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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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18
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6answers
3k views

Can a smaller sensor's “crop factor” be used to calculate the exact increase in depth of field?

If APS-C and similar crop-sensor digital cameras have a focal length multiplying effect such that a 50mm lens has an apparent focal length closer to the field of view of an 80mm on a full frame ...
1
vote
2answers
89 views

How does “designed for APS-C” affect focal length? [duplicate]

If a lens is designated by manufacturer as "designed for crop sensor" (i.e. DC in Sigma, DX in Nikon, DT in Sony), how would that affect the calculation of practical focal length (equivalent focal ...
6
votes
5answers
4k views

Why do Canon EF and EF-S lenses exhibit the same crop factor?

I have a Canon 7D, which has a crop factor of 1.6x. When using a Canon EF-S lens I get the focal length stated on the lens, when using a Canon EF lens I get the focal length times 1.6 when used on ...
0
votes
1answer
67 views

automatically change my aperture for my lens sigma 24-70 f:2.8 [closed]

I used sigma 24-70mm f:2.8 with Canon 6d I have problem in between clicking of shots. in first shot no problem in second shot picture result is dark as compare with first shot in 3rd 4th pictures ...
5
votes
1answer
994 views

What makes the Zeiss Otus 1.4/55 so special?

The new Zeiss Otus 55mm f/1.4 is nearly $4000. With faster lenses from Canon (50mm f/1.2L) with autofocus, why is the zeiss lens more than twice that of the Canon counterpart?
20
votes
3answers
7k views

What makes a Carl Zeiss lens so special in a smartphone?

There are smartphones on the market that have a focus towards photography. Some are equipped with a Carl Zeiss lens. I have looked into Wikipedia, which tells me that they are a brand who produces ...
2
votes
2answers
119 views

How to disassemble a lens assembly?

I recently picked up an Olympus OMZ 50mm f1.8 pretty cheaply of ebay. The front element has a slight mould on the rear side although so far I've not seen this affect the image quality. Disassembling ...
1
vote
1answer
55 views

How can I set the aperture in A mode with a D lens on my Nikon D90?

I use Nikon 35mm f/2d lense on my Nikon D90 but I am unable to change aperture of lens. I have the aperture on the lens set to f22 and locked, I can change aperture with the buttons and the change is ...
3
votes
2answers
150 views

What are the downsides of converting FD(n) lenses to EF mount?

Are there any downsides of converting an old FD(n) lens to the EF by means of actually replacing the mount with a EdMika or similar? The lens will become a manual focus and manual aperture control ...
0
votes
1answer
122 views

Will any EF-lens fit on a EOS film camera?

I'm not sure if this already has been asked... Also, it's probably a stupid question. I have a Canon EOS 1000 film camera, which has an EF-mount. I want to use the Canon 50mm f/1.8 II lens, but I'm ...
2
votes
0answers
80 views

How weatherproof is an average modern lens? [duplicate]

I recently bought the Panasonic GH4, which is weather-sealed. I also got the 14-140mm lens that Panasonic makes for it (I believe it's the first version and they have a new version - mine is this ...
3
votes
6answers
16k views

Can I use old Minolta AF lenses on my new Canon?

I just recently bought my first DSLR, a Canon Rebel t2i/550d. I use it mostly for video and it works wonderfully. I bought the kit lens with it, but I am looking to expand my lens collection. I found ...
5
votes
1answer
483 views

What are these blue/purple spots visible underneath the front element of my lens?

I just saw these blue/purple spots underneath my lens (attached here). This is a Nikon D90 which has the Nikkor 18-105 mm lens mounted on it. I haven't used it for maybe 2 months now, and I kept it ...
0
votes
1answer
292 views

Which Low light zoom lens with image stabilization for DSLR [closed]

Recently started doing some DSLR videos for a website. For testing purposes I got a t5i with Sigma 50mm 1.4F lens. Most videos are in low-light settings. I've been using a tripod and it's worked ...
0
votes
3answers
3k views

Wide Angle Lens recommendation for canon 70D (cropped sensor camera) [closed]

I am interested in landscape and have a 40mm f/2.8 pancake lens but finding it does not capture enough and would like to purchase a Wide Angle lens. I am find ing the prices for the Canons too much ...
8
votes
5answers
3k views

How can I get maximum DoF with no distance markers?

I am aware of what hyperfocal distance is and the general principles behind it. However, most of the tutorials I have seen and read regarding it make use of lenses with focus distance indicators. ...
7
votes
4answers
4k views

Are there any good pancake lenses for Canon EOS DSLRs?

