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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
251 views

Why isn't the size of an object in macro image exactly proportional to the ratio of the focal length and distance in front of that?

Using a Canon 550D with a EF 100mm f/2.8 Macro USM lens, I can make a 1:1 macro photo at shortest film plane to subject distance of 310 mm, thus getting 22 mm of a scale on the APS-C sensor, which is ...
5
votes
1answer
212 views

Does Lightroom take sensor size into account when applying lens correction profiles?

I have a question about using the lightroom lens correction profiles for cameras other than full frame. I have been using a Tamron 24-70 which is known for having slight vignetting (full frame only) ...
0
votes
2answers
119 views

What are some tips to keep a lens from rolling on its side when kept horizontally on a table?

Assuming we don't prefer to keep the lens vertically when not attached to a camera. I'm broadly referring to adding some sort of an attachment to keep it from rolling and falling of a table. Or any ...
0
votes
2answers
131 views

Lens Adapters For Point and Shoot Cameras?

I have an old Kodak DX7590 and I was wondering if there were any lens adapters that would work with it to turn it into a mediocre DSLR
0
votes
6answers
2k views

Choosing between Lenses Canon 70-200 f2.8L IS II vs Canon EF 70-300mm f/4-5.6L IS USM

I am considering between these 2 telephoto lenses but I cannot make up my mind on which one to buy. I have read a lot about the pro's and con's of both these lenses.. For example 70-200 f2.8 IS II ...
0
votes
0answers
34 views

Technical book or resource (non-creative) [duplicate]

I'd like a resource from which to learn about technical, non-artistic/technique aspects, such as: Onion ring bokeh, and what causes it. Choosing of lens hoods, Why chromatic aberration happens/why ...
10
votes
4answers
1k views

Is there a correct way to swap lenses?

I am regularly swap between a telephoto and a kit lens on my Olympus 500. Normally I just switch over the covers and cap to the non-use lens and drop it in my bag but today it was particularly ...
3
votes
4answers
712 views

Would a 85mm lens have allowed me to blur the background better in this photo of a DJ in action?

This is the picture I took: I had a Nikon-D610 and a 24-70mm f 2.8 lens on it and I used it on Manual mode and metering was f:2.8, Shutter speed: 1/20 sec and Focal length: 62mm. Also I was as ...
19
votes
6answers
1k views

How do photographers manage multiple lenses?

This is probably a very naive question but I will ask anyway. It appears that most photographers carry multiple lenses. Each lens serves a different purpose. I understand that. However, I can't ...
35
votes
9answers
6k views

What are the dangers of removing a lens while the camera is on?

The manual warns that you should turn the camera off to remove the lens, but it doesn't say why. I suspect this may have to do with dust, but I could imagine there are lots of other reasons. I'm ...
11
votes
3answers
2k views

Is it risky to change lenses in the cold?

I am generally a lazy person, so I am extremely averse to changing lenses on my camera in the cold. I am concerned about my fingers getting cold, but here I read that condensation is extremely ...
4
votes
3answers
1k views

How do I avoid dust entering my camera when changing lenses?

Akin to Should I be worried about getting dust inside my SLR? and What should I do to avoid switching lenses?, I have a certain paranoia of dust/debris entering my camera when changing lenses. Are ...
3
votes
2answers
254 views

lens care: compressing lens without full-time manual focus when camera is off?

The lens manuals for my lenses without "full-time manual focusing" warn not to use the focusing ring when it's in Auto-Focus mode. I assume that even applies when the camera is off, but am I being ...
6
votes
1answer
182 views

How is Nikon's PF optics different from and similar to Canon's DO optics?

Nikon has just announced a new 300 mm lens featuring a new technology called "PF" or "Phase Fresnel." This has been compared to Canon's existing DO (Diffractive Optics) lenses such as the 400 mm f4 ...
4
votes
3answers
11k views

What mm lens for distance shots?

If I am looking to take landscape and wildlife shots and some of those shots being from a decent distance what mm lens would I need? I am not sure what else I should be adding here, I am just looking ...
-1
votes
2answers
158 views

What does f/4.5-5.6G stand for on a Nikon Lens? [duplicate]

Can you please explain me what is 4.5 - 5.6G in a lense description.And how it is different from other generation of like 3.5G or 6.5. "Nikon AF-S DX NIKKOR 55 - 300 mm f/4.5-5.6G ED VR Lens"
0
votes
0answers
154 views

Are mobile phone camera lenses good enough to support 20MP sensors?

