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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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1answer
346 views

Size of the entrance pupil vs size of the aperture

I understand that the entrance pupil is the image of the aperture as seen from the front of the lens. However, is the size of the entrance pupil the same as the size of the effective aperture? In ...
0
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2answers
224 views

nikon dslr d3100 ..certain lense wont focus and others will

My camera won't focus after a certain point and there is a kind of low screechy noise when it tries to focus. dont understand why it happens with my 55-200 and it doesnt happen with my 18-55 at all ...
2
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2answers
267 views

Why does oil leak from the aperture ring of old lenses?

I'm assuming that the oil was there initially to lubricate the aperture blades, but why does it leak out?
4
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2answers
257 views

Will the Rokinon 8mm f3.5 Fisheye work with a Canon camera?

I want to buy the Rokinon 8mm f3.5 Fisheye lens, but I saw in one review that is not recognisable for Canon because there is no a chip which is necessary. What is that exactly? Will I have problems ...
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2answers
1k views

Canon Sharp Zoom Lens for Fashion Photography

I am looking to buy a Canon L lens, preferably a zoom to cover various ranges and focal points. I had a look on the new Canon 24-70f4L and it looks fantastically sharp. However, someone mentioned on ...
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3answers
233 views

Can I estimate the light gathering power of a lens by measuring size of entrance pupil?

Supposing I have an unknown lens of which I don't know f/# and focal length. I want to estimate the total amount of light that my lens can collect which, I believe, is given by the solid angle that my ...
-4
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2answers
109 views

Canon 50mm f/1.8 [duplicate]

Is it worth buying a Canon 50mm f/1.8? What is the lens good at? I read a review that it is good at doing Bokeh. I tried using my Canon 18-200mm to do a Bokeh effect, but it wasn't that good.
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2answers
1k views

What is a Canon Digisuper lens and why is it $200,000+? [closed]

What is this... thing?! And what's so special about it? http://www.bhphotovideo.com/c/product/887615-REG/Canon_xj100x9_3b_af_lo_XJ100X9_3B_Digital_Zoom_Lens.html
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2answers
176 views

Zoom Lens suggestion for hobbyist photographer

I would like to purchase a DSLR. Please note that this is my first DSLR camera and I am a poor graduate student so I am foregoing almost 6 months of warm dinner to purchase this. I have decided to ...
3
votes
1answer
107 views

Lens f-number and speed on adapted lenses

A lens has a focal length, and its entrance pupil has a diameter. The ratio of these is an f-number. The size of the entrance pupil is limited by the size of the front element, and we describe lenses ...
2
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3answers
1k views

Can I use a Pentax lens on a Canon body?

I have a SMC Pentax-M 50mm 1:2 prime lens and a Pentax MC auto 28mm 1:2.8 from my dad. I have been looking at two film cameras lately, the Pentax MG and the Canon AE-1. If I buy the Pentax MG I know I ...
3
votes
1answer
138 views

Why would a Nikon lens be missing its rubberized focus ring?

So, I was browsing eBay for Nikon 85mm f/1.8 lenses and I came across this listing. The remarkable thing is the neat absence of the focusing ring, but otherwise pristine appearance of the lens. I was ...
2
votes
2answers
285 views

What lens will fit a Canon 10D?

I got a Canon 10D from a friend, the camera doesn't have any lens so I've been trying to find lens for it online. The problem is that I'm no expert in photography, and very unsure of what lens would ...
2
votes
2answers
151 views

Installing SLR lens on incompatible devices?

I don't have experience in photography, yet I've been curious about this question for a while and thought I'd ask about it here. I have a few SLR lens for different cameras.. Nikon, Canon and more. ...
7
votes
2answers
1k views

Which Zeiss lenses are actually made in Germany?

Recently, I used a Zeiss Makro-Planar T* 2/100 ZE only to find a big "Made in Japan" marking on it. Which of their lenses are made in Germany, and does it matter if it's made there vs. Japan?
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2answers
489 views

How to fix Canon 17-40mm F4L loose zoom ring

I bought a used Canon 17-40mm F4L a while ago, and I just noticed it had the Zoom Ring kind of loose and also a lot of my pictures that were taken at the widest were 19mm instead of 17mm
4
votes
4answers
877 views

Canon EF135mm f/2L vs 70-200mm f/2.8L IS for Indoor shooting

I'm doing an indoor shoot of a large event with lots of people (which I was informed the lighting is "dark-ish" -- think large party) and I'd like to get candids without getting too close. I'm split ...
-3
votes
1answer
544 views

What superzoom lens should I buy for the Nikon D5100?