I've always liked the thought of having a super-thin ("pancake") lens for my Canon DSLR, for when I just want to take my camera out with as little bulk as possible. I'm not even too concerned about ...
2
votes
2answers
217 views

What do resolution figures mean in lens specifications?

I'm working in computer vision and choosing the right lens is obviously as critical as having a good sensor if you're going for quality inspection (for example). Sadly I have very little experience ...
1
vote
2answers
93 views

What extender can I use with the Canon TS 24mm?

Is there an extender for the Canon TS 24mm? I heard it is possible to make it a 45mm but I can't find much information on the web.
2
votes
4answers
372 views

What kind of lens is typically used for these type of night street shots?

I've been trying to duplicate the depth of field like in these photos on snowy nights and I'm not getting comparable results. I'm using a 35mm prime lens at f/1.8 on a D3100. So my question is: Are ...
6
votes
1answer
1k views

Is image stabilization a necessary feature for wide angle lenses?

I am considering buying a 24-70mm lens, and among third-party lens makers, Tamron makes a 24-70 f/2.8 with optical image stabilization (vibration control, in Tamron's terminology). Is it really ...
0
votes
0answers
23 views

18-200 lens vs. 18-55, 55-250 and 17-300 for sale, what would be the benefits of one of these vs what I have? [duplicate]

I have a Canon 50d with an 18-200 lens, I use it mostly to take photos of my kids, on auto. I have an aquaintance that is selling an 18-55, a 55-250, and a 17-300. Will I be getting far better photos ...
5
votes
3answers
429 views

How do I separate a stuck Nikon 400mm f/2.8 AF-S (non-VR) lens from a D800E body?

I purchased a factory refurbished 400mm f/2.8 AF-S (non-VR) lens a year ago from Nikon USA. Two major malfunctions happened. To me, both seem to be related to a little metal lever inside the lens's ...
2
votes
4answers
705 views

Is the angle of view actually different on APS-C?

A 50mm prime lens, whether APS-C or Full-frame is designed around the 35mm format. As such, is the angle of view actually different on a DX/APS-C crop sensor or are we just seeing less of the full ...
0
votes
2answers
546 views

Will a Vivitar lens work with my Nikon camera?

I am new to photography and have a Nikon D3200. A friend has given me a Vivitar lens: 75-205mm macro focusing zoom, NO. 220441876. Can I purchase an adapter to make this work? If so, which one? I ...
52
votes
12answers
4k views

Is it lenses which make your photographs, not camera bodies?

I read somewhere on this site itself that you should spend more on your lenses and less on your camera bodies. Is it a myth or a fact that mostly it is the lenses which make your photographs not the ...
1
vote
2answers
494 views

Rodenstock XR-Heligon 50mm 0.75 Lens

I found this crazy lens on ebay: Rodenstock XR-Heligon 50mm 0.75 Lens (here an example: ...
68
votes
10answers
4k views

How much do lens lineups vary across DSLR platforms?

I was reading this question and recalled how often I hear the advice "choose your lenses and then choose the body that matches" in the context of deciding on a camera platform ...
3
votes
4answers
3k views

Tele-zoom lens choices for Nikon 1 J1?

I recently got a Nikon 1 J1 camera and would like a bigger lens, I've been looking on the internet for answers but can't seem to find anything. I was looking for a 30-110mm size or larger at a ...
6
votes
4answers
796 views

Should my collection of older Pentax lenses be a deciding factor in my first DSLR purchase?

First post on here so I'll try and put a bit of background. I'm brand new to taking "proper" photographs and want to get started in landscape photography as a hobby after seeing some great pictures ...
0
votes
1answer
293 views

How do the 35mm Zeiss Loxia vs Sony Zeiss Sonnar compare for IQ for landscapes?

How do the Sony Zeiss Sonnar 35mm f/2.8 and Zeiss Loxia 35mm f/2 lenses compare on the Sony a7? (I am interested more with image quality than ergonomics, build quality, price, etc.) I am ...
0
votes
0answers
86 views

How to remove oil from aperture blades?

If you go on ebay or other second hand places, you'll see a fair amount of lenses that have oil on the aperture (particularly on older lenses). I've done some reading and it looks like this oil is ...
0
votes
2answers
94 views

Actual Focal Length on APS-C cameras [duplicate]

I'm aware that actual focal length of a lens on APS-C cameras is longer than what is written on the lens. My question is, for lenses that are specially designed for APS-C cameras (like a Nikkor DX ...
5
votes
4answers
7k views

Why are objects far away inverted through a lens but not through the viewfinder?

