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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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6answers
1k views

Is small sensor always a bad thing?

I own a DSLR. I want to buy some not-too-expensive compact, and there are a lot of compacts in the range 100-250$ with 1/2.3" sensors. Can such a sensor/camera set give a quality somewhat comparable ...
14
votes
5answers
723 views

What are the different focal lengths of macro lenses and their advantages?

I am interested in macro-photography. I see there are macro telephoto (zoom?) lenses (e.g. 200mm), or smaller macro lenses (e.g. 40mm) ... What are the different types of macro lenses and their ...
0
votes
2answers
726 views

How do you remove the Canon 300mm f/2.8L IS II USM Tripod Collar?

I was wondering if anybody has any knowledge on the tripod collar on the 300mm f/2.8L IS II USM. I have an application where the collar needs to be removed to mount the lens in a rig. With other ...
0
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1answer
134 views

Can someone give me an. Example of when you would want to stop down? I do this manually? I just purchased a Canon 3Ti with a Canon 18-200 lens [duplicate]

Can someone give me an. Example of when you would want to stop down? Do I do this manually? I just purchased a Canon 3Ti with a Canon 18-200 IS lens. We will be shooting outdoor sporting events also ...
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vote
0answers
1k views

Are Canon T2i lenses usable with 5D Mark II cameras? [duplicate]

I presently own a Canon EOS t2i and I am looking to purchase the Canon EOS 5D Mark II. Are all my lenses compatible?
0
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0answers
98 views

What are the qualities of a good macro lens? [duplicate]

What are the qualities and technical specifications of a good macro lens? I need a Macro lens (micro for nikon) to shoot insects (for scientific researches) and other small objects. These are the ...
4
votes
3answers
324 views

How do they come up with focal lengths for lenses?

There are a lots of lenses for each camera and I understand that each lens caters to a different use case but my question is on how they arrive at these numbers. For eg: there are prime lenses which ...
3
votes
4answers
424 views

How is it possible to have shallow depth of field with a small aperture? (The tele-macro paradox.)

Some longer tele lenses have a macro mode that allows for really shallow depth of field that have a lot of background melting when using relatively narrow apertures; like f/4.5-6. I have tried and ...
14
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11answers
7k views

Will a 50mm f/1.8 work for general outdoor photography?

I want to know if it's advisable to use 50mm lens for general outdoor photography. I'm torn between 35mm and 50mm primes, and have read all the pros and cons. I understand that 50mm could be tight in ...
5
votes
1answer
411 views

Colored powder in a lens: will it need a cleaning?

I was taking photos of people playing Holi. Some of the powdered colour landed on the lens of my Canon Powershot S95, and in the groove of the flash housing. By lens, I mean the cylindrical part that ...
3
votes
2answers
8k views

What type of effects can I obtain with UV, FLD, CPL filters if any?

Can someone give me examples and show the difference. I obtained these from amazon. I have played with them for a little while and I am not impressed/bought yet. UV filter has no affect other than ...
2
votes
1answer
435 views

Nikon Lens Warranty explanation

I want to purchase a good lens of about $1K from Nikon (the 18-300mm lens for example) and I have a few quick questions about the Nikon Lens warranty. I researched online extensively and it seems ...
0
votes
1answer
128 views

Which Canon should I buy? [closed]

I've done photography for some months now. I always borrowed an Canon 600D from a friend. Now I got a job as a party and concert photographer. (I need to use an external flash of course.) I'm just ...
5
votes
3answers
3k views

Would it be better to use a 35mm prime instead of a 50mm prime on a cropped sensor body?

It's said that 50mm is close to what the human eye sees and is a very versatile focal length in general, especially good for street photography which is what I'm most interested in. That being the ...
2
votes
1answer
540 views

If I want soft focus, should I get the Canon 135mm soft focus lens or do it in Photoshop?

I always read that when possible it's best to "get things right in camera" which I always aim for - so following that line of thinking, would it be worthwhile to get the Canon 135mm f/2.8 soft focus ...
7
votes
5answers
901 views

Why not have the diaphragm in camera body instead of the lens?

Why is the diaphragm to control the amount of light entering the camera typically in the lens and not the camera body itself?
2
votes
3answers
1k views

Why does my Nikkor 12-24mm lens vignette on my Nikon D800?

I have a Nikon D800 and am using a Nikon 12-24mm lens with it. When completely zoomed out it produces a vignette that I don't particularly care for. I've never seen this with my other Nikon DSLRs ...
12
votes
6answers
1k views

Do lenses lose sharpness when they age?

