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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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9
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5answers
9k views

Why does my HTC cell phone lens appear so dirty, and how can I clean it?

My cell phone lens that looks dirty; or, I'm not even sure it qualifies as a lens — it's the transparent cover. See the photo below. I'm not sure if the lens was always like this or it happened at ...
1
vote
1answer
572 views

What is behind the mechanical issue with my Canon 70-300 lens? [closed]

Today I've realized my 70-300 zoom does not rotate fully. In fact, it stops just before the 300 sign is reached in the ring. There's some metallic noise inside the lens when I move it, which let me ...
0
votes
1answer
1k views

What is the EF 28 - 105 mm 1: 3.5-4.5 lens best for?

I've been shooting for about a year now and am slowly acquiring lenses. I just bought two used on craigslist from someone who was getting rid of equipment. Canon EF 28 - 105 mm 1: 3.5-4.5 Canon EF ...
6
votes
3answers
248 views

What is the influence of the camera on the performance of a lens?

Shouldn't a lens be good or bad independently of the camera it is used with? After seeing these reviews at DxOMark I got confused. By changing the camera where the lenses are tested I get different ...
2
votes
3answers
1k views

EF-S lens focal length [duplicate]

Possible Duplicate: Does my crop sensor camera actually turn my lenses into a longer focal length? If I have an EF-S lens with a focal length of 10mm on an APS-C camera (i.e. with sensor ...
3
votes
3answers
10k views

Why is my Nikon lens suddenly extremely dark?

I was going to take pictures of my daughter at the race track, and when I put my lens on my camera (as I have done several times before) this time it was very dark and didn't seem to work properly. I ...
2
votes
5answers
373 views

What to replace a mediocre Sigma 18-200mm with?

I'm thinking about options to replace my Sigma 18-200mm. I have a Canon T1i and a Canon 50mm f1.8. With the Sigma I wanted an "all round" solution, but as it turns out the lens is neither fast nor ...
15
votes
4answers
2k views

What is a parfocal lens and how beneficial is it to photography?

I heard someone say that after using a parfocal lens for the first time, they would never switch back. What is a parfocal lens, how is it different from any other lens, and what are the advantages and ...
5
votes
3answers
5k views

What does the millimeter measurement of a macro lens mean?

I understand that the millimeter measurement on a lens is, for lack of a better term, how far it can "zoom" in or out, but what about macro lenses? What does the millimeter measurement signify? How ...
6
votes
2answers
7k views

Is the difference between a good 50mm vs 85mm lens just your distance from the subject?

I was wondering: is the difference between a 50mm f/1.8 lens and a 85mm f/1.8 lens just your distance from the subject? Let's assume that distortion is minimal; both lenses are of high quality. Does ...
7
votes
5answers
2k views

What insurance options are available for rental lenses?

I am thinking about renting a couple for expensive lenses ($900+) from Adorama. I'll be visiting NYC from Chicago. They state on their rental page. We do not provide Insurance. We strongly ...
1
vote
1answer
728 views

Is a Tamron AF 28-300 F/3.5-6.3 with Canon 60D a wise choice for action photography?

I am considering buying a refurbished canon 60D and a Tamron AF 28-300 F/3.5-6.3XR lens. I take a lot of scenery but also fast action photography-dragracing etc. Is this a wise choice considering AF ...
29
votes
9answers
59k views

Why does fungus form in lenses, and how to get rid of it?

Recently I was using an old Pentax 50mm f/2 that had a quite big green spot, and later I was informed that it was a fungus. A couple of questions raised from this: Why does fungus form inside the ...
1
vote
1answer
534 views

Can the Tokina AT-X 165 PRO DX AF 16-50mm f/2.8 actually be found new, and how does it compare to the Canon EF-S 17-55mm f/2.8 IS USM?

I am having difficulties finding in-depth (Canon mount) reviews and comparisons for the Tokina AT-X 165 PRO DX AF 16-50mm f/2.8 lens. This lens is currently not sold on Adorama and B&H says that ...
2
votes
2answers
316 views

Which second-hand lens for under $1k would be best for taking pictures of distant birds?

I went on vacation with my Nikon 55-200mm f/4-5.6G lens. I did a lot of bird watching and whale watching. I had a lot more fun taking these types of pictures than I thought I would. I think I took ...
-3
votes
1answer
512 views

Which of these three prime lenses should I choose for my Canon 5D Mark II? [closed]

Which lens should I pick between the following, I'm after nice color / contrast: Leica 50mm f/2 Summicron-R Canon EF 50mm f/2.5 Macro Voigtländer 40mm f/2 Ultron SL II Anyone with experience with ...
5
votes
3answers
3k views

Which filters could I use with Sigma 8-16mm f/4.5-5.6?

