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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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Why does the max aperture change when use Nikon 60mm AF-D Micro on D90 camera?

I have found that my Nikon 60mm Micro AF-D changes aperture from 2.8 to 3.2 when used with a D90. I have tried both A and M mode. Is it by design? Why? I intend to buy Nikon 50mm 1.4 AF-D, but it ...
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1answer
1k views

Does maximum aperture change with focus distance with the Canon 60mm f/2.8 macro lens?

This site says The Canon EF-S 60mm f/2.8 Macro USM Lens loses 1/2 stop at 1:5, 1 stop at 1:3, 1.5 stops at 1:1.5 and 2 stops at 1:1 (lifesize). Can anyone confirm that at 1:5 magnification, ...
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4answers
4k views

Why am I getting soft images with my Sigma 24-70 f2.8?

I recently purchased a Sigma 24-70mm f2.8 lens which I am using on a Canon 40D body. Around 8 of 10 shots were soft, regardless of subject matter. Exposure, white balance etc. all looks fine. I only ...
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1answer
196 views

At what point does wind become a concern with respect to damaging a lens?

Another question on here revealed the dangers of photography in a desert environment. What about windy places? Is there a wind speed after which you risk lens damage from particulate impact? I don't ...
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2answers
3k views

What lens for my Nikon D3100 will provide great bokeh and keep up with fast-moving kids?

I have a Nikon D3100. I'm trying to buy a lens that will mainly take outside pictures of kids with great bokeh. I can't decide between 35, 50, or 85mm. I'm worried about autofocus as well. With ...
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3answers
2k views

What type of lens will auto-focus on Nikon bodies without a focus motor?

I know my D40 doesn't have a motor in it to auto-focus lenses. What type of lens has the motor in it? How can I know which lenses will and will not work?
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1answer
426 views

Has anyone used the LensCoat for the Canon EF 100-400mm L zoom lens?

I've been getting more into bird photography lately, and sometimes that involves tromping through some deep grasses, brambles, thick woods, etc. I'd like to protect my lens, and keep its resale value ...
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2answers
3k views

DX 35mm vs FX 50mm

Will the picture taken from AF-S DX NIKKOR 35mm f/1.8G and AF-NIKKOR 50mm f/1.8G be one and the same because of the DX and FX format??
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1answer
1k views

What might cause stuck focus on a manual lens?

So, today I dropped my ME Super. When I picked it up I realized that the focus ring of the 50mm f2 lens attached didnt turn. My question is, what could cause this? Could it be that the threads inside ...
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1answer
1k views

What 3D lenses are available for a Sony NEX camera?

I currently have a Sony NEX-VG10. I would like to know if it's possible or worthwhile to get a 3D lens for it? I did a google search and can't seem to find any — or am I blind?
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1answer
8k views

How do lens prices compare for Nikon and Canon?

I am about to buy a new DSLR and shortlisted the two models, Nikon D5100 and Canon 550D. I ready to buy the Nikon model(more expensive) but learned that Nikon lenses are much more expensive than Canon ...
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3answers
5k views

Does change of lens affect a camera's megapixels?

I have a Nikon D40. It has only 6.1 MP. I am planning to buy additional lens for it. Can changing the lens of the camera increase or decrease the megapixels of the camera?
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1answer
3k views

Should I get the prime or zoom kit lens with the Panasonic GF3?

I'm new to lenses, because currently I have the fixed lens Olympus XZ-1. I'm thinking of an upgrade, and I find the Panasonic GF3 very good. It has the option of two kit lenses: A pancake lens at 14mm ...
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3answers
651 views

Is there any damage that a lens can have that is unrepairable?

Just wondering after I dropped my lens and had it repaired is there any specific kind of damage that would ruin a lens to the point where you'd be better just buying another used one. I'm ...
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6answers
2k views

Which lens will fill the kit lens gap on the Canon 550D/Rebel Ti?

I own a Canon 550D, Rebel Ti, can anyone recommend a good general purpose zoom lens to bridge the gap between these following lenses: EF-S 10-22mm EF 70-200mm F/4 L I would like to upgrade in due ...
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3answers
349 views

What lenses should a college photography club buy to go with an entry-level Nikon body?