With mobile phone cameras approaching 20 MP while maintaining small sensor sizes, pixels dimensions are typically around 1 μm or lower. What about the lenses? Are they good enough to produce an Airy ...
2
votes
4answers
1k views

35mm vs 40mm: Does it matter?

I want to buy the lens Voigtlander Nokton 40mm F1.4, $449 Voigtlander Nokton 35mm F1.4, $629 I am asking, why the slightly difference in focal length, the price difference in so much as $180? ...
1
vote
4answers
405 views

What low-cost non-fisheye wide angle lenses are available for Canon and how do they compare?

I'm currently looking for a wide angle lens for my Canon T3i. I would prefer a prime lens. I want to use a wide angle lens primarily for video (so the lens needs a quiet AF motor) but for still ...
1
vote
4answers
696 views

Is the camera sensor or the lens the limit to resolution?

I have a pretty high res sensor on my camera, but sometimes I have the feeling my lens doesn't even get to this resolution. How can I tell if my camera sensor has not enough resolution or if the lens ...
0
votes
0answers
49 views

Can I use old Pentax-mount Vivitar lenses on Nikon DSLR? [duplicate]

I have some old Vivitar lenses (some still Boxed) that bear the marking PK-A/R and PK that I used on my old Pentax K mount SLR. Can I use them with my Nikon D5100 DSLR with a K to Nikon adapter? I ...
0
votes
0answers
211 views

Converter and lens combination to try on sony a7 or a6000

I have bought an a6000 with the kit lens, and it takes nice pictures but I miss some things that I was able to do with my Canon DSLR and old lenses. I have kept some of my Canon lenses. Should I buy ...
1
vote
1answer
86 views

Blurred corner problem

Nikkor 18-105 VR lens. What could cause such blurry left bottom corner? Is there anything more that I can do to diagnose problem? I have already tried the lens on different body with same result. ...
7
votes
2answers
456 views

Does lens age affect color produced?

I came into some discussion with my friend, and my friend said that age may affect the color produced by the lens, i.e., a newer lens produce better color than an old lens (of the same model). Is this ...
2
votes
3answers
178 views

Which EXIF tag to set for the 35mm equivalent focal length?

For a manual lens (*Rokinon 8mm f/3.5 Fisheye) I want to add the focal length information to the EXIF metadata in the resulting pictures with exiftool. I use the lens on a Canon 60D body. Obviously I ...
0
votes
1answer
314 views

Does the Canon EF-S 24mm f/2.8 STM Lens offer any significant advantage over the Canon 18-55mm IS II at a 24mm focal length?

Does the Canon EF-S 24mm f/2.8 STM Lens offer any significant advantage over the Canon 18-55mm IS II at a 24mm focal length (the kit lens for my T3i)? I'm looking for a cheap lens that offers a wide ...
2
votes
5answers
2k views

Does sensor size affect lens distortion?

There was recently a video posted about how different focal lengths affect portrait photography, specifically how distortion at smaller focal lengths have more distortion and are less flattering. So ...
0
votes
2answers
108 views

Why are lower focal length lenses wider? [duplicate]

Most of the wide angle lenses are lower focal length and the telephoto lenses are of longer focal length. Can someone explain (scientifically) to me how shorter focal length of the lenses is help to ...
4
votes
4answers
210 views

Is it possible to get smaller aperture with diaphragm in front of the lens?

My camera has narrowest aperture of f8. To increase depth of field, could I place an opaque "filter" or lens-cap with a small hole, e.g. 12 mm for f16, on the lens? I realize that at short f.l. the ...
2
votes
3answers
135 views

What is the best lens for shooting flat surfaces?

For a long time, I was making closeup photographs of flat surfaces using my cropped DLSR and Canon EF 50/1.4 lens. The scene was illuminated by an external flash. The focusing distance was the closest ...
1
vote
1answer
131 views

How do add on macro smartphone lenses allow you to take macro photos?

It may sound obvious, but how exactly does an add on macro lens allow you to take close up photos? Can someone give technical reasons? I'd like to know the physics behind add on macro lenses and how ...
14
votes
1answer
838 views

How does a macro lens focus so close?

How does a macro lens focus so closely and how is the system different to that of a non-macro lens?
3
votes
3answers
163 views

What criteria to consider to match cameras and lenses for shooting people at parties?

