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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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3
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1answer
445 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
3k 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
512 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
votes
2answers
790 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
votes
1answer
474 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
431 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
531 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
205 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
545 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
232 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
495 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
614 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
429 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
3k 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
388 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
327 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 ...
6
votes
3answers
863 views

Have I broken my Canon 28-135mm lens after DIY repair?

Last week I removed the front element from my Canon 28 - 135mm lens to remove a grain of sand from the lens. It was easy to remove the 4 screws, take of the top layer of glass and remove the grain. I ...
27
votes
3answers
3k views

What does a hexagonal sun tell us about the camera lens/sensor?

In this picture, we see that the sun comes out as a hexagon. I am sure it is not arbitrary. What does the hexagon tell us about the instrument that captured the image?
5
votes
3answers
912 views

For fast daytime shooting of external buildings and indoor art, should I choose 24-70 mm or 70-200 mm?

If I'm on a daytime cycling/walking tour (i.e. little time to compose or change lenses) of external buildings and inside churches (no flash and no tripod), which lens is best to capture non-blurry ...
0
votes
1answer
712 views

Relationship between camera sensor size and lens focal length [duplicate]

I am choosing a camera and lens. I want to buy a Canon EOS 650D, as this camera seems to be a good point of entry into the world of SLR. My question is in the following: The EOS 650D has a cropped ...
2
votes
1answer
124 views

Is there a popular/canonical lens system out today?

I'm entering the world of film photography by buying a cheap Pentax K1000 and a cheap K-Mount lens. Initial research says that the K-Mounts are still in use today, but I'd like to know your opinions ...
3
votes
1answer
129 views

How can I work out how far away I need to be from the set to get it all in frame?

I am planning on shooting a bedroom from above. I am planning on getting a high ceiling studio if I can, and I want the bedroom I build to be the same aspect ratio as the camera lens (so, 16:9?). But ...
0
votes
2answers
897 views

How does the Tamron AF 28-75mm f2.8 compare to Canon EF-S 15-85mm f/3.5-5.6 IS USM?

I am looking to buy a good walk around lens for t3i to finally upgrade from my kit lens. My current preference is Canon 15-85. however I am wondering if I should get Tamron AF 28-75mm f2.8. I am ...
-2
votes
1answer
178 views

Must-have lenses for DSLM/MILC camera?

I am new to the more profession photography. Things that could be easily done with my old compact camera (Sony F717) are more complicated now. For instance: take close-ups at only 2-3cm distance while ...
0
votes
1answer
505 views

Nikon lens naming [duplicate]

Possible Duplicate: What does all those parts in a lens name mean? I'm thinking about buying myself a new lens for my Nikon and I have a question about the naming conventions Nikon uses for ...
3
votes
2answers
675 views

Can I use macro extension tubes with a non-manual lens?

I am new to macro extension tubes and I want to buy one but I don't have a manual lens (one where I could change the aperture manually) so I don't know if an extension tube would work with my lenses ...
5
votes
6answers
1k views

Reducing my gear list after moving from Canon APS-C to FF

I am going to order the new Canon 6D and therefore, I'll finally be transitioned into the world of FF very soon after using crop since the 400D and 50D. Here's my gear list at the moment that I'm ...
2
votes
2answers
2k views

How to clean contacts on my canon 1100d DSLR?

I keep getting an error message on my canon 1100d, when taking photos on my 70-300mm tamron lens when the lens is on 300m it wont take the shot, it keeps showing an error message about the contacts ...
1
vote
2answers
434 views

What does it mean for a telecentric lens to be focused to infinity?

I have a question about a telecentric lens Ive been studying (for physics research!) and was wondering if you guys could help clear some cobwebs in my head. For starters, I am simplifying the TC lens ...
6
votes
3answers
569 views

Filming in a steam room?

I plan to film in a steam room this weekend for a cover shoot. However, I know for a fact there may be difficulties regarding the "steam." Any tips for filming in a steam room?
4
votes
3answers
522 views

Are modern telephoto zooms so improved that they're not a big tradeoff vs primes? [duplicate]

I am looking for a good amateur telephoto lens for Nikon DSLR. It's main purpose will be sport shots. Back when I learned photography with film SLR, a fixed focal lens was significantly better than a ...
3
votes
1answer
369 views

Can I attach a Kiron Lens to my Canon Rebel T1i?

I have a Rebel T1i, and was given a Kiron 80-200mm f/4.5 macro. I'm wondering if there is a way I can use them together - and if so, where I may be able to find an adapter? Should I even waste my ...
2
votes
5answers
1k views

What the best telephoto zoom lens for everyday use with a Canon 7d with a $2500 budget?

I tend to shoot outdoors / landscapes / nature significantly more than I do portraits. I was looking at the Tamron (i think) 50-500 - because it seems so damn fun. But that's the kind of upward ...
1
vote
4answers
11k views

Should I buy a Canon 55-250mm lens or 70-300mm for my Rebel T3i? [closed]

Should I buy a Canon 55-250mm lens or 70-300mm for my Rebel T3i? I have the basic 18-55mm lens that came with my camera but I need a next step up that's not too expensive. What are the most common ...
1
vote
4answers
187 views

Photography: the technical side [duplicate]

I love photography. To be honest, I've never seriously taken even one photo, but I love it. Looking at other people's work on sites like 500px and other discussions on this site, it really makes me ...
6
votes
3answers
10k views

What does “the telephoto end” and “the wide angle end” of a zoom lens mean?

In the Canon Rebel T3i Manual, page 59, it's mentioned that "If you have a zoom lens, use the telephoto end to fill the frame with the subject from the waist up." Same note on page 61 and another one ...
13
votes
4answers
767 views

Does Canon make an L series lens with a plastic lens mount?

An online retailer is telling me that Canon 24-105 f4L lens comes in two versions, the USA model with a steel lens mount and an import with a plastic lens mount. Is this true?
0
votes
2answers
89 views

Will a Nikkor AF-S 70-300mm f/4.5-5.6 G IF-ED VR lens work on my Sony A900?

I have a Sony A900 that I want to use with Nikkor AF-S 70-300mm f/4.5-5.6 G IF-ED VR. Does this lens come with a Sony mount? I do not want to have to use an adapter.
-1
votes
2answers
205 views

Suggestions for Lens for my D5100 [duplicate]

I got the Nikon D5100 recently. I'm happy with the 18-55mm lens, but now am moving out to a different country on short trips and occasionally love to experiment with shots at landscapes and nature. ...
25
votes
4answers
4k views

How do you find out the “sweet spot” of a lens?

I've tried googling this, but have never found a satisfactory answer. I've heard the term "sweet spot" thrown around by some photographers to mean the f-stop of a lens which results in the highest ...
5
votes
2answers
820 views

What are the differences between dslr lenses and video/film lenses?

I've heard several times that one of the reasons videographers are so interested in DSLR video is access to the wide range and low cost of dslr lenses. It would seem to me that they would be very ...
0
votes
1answer
87 views

Which lens should I buy? [duplicate]

I have Canon 550D and 18-55mm IS II kit lens. I shoot landscape, macro and wildlife photography. My budget is $200 and looking for some zoom lens options. I have searched a lot and found following ...
2
votes
3answers
3k views

Lens with small scratches on the front element - how do they affect IQ?

I am looking to buy a CANON 28mm 1.8 EF lens. I found an offer, significantly discounted, of a lens with small scratches on the front element. The offer is very tempting. Here is a photo posted by ...