I was reading this answer where it mentions, "..it's a lens that can lose sharpness as it ages.." and was wondering if this is true and if yes, true for all lenses. Reasons as to why this happens and ...
5
votes
3answers
603 views

For MTF, why does 10 represent contrast while 30 represent resolution?

I'm trying to learn to read MTF charts. Everything is making sense to me, except why most explanations of MTF will refer to the 10 l/mm line as a measure of contrast while referring to the 30 l/mm ...
0
votes
3answers
4k views

70-200mm lens: Canon or Sigma? f/2.8 or f/4?

I was thinking of buying a Canon EF 70-200m f2.8 mk1 (I would love to buy mk2 but here's a noticable difference in price, at least in my country), but after awhile I came to the conclusion that this ...
32
votes
7answers
1k views

Do good lenses really last a lifetime?

I’ve heard people say “a good lens will last a lifetime” many times. Is this actually true of modern lenses? More specifically, will a good lens be usable for a lifetime? With an inexpensive adapter, ...
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2answers
1k views

Will a Tamron 70-300mm f/4-5.6 lens fit a Nikon 1 J1 camera?

Will a Tamron 70-300mm f/4-5.6 DI LD Macro (Nikon AF) fit a Nikon 1 J1 camera?
4
votes
1answer
688 views

What's difference between DSLR and bridge camera lenses?

A typical zoom/telephoto lens can cost a lot but a Canon PowerShot SX40 model has a zoom lens of 24-840mm ! And the camera as a whole still costs less than a single lens. I know that they differ a ...
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3answers
257 views

Canon EF 24/28 mm f/2.8 IS USM Autofocus Lenses

Is there a good reason to choose one lens over the other? Granted that the 24mm lens is a bit wider than the 28mm lens but are there any other reasons?
2
votes
2answers
3k views

How does the Canon EF 75-300mm USM III compare to the Canon EF 70-300mm USM IS?

The Canon EF 75-300mm USM III lens costs 179$ on Amazon whereas the Canon EF 70-300mm f/4-5.6 IS USM lens costs 500$. Now the differences I see are: The 70-300mm has IS The 70-300mm has 8 diaphragm ...
3
votes
4answers
8k views

Why do some people prefer 50mm to 35mm prime lenses, even for a crop sensor?

Comparing the two lenses for an APS-C sensor: EF50mm f/1.8 EF35mm f/2 here Leaving out cost as a factor, EF 35mm has the following advantages: 43 degree while 50mm has 31 degree Its equally ...
1
vote
2answers
312 views

Water spots inside brand new lens? Normal or reason to return?

I bought a new lens, and discovered two stains/spots which look like water spots on the rear side (side which is plugged to the body). These stains are from the inside. I have taken a couple of ...
3
votes
1answer
459 views

Can Pentax K mount lenses be used on a 645 Reflex via an adapter?

Is it possible to use Pentax K mount lenses on a Pentax 645 via an adapter? If so, what is the name and type of adaptor required?
6
votes
4answers
2k views

Are there any comparison photos of different lenses (with the same camera and scene)?

I've heard claims ranging from "higher-quality lenses only make a noticeable difference for scientific applications and super-huge prints," to "even the difference between high-quality and ...
5
votes
1answer
522 views

Why are so many kit-lenses parfocal if it's an expensive feature?

According to this answer, parfocal lenses (lenses that can zoom in/out without losing focus) are relatively rare and more expensive. However, the original poster's kit-lens is parfocal. ...
5
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2answers
835 views

How can I quickly tell without testing if my lens is parfocal or varifocal?

I have read a couple of related questions, but I am curious to find out if there is a list of parfocal/varifocal lenses out there. I'm most concerned with the lenses I have and I would like to know ...
6
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1answer
495 views

When focusing at max zoom, focus is lost after zooming out. Is that normal?

On my Canon kit lens, I could completely zoom in, focus on the object and then zoom out to take the picture with the object still in focus. Now I have a Sigma 18-200mm (with a Canon 600D) and that ...
55
votes
8answers
3k views

Why do some lenses cost 10 times as much when the specs are very close?

For example, a Canon 50mm f/1.8 lens is about US$110, while another Canon 50mm f/1.2 lens is about 14 times as expensive, at about $1450. Is the 1.8 or 1.2 the main reason for the price difference? ...
2
votes
2answers
1k views

Why are large aperture lenses so expensive? [duplicate]

Why are lenses with very large apertures so expensive? For example, generally speaking, there is a significant price difference between a f/1.8, f/1.4 and f/1.2 lens of the same focal length. Doesn't ...
5
votes
3answers
448 views

What could cause a totally broken focus mechanism?