We have a photography club in our college and I am the secy. Finally we got some budget approved and we are planning to buy some stuff for our club. I am thinking of buying a Nikon D3100 body. For ...
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4answers
3k views

Which lens to buy: 50mm f/1.8G or 10-20mm as first extra lens for travel to Japan?

I have recently bought a Nikon D5100 with a 18-55mm and a 55-200mm kit lens. Now I am planning to travel to Japan (next April) and I would like to buy a new lens now in order to practice before ...
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1answer
3k views

How to read a lens spot diagram?

How to read such a lens spot diagram?
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2answers
624 views

Why doesn't Canon 18-200 mm lens show any visible difference from 170 to 200 mm?

Not that it's very important but I'm wondering why doesn't a Canon 18-200 mm lens have visible change in framing between 170 and 200 mm? Why is it declared as a 200 mm lens if it stops zooming at ...
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1answer
328 views

How does the Tamron 55-200mm LD macro lens compare to the Canon 55-250mm IS?

I have a Canon 1100d, the standard 18-55mm lens kit, and the 50mm f1.8 lens. I want to buy a zoom lens as I would like to be able to get closer to far away subjects. I have been looking at both the ...
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1answer
2k views

How do straight edges end up curved in photos?

In the standard model for a lens straight lines in the subject of a photograph will always end up straight. However I have seen a variety of photographs in which straight lines end up being curved, ...
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4k views

What are Barrel and Pincushion distortion and how are they corrected?

I have some questions regarding Barrel distortion and pincushion distortion. Since they are related I have put them in single post. I am aware that barrel distortion occurs more in wide-angle ...
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4answers
370 views

How do you reconcile generally positive user comments with negative comments in a review?

My question was prompted by this DPReview review of the Nikon DX 18~200mm, wherein on page 3 the author reveals some significant sharpness and distortion issues, leading to final assessments of ...
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1answer
171 views

Tips for Trip to Alaska [closed]

I will be going to Alaska this March. please let me know which lens I should buying/leasing for the trip and what are best practice. What are cant miss places and what other equipment I need to buy. ...
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2answers
1k views

What is a Carl Zeiss lens in a camera?

I have a Sony CyberShot camera and I don't know why they use a lens in the camera. What is a Carl Zeiss lens?
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2answers
682 views

What are good websites to buy second hand/after market lenses? [closed]

Besides the obvious eBay and Craigslist, are there any good sites for second hand lenses?
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3answers
5k views

What is the cause of these round spots on my photograph? [duplicate]

Possible Duplicate: Dust-like speck visible every few pictures — is it dust, or worse? Is this a finger print on the lens? I don't know. What can be the cause of the round spot on this ...
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1answer
725 views

Dust-like speck visible every few pictures — is it dust, or worse?

I seem to have to dust-like speck on my Sony Cybershot S950's lens, but it appears randomly every few pictures. Could something be going bad internally?
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5answers
3k views

How much different are the Tamron 17-50mm f/2.8 stabilized (VC) and non-stabilized versions?

I have seen these 2 lenses being suggested by many people across the site as general purpose zooms and an upgrade to the typical 18-55mm kit lenses. The price difference seems to be around $200 (~INR ...
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1answer
631 views

How does the megapixel-count and the aperture size affect the quality of the image from a given lens?

I have read that some lenses don't "support" high resolutions, so, for example, for some lenses (e.g. Nikkor 16-85 VR ), it's better to shoot at 9MP, instead of shooting at 16MP. Is this the case ...
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5answers
11k views

Can you recommend a macro lens for a micro 4/3 camera?

I've recently purchased a micro 4/3 camera (Panasonic GF1), and I'm aware that with an appropriate adapter, I can use a large variety of third-party lenses. I'm interested in experimenting with macro ...
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2answers
469 views

Could a filter damage the curved front element of the Canon EF 100mm f/2.8 Macro USM?

I just got the Canon EF 100mm f/2.8 Macro USM and I really want to put a UV filter on the lens to protect the front element, but I feel uneasy screwing one on because of the curved front element. I ...
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1answer
722 views

What does “distortion <XX%” mean in lens specs?

I'm going to buy a lens and I would like to understand what "distortion <XX%" means. It's a vari-focal 10-60mm lens, and mentions distortion <12-1%. According to my understanding, at 10mm focal ...
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4answers
1k views

What lens should I buy to get better pictures of a one-year old running around a dimly-lit house?