I am very keen on purchasing the Sigma 8-16mm f/4.5-5.6 DC HSM lens, but one of the draw backs of this lens is that I can't put normal / standard filters on it. Can anyone please advise if I could ...
5
votes
4answers
4k views

How can I attach a lens without a collar to a tripod?

I have a Nikon 80-200 f/2.8 push-pull and I wonder how to use it on a tripod. There is no collar. What is the best solution to attach it to a tripod? ("Best" is rather vague, it should take into ...
3
votes
1answer
312 views

What adapter do I need to mount a Konica lens on an Olympus E-520?

I bought a Konica Super Albinar MC auto zoom 1:4.5 F=80-200 mm no. 911485 55 lens for my E-520 Olympus camera. The adapter I already have does not fit and I desperately need to know what kind of ...
4
votes
2answers
2k views

Why f/22 is the highest possible setting for the aperture diaphragm?

My first DSLR camera was Canon EOS 350D. Now I've got an upgrade to Nikon D90. Both were/are with the kit lens. Whenever I'm taking a picture with biggest zoom (55mm on Canon, 105mm on Nikon) the ...
0
votes
2answers
745 views

How do I choose a telephoto zoom lens? [closed]

I have a Canon 1100D kit (18-55mm IS II) and a 50mm f1.8 lens. Now I'm looking for a zoom lens. What do you think about the following: Tamron 18-200mm f3.5-6.3 Tamron 70-300mm f4-f5.6 DI LD Tamron ...
33
votes
4answers
22k views

What does the number of elements and groups in a lens mean?

All lens specifications include a statement of how many elements the lens contains, and in how many groups, for example: Nikon AF-S VR Zoom-NIKKOR 70-300 mm 1:4,5-5,6G: 17 elements in 12 groups (two ...
4
votes
7answers
591 views

Are there recent entry-level/prosumer DSLR cameras that can use/are compatible with high quality older manual lenses?

A reason to use older lenses is to save money on bigger zoom or other normally expensive auto-focus lenses. Is this still something people do?
0
votes
1answer
449 views

What does the “L” in the L-Series Canon lenses stand for? [duplicate]

Possible Duplicate: What is the difference between Canon “L” lenses and non-L lenses? Any ideas? Just curious. Some seem to think it stands for Luxury.
-1
votes
1answer
2k views

What does the F number in a lens name mean? [duplicate]

Possible Duplicate: What does the f-stop printed on the lens refer to? I understand that for a DSLR you can modify the aperture(the F number) to allow more or less light to enter the ...
0
votes
2answers
8k views

What do the lens parameter abbreviations mean? [duplicate]

Possible Duplicate: What do all those cryptic number and letter codes in a lens name mean? Canon EF 50mm f/1.8 II What does EF, II mean? Sigma 10mm/F2.8 EX DC Fisheye HSM compatibil ...
6
votes
5answers
910 views

Which one wide-medium lens to buy as the main lens for an outdoor wedding?

I have my first solo wedding gig coming up and I'd love recommendations for almost any lens (under $1500, preferably) to go on my 7D. My Sigma wide-angle is basically no longer usable. I have some ...
32
votes
8answers
5k views

Do I really need a fast 50mm lens?

Everyone I speak to says that a 50mm lens is the best and beats them all as an all-rounder. I was wondering whether to get myself a decent, fast 50mm as well. However I'm still not 100% sure whether I ...
5
votes
3answers
5k views

Why aren't there Tokina lens profiles in Lightroom, and how do I get one for mine?

I have a Nikon D90 and a Tokina 11-16mm. I want a lens profile for Adobe Lightroom, and it seems they have all known brands out of the box but Tokina. Why is that? How can I add a profile for my ...
4
votes
3answers
2k views

Do Nikon AF-S lenses perform better than AF lenses?

I am going to be getting a Nikon D7000 soon. I think I'm correct in assuming that the Nikon D7000 will use its own focus motor for an AF lens, but allow the lens to use its motor for an AF-S lens. ...
2
votes
1answer
592 views

How much difference is there between the Pentax DA 55-300 and FA 80-320?

I currently have a Pentax FA 80-320, and it's very nice to have a long zoom available. Lately, I've been considering "updating" to the DA 55-300. I also have the DA 50-200, so the lower end of the ...
5
votes
6answers
4k views

Between Nikon 18-55mm II and 50mm f/1.8, which suits my needs better?

I am an absolute beginner in serious photography. I'm a position to get a Nikon D70 body for $100 or so. I've been researching lenses and I'm debating if I should get the one that originally came ...
6
votes
4answers
13k views

Best portrait lens for canon 7d that gives beautiful bokeh?