I'm going to be purchasing a new lens this next week for a trip to the Smoky Mountains. I'm considering an 18-200mm lens. My camera is the Nikon D5100 DSLR. Could anyone give me their opinion of ...
7
votes
1answer
384 views

What lens characteristics are important in star photography?

In optimal world I would buy a lens that is good in every way. But I'm on a budget and have to find a balance in quality and price. I'm looking for a lens for star photography, so in my case it will ...
9
votes
3answers
1k views

Mark I vs Mark II Canon L Lenses

Are there any Canon L lenses in which one iteration was significantly better than the other? The price for older Canon L lenses are significantly cheaper than mark II lenses and I was wondering if it ...
0
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3answers
260 views

Shadows in corner and dark pictures-stuck filter

I have a Canon Rebel EOS T3. Great camera but some problems of late. I put a polarizing filter on it. Not sure if this is where my problems began but some pictures in normal outdoor light have black ...
13
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2answers
5k views

How iPhone 5S can have such a big aperture? f/2.2?

I thought that in order to have a big aperture such as f/2.2 a big amount of light should be able to enter to the sensor and in order to do it, a big lens was needed. How is it possible that in the ...
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2answers
205 views

Which Canon superzoom to select for clearer sports pictures? [closed]

Currently I am using an EF-S 18-200mm f/3.5-5.6 IS. But I feel this range is not sufficient for me, shooting events and sports. So I am considering an EF 28-300mm f/3.5-5.6L IS USM. It has a bit ...
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3answers
2k views

Best lens for taking pictures of surfers

I'm just trying to decide which new lens to get. I need to take surf and windsurf photos from onshore. Sometimes 300 mm is enough but there are many times they are too far away. I have a sigma 70-300 ...
2
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1answer
151 views

A recently acquired lens will focus automatically, but won't manually, why?

I have recently acquired a Sigma 70-200mm f/2.8 (Canon mount, relatively old), and it focuses perfectly in auto mode, but in manual mode the focus ring simply won't budge at all. What could be causing ...
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4answers
3k views

Tamron 70-200 Di VC vs Canon 70-200 II

I'm looking to buy a tele zoom, and was set at the amazing Canon 70-200/2.8 II, mostly for shooting indoor/concert type photography. But since its such an expensive lens I thought I'd check if there ...
2
votes
1answer
139 views

What lens is needed to change the minimal focus distance length of my camera?

Here is my problem, I Have a scientific camera, a Sony Block FCB-EH6500, which has an automatic focus. The minimum focus distance is 1 cm when completely zoomed out and 120 cm when fully zoomed in. ...
4
votes
1answer
212 views

Will a better lens help with high speed skateboarding shots?

I am shooting downhill skateboarding ranging from 30-60 mph. I'm trying to find a good lens to capture focused sharp stills of the skaters with blurred backgrounds. I have a Nikon D3200. I only have ...
3
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3answers
295 views

Modern, purely manual focus lenses for Nikon F-mount?

I've used AF-D lenses (with screw drive) on my D40 as a manual focus lens that meters, has focus indication etc. However, I want to know if there are modern lenses that are meant for manual focus ...
2
votes
1answer
127 views

What are the caveats for buying a teleconverter that is of a different brand than the lens?

What are the caveats when choosing a teleconverter brand that is of a different brand than the lens it will be attached to in attempt to maximize image quality? Lets assume the following to make the ...
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1answer
149 views

How to focus/use Olympus 40-150mm f4.0-5.6R lens with Olympus E-PL2?

How to focus/properly use Olympus 40-150mm f4.0-5.6R lens with Olympus E-PL2? When I use it sometimes I get decent photos but mostly they are blurry, low image quality. I get much better photos when ...
0
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1answer
332 views

Nikon AF-S Nikkor 70-300mm 1:4.5-5.6 G ED Lens will not autofocus

I have a Nikon AF-S Nikkor 70-300mm 1:4.5-5.6 G ED Lens that I purchased in Feb of 2013. I have been using this lens with my Nikon D3200. Up until this point my lens and camera have been completely ...
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votes
2answers
121 views

Polarizing filter [duplicate]

I am new in photography. I am planning to buy a "Polarizing filter" for my lens. Actually, I know very little about this filter. So, I am not sure, does it really necessary to take good color ...
5
votes
1answer
358 views

How to Restore Old Lenses?