I'm an amateur photographer with a Canon Rebel XS, and I'm trying to figure out what type of lens I should buy to take better photos of my one year old when she is running around in our dimly lit ...
3
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4answers
667 views

Is there a single lens suited for flying birds, mountains, and close-up portraits?

I have just bought a new DSLR (a Nikon D3000). I want to take photos of flying birds, mountains, and close-up portraits. Is there a single lens well-suited for these types of photography, so that I ...
4
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6answers
3k views

What are the advantages to using EF-S lenses on Canon APS-C cameras?

I know EF-S lenses are "optimized" for crop sensors but what are the exact advantages to using an EF-S lens? Does it give better color, sharpness, depth of field, etc...? In addition, do EF-S lenses ...
2
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0answers
118 views

How to test used/second-hand lens? [duplicate]

Possible Duplicate: What should one look for when buying a used lens? I am going to buy second hand AF-S DX NIKKOR 18-200mm f/3.5-5.6G ED VR II. The price difference is noticable so I would ...
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5answers
3k views

Are lenses for my Canon Rebel XT compatible with the Canon 7D?

I am looking to purchase a 7d and currently have an XT. How do I find out if the lenses I have are compatible with the my new potential camera?
7
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2answers
345 views

Do normal macro lenses suffer the same light reduction as tubes?

When stacking tubes to make a normal lens a macro lens, you have significant light lost due to the increased distance. Do normal macro lenses suffer the same fate? Why or why not?
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3answers
2k views

Nikon non-VR 70-300 lens for entry-level bird photographer?

I am an entry level photographer who'd like to start taking pictures of birds. I have a Nikon D40 and am on a budget. I noticed on the B&H site that the non-VR Nikon 70-300mm lenses are around ...
4
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2answers
463 views

Is it normal for the Canon kit lens to exhibit lens flare even without a UV filter?

I recently bought a Canon 550D and have been experimenting with this for a week. I have been pretty satisfied with the quality, until I faced this lens flare problem. Notice the unwanted blue light ...
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3answers
2k views

Do you have advice for buying my first lens after kit 18-55mm (sub-$300)?

I’m looking to buy my first lens beyond the kit 18-55mm for my Pentax K-x. As a student my budget limits me to around a sub $300 offering. I am new to photography, and so I have a hard time answering ...
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0answers
344 views

Why do I have a red dot in every photo? [duplicate]

Possible Duplicate: Why is my camera showing a lot of stuck red and white pixels? Every picture that I took today have a red dot on the same place in every photo. It looks like a monitor ...
2
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2answers
561 views

How can I find which lenses have “Continuous manual focus”?

Canon lenses with USM auto focus can be called "continuous manual focus" (at least some). By this I mean that you can override the AF without switching it off. I've found this very handy, and I often ...
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2answers
2k views

AF-D vs AF-G: is the aperture ring necessary?

I just purchased a Nikon D7000 with an 18-105 f/3.5-5.6 AF-S lens. I'm also looking at purchasing a lens around the 200-300mm focal length range, and I found the 70-300mm f/4-5.6 AF lens. As far as I ...
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1answer
210 views

What constitutes the quality difference in lenses with exactly the same specifications but different brand names?

Example: I wish to purchase a lens with the fixed maximum aperture of f/2, and some other features. If I get the exactly same specifications in Tamron and Nikon, on what basis should I decide which ...
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4answers
1k views

Tamron AF 70-300mm f/4.0-5.6 Di LD Macro Zoom Lens for Canon Digital SLR Cameras for Canon Rebel T3i

does Tamron AF 70-300mm f/4.0-5.6 Di LD Macro Zoom Lens for Canon Digital SLR Cameras suite my Canon 600D? and is it good for macro photography? I'm looking for a cheap option (under 200$) to shoot ...
18
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9answers
23k views

What features differentiate Nikkor and Tamron/Sigma lenses?

I'm wondering if anyone has an opinion about Nikkor vs. Tamron and/or Sigma lenses. Is it worth the extra money to purchase Nikkor lenses? I haven't had the chance to compare these. Are the Nikkor ...
8
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3answers
294 views

What are the standard tests available to quantify lens parameters?

In some of the questions I have asked here, some of the terms frequently used to describe the difference in image quality between the cheaper lenses and the premium ones have been increased contrast, ...
2
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1answer
595 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 ...