I tried using the 70-200mm but I couldn't stand how heavy it was and how far away I had to be from the model! Opinions? I was thinking between 85mm 1.2 or 50mm 1.2 ....or another lens? Any help ...
3
votes
3answers
750 views

Which would be more suitable lens in terms of utility, weight, price: 18-135 or 18-55 + 55-200?

Is it better to invest in one 18-135mm lens or have a standard 18-55mm lens and another 55-250mm lens for occasional need?
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2answers
656 views

How do I decide the best aperture to use with my Canon 18-200mm lens and 50D?

I am using a Canon 50D with the 18-200mm lens it came with. Some of my pictures turn out un-sharp, even taking metering and Auto Focus points into consideration. I wonder if this is caused by my ...
10
votes
3answers
5k views

How do I know if a lens is genuine?

I'm in Times Square shooting the Imagine Cup event, and several people said that to fix my shot, I would need a faster lens. Just for the hell of it, I went across the street to a photo shop to see if ...
16
votes
2answers
3k views

Why do zoom lenses and compact cameras have varied maximum aperture across the zoom range?

Why does a camera's maximum (allowed) aperture get smaller when you increase its zoom?
2
votes
3answers
224 views

Where should one go in terms of equipment for event shooting after a D7000 kit?

I'm still new at photography -- really, it is going to be a long while before I can get close to the potential out of the D7000 kit. However, Microsoft recently has been giving me the opportunity to ...
5
votes
4answers
4k views

How do Canon EF 100mm f/2.8 and EF-S 60mm f/2.8 macro lenses compare?

I've read over a few of the macro posts on this site, and I'm very new to digital photography, so I have a few questions, and some may be overlapping. I have a Canon EOS Rebel T3, and I want to buy a ...
3
votes
3answers
1k views

How do I choose a zoom lens for my Canon DSLR when I'm ready to move beyond the kit lens?

I am using Canon 500D with the kit lens (18-55). I think I have done enough with 18-55 and want to try out next lens. I have already decided to purchase 50mm prime. I also wanted to get a Zoom lens. ...
4
votes
4answers
3k views

Best all-around ~$600 standard zoom lens for Canon? [closed]

I have a Rebel T2i, I was wondering what standard zoom lens is the best around $600. I'm mainly shooting landscapes / cities / peoples. I've done some research and came up with 17-50, 18-55 from ...
1
vote
1answer
851 views

Olympus T2 Adapter ring stuck on my Sony Alpha — how can I get it unstuck?

Edited. I bought a Samyang 500mm Mirror lens off ebay so that i could try and expirement with tele photos before i decided to buy really expensive lenses.. I got the lens with a T2 Adapter (Olympus) ...
4
votes
2answers
971 views

Are there reasons beyond weight and price to choose the Olympus 40-150mm over the 14-150mm?

I'm curious whether there is any advantage in buying the 40-150 vs. the 14-150 lens. Both are f/4.0-5.6 and quality seems to be the same. Is there any reason except weight and price for which one ...
41
votes
7answers
171k views

How do I convert lens focal length (mm) to x-times optical zoom?

What is the rule to convert the 'mm' notation to the 'optical zoom' notation? I searched a bit and found this one: optical zoom = maximum focal length / minimum focal length For example a 18-55mm ...
5
votes
2answers
982 views

What's the base f-stop when counting an ideal f-stop for lens?

I've read a lot around this site that an ideal quality of the lens is achieved when using f-stop roughly 2 stops slower than the fastest value of the lens. Firstly, I'm not exactly sure what "2 ...
0
votes
6answers
303 views

Help me with information to take a lens purchase decision

After quite a time I have made my mind to buy a DSLR and I am thinking for Canon 550D. Though question is long I could not find way to shorten this. As a starter I would like to stick and learn with ...
12
votes
5answers
5k views

What is a portrait lens?

I hear this term used pretty often. Does it refer to a specific focal length? Or very low F-number? What does a lens need to have in order to be considered "portrait lens"?
21
votes
12answers
32k views

How do I get a stuck screw filter off of my lens?

There is a UV-filter screwed on my Canon 16-35mm. For some reason, I'm not able to get it off the lens. Does anyone has a simple but safe trick?
20
votes
4answers
4k views

What is a “fast” lens?

I've been reading lots of camera reviews lately and have ran across several references to "fast" lenses. What exactly is a fast lens and what are its advantages compared to other lenses?
4
votes
2answers
3k views

If I have a 28mm f/1.8 lens (on a crop body), do I still need the 50mm f/1.4?

I have the Canon 60D and a Canon 400D (my original camera). I have two lenses a Sigma 50mm 1.4 HSM and a Canon 28mm 1.8 USM. Both lenses are incredible performers. I've noticed the bokeh I receive on ...