views

Are Sigma lenses comparable to Canon lenses for a Canon camera?

I always feel that I should buy a Canon lens for my Canon camera, and Sigma would just be a cheap knock-off. Is that the case?
14
votes
3answers
481 views

What is Chromatic Aberration?

What is Chromatic Aberration? Is it a physical part of the lens, or just an optical illusion?
16
votes
13answers
1k views

What's an excellent walkabout lens?

(Happy to keep the question general, but personally interested in Canon fit) I've got a Sigma 18-125 that's served me well, but the image quality isn't stellar, it's unstabilised, max f3.5, and focus ...
19
votes
4answers
749 views

What should I consider when purchasing a macro lens?

What should I be aware of when buying a macro lens (other than that it will fit my camera)? What features should I look for? What specs should I pay close attention to? What factors affect macro ...
21
votes
2answers
869 views

Considerations when purchasing a prime lens?

What should I be aware of when buying a prime lens (other than that it will fit my camera)? What specs should I pay close attention to?
10
votes
4answers
289 views

What are important considerations when purchasing a zoom lens?

What should I be aware of when buying a zoom lens (other than that it will fit my camera)? What specs should I pay close attention to?
16
votes
6answers
2k views

Which scenarios are better shot with a prime lens versus zoom lens or macro lens?

What scenarios are better shot with a prime lens? A zoom lens? A macro lens?
8
votes
5answers
4k views

What CCTV lenses can I use with Micro 4/3 and adapter?

I keep hearing things about using CCTV C Mounts hacked into a Micro 4/3 camera using an adapter. Does anybody have any experience with this? Can any ebay lens work, or is the C-mount not universal? ...
11
votes
1answer
870 views

How can you tell if a lens is having problems with back focusing?

I recently bought a Canon EF 24-70/2.8L to use with my 450D and I suspect that it is constantly back focusing. Is there any way of determining if it is something wrong with the lens or if it is a ...
6
votes
0answers
359 views

How do I avoid getting any chromatic aberration in my photographs?

Another question is how to correct it (suggested in proposals), but ... are there ways of avoiding it in the first place?
56
votes
10answers
5k views

Are there any downsides to using a good-quality UV filter?

Are there any real downsides to using a UV filter? I know that a poor quality UV filter can effect image quality ... but, assuming I use a good quality UV filter, will that actually be an issue? Is ...
60
votes
11answers
23k views

Is there a noticeable difference between 1.8 and 1.4 prime lenses?

I have been shopping around for a prime lens for my Nikon D50. I noticed that the 1.8 is hundreds of dollars cheaper than the 1.4 AF-S. What will I gain for that cost difference? Is it really ...
19
votes
8answers
1k views

Should I really lug around a lens cap everywhere?

I lose lens caps by the billion. Is there another way to protect my lenses without having to carry these things around with me?