I normally don't like shooting people that much, because I like to experiment with settings, lenses etc. to get a result that I like, so it helps when the subject doesn't move (Mountains and buildings ...
6
votes
5answers
2k views

What are the tradeoffs when replacing two zoom lenses with a superzoom?

I have two lens currently for my camera. An AF-S DX VR NIKKOR 18-55mm f/3.5-5.6G (kit lens) and a AF-S DX VR Zoom-NIKKOR 55-200mm f/4-5.6G IF-ED lens. I have found that there are cases when the ...
6
votes
3answers
170 views

How do I rig up a color filter for my Sigma 8-16mm Ultrawide?

I am a bit confused... I'm not sure if the cokin system will work on my lens, as my lens doesn't have threads for a filter. I've found that placing a Z series cokin filter in front of the lens will ...
34
votes
11answers
10k 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 ...
2
votes
6answers
3k views

What is a cheap standard/wide prime lens for Canon APS-C?

50mm f/1.8 is said by many to be a great lens for its price, and one worth buying. On the other hand with a APS-C sensor it is rather long for my taste. Is there some cheap lens around 30mm or below ...
0
votes
0answers
91 views

How does the Tamron 70-200mm F/2.8 without VR/IS compare to the Nikon 70-300mm F/4.5-5.6 VR?

I'm looking at two different lenses. The Tamron AF 70-200mm f/2.8 Di LD IF Macro Lens. ...
3
votes
1answer
110 views

Diagnose a damaged lens from focus test results

I have a lens that gives perfectly decent results at f/22 and f/32. Here's its capture of an ISO 12233 test chart: It's not the sharpest lens I own, but whaddaya want, it's a quarter century old ...
1
vote
1answer
54 views

Does Pentax make a lens adapter to fit Olympus lenses?

I have some Olympus lenses I found at an estate sale, does Pentax make an adaptor to fit these?
2
votes
1answer
55 views

What is the diameter of my lens? [duplicate]

So recently I bought a used lens - Canon ef 28-80mm f/3.5-5.6 usm with the metal mount but it came with no lens cap and I want to buy one now but I can't see the diameter of the lens on it anywhere ...
8
votes
2answers
1k views

Is it normal for there to be tiny dust particles in a new lens?

I'm the owner of a new Canon 550D with a Canon 18-135mm IS lens. While looking into the lens, I noticed what I think are two tiny dust particles (I would say smaller than 1mm) behind the first glass ...
61
votes
12answers
27k 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 ...
6
votes
10answers
40k views

What should I do about Canon PowerShot “Lens error, restart camera”?

I've had a Canon PowerShot A1100 IS camera for almost a year now. About a week ago, I went on a trip, took pictures the whole trip, everything was ok. When I got home, and tried to turn the camera ...
3
votes
3answers
749 views

How to fix a Nikon 100mm f/2.8 Series E lens not being properly recognized on a D300?

I have a Nikon 100mm f/2.8 Series E mounted on my D300. When I set the aperture on 2.8 on the lens, it is seen as 1.8 on the D300. At its maximum, when set at f/22 on the lens, it is seen at f/16 on ...
0
votes
0answers
50 views

Albinar's compatibility with Canon t5

So I have an Albinar ADG 28-80mm lens, that I have acquired, and I was wondering what mount adapter would be required for it to work on either the Canon EOS Rebel T1i or T5, I have both. Thanks!
1
vote
5answers
859 views

What to gain from using a Nikkor AF-S 85mm f/1.8G instead of a AF-S Nikkor 35mm 1.8G

After debating the old age 50mm vs 35mm, I have opted to go for a 35mm. I have a Nikon D3200 with a Yongnuo Flash, and just acquired a Nikon SB-600. I shoot two things: clubs/nightlife and weddings ...
0
votes
0answers
31 views

Canon PowerShot SX160 prevent lens opening due to accidental power on?

Just bought my daughter a SX160 as her first real camera and I neglected to check if there was a way to prevent the lens from opening on an accidental power on. My old PS A710 had a slide button for ...
36
votes
9answers
10k views

Do professionals really never use a 24-70 lens?

I was reading lens reviews on the Rockwell site — mostly because it came up as first result in Google search — and he was saying professionals don't need and don't use mid-range zoom lenses like 24-70 ...
2
votes
3answers
204 views

Polariser and ND together

I'm an amateur landscape photographer, have some cheap ND filters but I'd like to take it to the next level and invest into more advanced gear. I was thinking of getting a Lee basic kit which I've ...