I often visit an antique shop that sells gadgets like old cameras, equipment and lenses. I'm particularly interested on buying an old macro lenses from Sigma, Ricoh, and Nikkor. I would expect the ...
0
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1answer
967 views

FEE error NIKON D90 50mm f/1.8 [duplicate]

My nikon D90 is showing FEE error on all settings and is not clicking pictures at the moment. Nikon support says the answer lies in page 26 of the User's manual but i didn't find anything helpful. ...
3
votes
2answers
184 views

Are the Panasonic Leica DG Summilux 25mm/F1.4 ASPH models H-X025 and the H-X025E the same lens?

I just ordered a lens from a website that said H-X025E, but the box that has arrived says H-X025. Are they the same, or have I been delivered an older model? After looking around, most reviews just ...
4
votes
5answers
3k views

Seriously considering upgrading my Rebel T2i (550D) to either a 6D, 7D or 70D

I shoot a lot of performers in low lighting conditions. Essentially I am looking for a camera that will help me reduce the noise level significantly. I find myself rarely using the kit lenses and ...
1
vote
1answer
144 views

How does amount of blur compare between differently-sized sensors using lenses with equivalent focal length?

Let's say we compare two bundles: 1) cropped DSLR with crop factor 1.6 and 50 mm fix lens set on f/1.4 aperture 2) full-frame DSLR and 50 * 1.6 = 80 mm (which is not far from 85 mm) fix lens on ...
1
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1answer
149 views

How to protect lens from fungus [duplicate]

How can I have total protection of a lens from fungus?
0
votes
2answers
1k views

Canon 70-200 f2.8 non IS or f4 IS [duplicate]

I've been reading 70-200 f4 is vs 2.8 non is for days and still I don't know what to do. Ok..at the moment I do not do weddings. I do portraits (babies on up), I do photo shoots of a kid or kids ...
2
votes
1answer
348 views

How do anamorphic lenses produce lens flare “streaks”?

For example: What contributes to this streaking? Why doesn't spherical lenses have this effect? How is it used in photography?
0
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2answers
466 views

Do I need 50mm lens If I have 24-105 lens for canon 6d? [duplicate]

Do I need 50mm lens If I have ef 24-105mm f/4l is usm lens for canon 6d? What should be my next lens? I mostly interested in landscapes.
2
votes
3answers
133 views

Will lack of image stabilization be a problem if I'm using a tripod?

I have been looking in to the Sigma 70-300mm F4-5.6 APO DG Macro for both its macro and telephoto capability, and noticed it does not have an optical image stabilizer. I'm still new to photography ...
0
votes
5answers
2k views

is the Nikon 35mm f/1.8 worth it after i have the kit lenses? [duplicate]

I have a Nikon DX (D5100) camera with the two most basic kit lenses: 18-55mm f/3.5-5.6 VR and 55-200mm f/4-5.6 VR. These two lenses cover lots of scenarios, but I'm starting to believe there is more ...
1
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1answer
178 views

What's the difference between a diopter and an extension tube?

It seems both allow close up shots of a subject but what are the differences both physically and in use cases?
0
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1answer
267 views

“Lens not attached” appearing whenever I try to use my nikkor 70-300mm on my nikon d5000!

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
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3answers
115 views

Looking for a 300mm FX lens, with integrated autofocus motor, for under $200 - possible?

I'm starting out with photography and currently have a D3100 with the 18-55mm kit lens. I want to get an entry level telephoto, but my research has led me to conclude that if I stick with this I'll ...
0
votes
3answers
642 views

How do I take baby shower pictures in a low light situation?

I was invited to my friend baby shower last week to take some pictures for them. Most of the picture came out dark and noise. Of course I used my SB-600 flashlight but it wouldn't help that much. Is ...
12
votes
6answers
763 views

What lens characteristics contribute to attractive lens flare?

Some lenses give really harsh and unwanted flares. Some gives beautiful flares that add depth to an image. What's the science behind this?
0
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3answers
224 views

Lenses with UD Element

I have heard of lenses with UD elements. My question is what are UD elements and what benefit do they give? Can a lens have more than one UD element?