When I look through a lens the image of objects far away are inverted but when looking the the viewfinder on my camera they are not. Why is this? I am having a hard time understanding why objects far ...
0
votes
1answer
236 views

Can I adapt a Minolta AF-mount Tamron zoom lens for use on a Canon or Nikon DSLR?

I have a Tamron Minolta AF 28-300mm f/3.5-6.3 LD aspherical macro lens, which I would like to use on a Canon EOS 600D or Nikon D5200 DSLR. The lens was used on a film SLR Minolta camera. Is there an ...
1
vote
2answers
3k views

Is Canon 16-35/4 IS better than 16-35/2.8 II at f/4? [closed]

I have had a 16-35/2.8 II for almost a year, but it broke and I might be in the market to replace it. Last week I saw that Canon had released a new lens in this range, but with f/4 and IS. Is Canon ...
3
votes
2answers
321 views

How to determine if a new lens is a subpar copy?

I have read some posts like the ones below about testing a lens to determine how well it performs optically. What I didn't see was anything on determining whether the lens performs as it should and is ...
1
vote
2answers
391 views

What should I look for in a wide angle lens? [duplicate]

I'm pretty new to photography .. would appreciate if anyone could advise me a little on comparing wide angle lenses. For example, I'm looking at the Canon EF 24mm f/1.4L II USM and Canon EF 14mm ...
5
votes
5answers
3k views

Why are Micro Four Thirds lenses so expensive compared to Canon?

I'm looking at picking up a new prime portrait lens to augment the kit lenses that came with my Olympus OM-D M-10. My brother has a Canon with a 50mm f/1.8 lens that takes beautiful photos and costs ...
0
votes
1answer
41 views

E-mount lenses to A-mount bodies?

Is there such a way to adapt E-mount lenses to A-mount bodies? If not is there a reason this can not be done? If there is such an adapter can you recommend an adapter to me?
0
votes
2answers
662 views

What Nikon cameras is a Sigma AF-k lens compatible with?

I was recently given a Sigma AF-k lens and told it was Nikon compatible. I am trying to get a better handle of what the AF-k stands for. I have both a Nikon F4s and a D5100 that I use and not ...
0
votes
0answers
67 views

How do I deal with a lens stuck on a Nikon D90?

My wife has a Nikon D90. She can't seem to switch lenses. When we push the release button the lens barely moves. Does lock back in to place though.
26
votes
6answers
5k views

Can I damage the focus system by turning the focus ring when the lens isn't mounted?

I have a couple lenses that don't have an internal focusing system, and whenever I want to put them back in my bag, I turn the focus ring to make the lens shorter. I noticed that when the lens is set ...
0
votes
0answers
37 views

Using motorized lense on a motorized Nikon body [duplicate]

Say I'm using a lens with an AF motor on a Nikon body which also have AF motor. Which one will be active? Is there a way to control it? Thanks
6
votes
4answers
1k 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 ...
0
votes
0answers
48 views

Has anyone used Canon EF lenses on Sony mirrorless cameras? [duplicate]

I'm looking to buy a Sony mirrorless camera. The draw back is the expense of extra lenses as Sony really is proud of their products. Has anyone here tried using a Canon EF lens on a Sony mirrorless ...
0
votes
0answers
26 views

Nikkor AF 70-300mm “Lens Not Attached” Error [duplicate]

My AF Nikkor 70-300mm lens stopped working with my D40 for no apparent reason. When I attach the lens, it claims there is no lens attached, even though there clearly is one attached, and the ...
0
votes
1answer
541 views

“Lens not attached” appearing whenever I try to use my Nikkor 70-300mm?

I've had my Nikon D5000 for about two years now. It has never failed me! I have only two lenses, the standard 18-55mm lens and a 70-300mm lens I received about two years ago. I've never had a problem ...
0
votes
1answer
102 views

Nikon D3200 - quality loss with stock lens and with old lenses?

I know that you can use an adapter to mount various old lenses on D3200, but would I lose quality by doing so? I even read something that said that the default VR2 lens delivers 3 times as poor ...
0
votes
0answers
10 views

Macro/Telescopic converters for Nikon D3200's 18-55mm VR2 lens? [duplicate]

Would I be able to mount the converters to this lens and would they work well and do much good for me? Are they even worth buying assuming I won't be getting any other lens for a while (they're ...