When looking for lens bargains on eBay, I often come across lenses that have something like this in their description: Lens will not focus automatically or manually. For parts or repair only. ...
5
votes
3answers
559 views

What does it mean that a lens is x millimeters?

Every lens has different focal length in terms of millimeter so if I have a 100mm lens, what does that refer to? Does it mean the length of the lens itself is going to be 4 inches long, or does this ...
2
votes
1answer
207 views

Why do the Nikon V1 lens' websites seem to give different f-stops than the lenses? [duplicate]

Possible Duplicate: How can aperture be f/11 on a lens with an aperture range designation of 3.5-5.5? I am a recent (and so far quite pleased) owner of a Nikon V1. I am in the process of ...
3
votes
2answers
8k views

What lens should I buy to get sharp pictures from my D7000?

I have just changed my D200 for a D7000 with the kit 18-105 lens. However, the quality of the pictures is not comparable with those of my D200: not as sharp, not as much definition and overall a ...
0
votes
2answers
559 views

D7000 Kit (18-55mm) or D7000 Kit (18-105)? or should I get a separate lens? [duplicate]

I'm no expert on cameras and lenses. Can you give me some pieces of advise on what to choose? If I buy the body and separate lens, what should I buy for a general purpose lens. Thank you in ...
2
votes
2answers
233 views

Should I be worried that my Canon 1dx gave an Err01 on my Zeiss 21mm 2.8 lens for ONE exposure and after that it was fine?

I had this weird experience when I was out shooting at a park. Everything was fine for the first 30 exposures or so and I was not doing anything unusual when all of a sudden on one of my exposures my ...
1
vote
1answer
509 views

Misfunction of Canon EF 50mm f/1.8 on manual focus?

I have a Canon T3i (600d) and two lenses: EF-S 18-135mm and EF 50mm f/1.8. While working with manual focus, I can shoot out of focus (on purpose) with the 18-135 (as expected). But with the EF 50mm, ...
0
votes
1answer
1k views

Canon EOS 650D + Canon 50mm f/1.8 lens calibration

I have the Canon EOS 650D with Canon 50mm f/1.8 II lens. After some tests I mentioned that I have ~1cm front focusing (see this question). Is there any way to calibrate Camera/Lens without ...
7
votes
2answers
1k views

What are ED elements?

I find that some lenses are indicated with the letters "ED", referring to some special type of lens element. What are ED elements, and what advantages do they bring? Note that this question isn't ...
4
votes
3answers
628 views

If I mount a (heavy) cine lens on a DSLR, does it need additional support?

I'm shooting some video and I'm renting a Zeiss CP.2 50mm which is a whopping 2 pound lens. I'd like to mount it on a Canon 7D. Will the lens need some sort of additional support apparatus (i.e. the ...
1
vote
1answer
445 views

How to fix lens “stuck” on Nikon D3100?

My younger sister has a Nikon d3100. Now she asks me if I can help her fix it. She uses the lens that came with the d3100 kit, and for some reason it's completely stuck. She claims that it's been that ...
5
votes
0answers
48 views

How does lens design affect the richness of color reproduction? [duplicate]

Comparing a kit zoom lens to a faster, 20-year-old prime it seems like the old lens produces richer, warmer color. I've noticed the same kind of comparisons elsewhere. What is the lens actually doing? ...
0
votes
4answers
4k views

What pancake lenses are available for Sony NEX camera?

As a DSLR owner, I am currently looking for a compact interchangeable lens camera and I currently hesitate in buying the Sony NEX-5N or the Panasonic GX1. I realize the lens options for the Micro ...
1
vote
4answers
2k views

Canon Lens EF 50mm 1:1.8 II or EFS 18-55mm IS II for EOS 650D

I am going to buy the Canon EOS 650D camera. At the moment I can afford one of the following lenses: Canon Lens EF 50mm 1:1.8 II + 18-135mm lens in future (Kit) Canon EFS 18-55mm IS II + 55-250 ...
1
vote
3answers
403 views

When lens pricing is too good to be true…avoid?

Without going into detail - I'm noticing that some Professional DSLR lenses are on sale at amazon for up to 50pct off. An example would be an L-series lens which sells for 2200 being available for ...
3
votes
1answer
330 views

How do I properly understand what f-stop is? [duplicate]

I don't quite understand why most lenses seem to have approximately the same diameter aperture regardless of focal length. F-stop is, by definition, a ratio of focal length to diameter, so a 20mm ...