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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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4answers
319 views

What improvements I could expect upgrading from Canon EF 55-250mm IS to a Canon 70 - 300mm? [duplicate]

I enjoy taking photos with my current telephoto (55-250) but I wonder if the 70-300 could be a worthwhile upgrade. As of November 2013, it would be around a $350 investment if I deal hunt and sell my ...
1
vote
2answers
195 views

Why is my new Panasonic Lumix 35-100/2.8 lens making strange sounds?

I just bought the Lumix 35-100/2.8 lens. It focuses and zooms fine, but it makes a tiny weird sound all the time, even when not focusing. I have turned the stabilisation system off and switched to ...
1
vote
2answers
136 views

About the 1.6x crop factor on a crop body [duplicate]

I have a 600D and a 7D and I use the kit lens " EF-S "18-55mm and the 55-250 mm , and I am thinking of buying a 24-105mm f4 IS USM L... so does the EF-S suffer from the same 1.6x crop factor as the ...
1
vote
1answer
117 views

When the batteries are fully discharged, the lens does not get in!

I own Sony HX 300 camera. I have two batteries. In one particular lithium battery, the camera cannot get its lens in when the batteries are fully discharged. On the other hand, the other battery has ...
7
votes
3answers
417 views

Is it possible to get a lens that will capture both far away and very close-by objects?

I have Sony A58 with 18-55mm standard lens. It's been almost 6 months that I have been using it and now I have started to feel that I can't either far away objects or very close-by objects with crisp ...
2
votes
1answer
89 views

Thread size and filter diameter

I am trying to buy my husband a gift from photojojo. He has a Canon DSLR. It's the EF-55-250mm. I have found a white balance lens cap that needs a size and the photojojo site says to look for the ...
0
votes
2answers
362 views

How do I convert focal length to maximum distance?

I would like to know whether there is any relation between focal length and distance. For example, what is the max distance I can shoot from a 55mm-300mm lens?
1
vote
2answers
283 views

What is the Zeiss Planar T* 50mm lens?

I was looking for a 50mm f/1.4 lens for Canon mount. I was looking at the usual options when I came across this one : ...
7
votes
2answers
246 views

How do you judge the build quality of a lens?

Some lenses - mostly expensive ones - are consistently praised in reviews for their great build quality, whereas others get very low credit in this regard. To be honest, I cannot tell much of a ...
5
votes
1answer
758 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?
4
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1answer
431 views

Why is anamorphic bokeh oval shaped?

I understand that an anamorphic lens "stretches" an image when it is recorded, but when it's played back, it's "un-stretched" so that it looks normal. But with images shot with anamorphic lenses, ...
0
votes
3answers
282 views

I'm getting the kit lens; should I add a 55-250mm or 50mm prime lens?

I am planning to buy a Canon 600D with 18-55 Kit lens. This is going to be my first DSLR. I can afford a 55-250 mm IS II Lens ( as Combo Kit ) or a 50mm F/1.8 Prime lens with my budget. Please ...
1
vote
3answers
174 views

I changed my camera lens while my camera was on [duplicate]

I changed my camera lens while it was switched on. It was my first time doing this because I usually switch off my camera and change the lens but this has been the first time I've changed the lens ...
0
votes
1answer
325 views

Will a “Sigma AF Telephoto 1:5.6 f=400mm Multi-Coated Lens Japan for Canon AF 072” work with Canon EF mount?

Just have a quick question, recently purchased a cheap Canon 1DMK2 but until then I have exclusively used Sony DLSRs so I am not familiar with Canon mounts/lenses. I have been looking on eBay for a ...
0
votes
1answer
236 views

What type of lens do I need to capture the football field or basketball games from the bleachers [duplicate]

I have a Nikon D3000 camera. What kind of lens do I need to capture my grandson on the football field or playing basketball, while I am sitting in the bleachers?
1
vote
2answers
174 views

What is the lens on top of the 105mm lens?

Does anyone know what's on top of the AF MICRO 105mm lens? The picture is quoted from a image system set up, trying to figure out what's each part of them. Thanks in advance!
2
votes
2answers
240 views

Can I polish a scratch off of lens contacts?

I have a Canon lens (ultrasonic 17-85mm) and the biggest of the contacts is scratched slighty. It is now showing a connection error. It works only from time to time. Is there a way to polish the ...
1
vote
0answers
527 views

Macro shots using Nikon AF-S 55-300mm [duplicate]

I know, it's not a macro (or, in Nikon terms, Micro) lens. But, want to use it that way sometimes. Though, for budget's sake, i was considering a Tamron AF 70-300mm(F/4-5.6 Di LD Macro), but, ended ...
1
vote
1answer
159 views

Does the Nikon 50mm 1.8G have a rubber seal?

I have the 1.8D already and I know it doesn't have a seal. I am wondering of the G does because if so I might replace the D with a G so I can be better assured if I take my camera on holiday ...
2
votes
2answers
207 views

Can an Optical Low Pass Filter be applied via a lens filter?

I constantly see references to video being the application where an Optical Low Pass Filter is most useful, but it seems that still images do best without one. Would it be possible to then have a ...
0
votes
3answers
185 views

How do old lenses get dented just on the filter ring?

I often see old Nikkor lenses for sale that have one deformation on the lens barrel, at the level of the filter. The focusing barrel is intact, the rest of the lens is in good condition, the glass is ...
3
votes
5answers
1k views

Should I replace the Canon 18-55mm f/3.5-5.6 kit lens with a 40mm f/2.8 or 50mm f/1.4?

So I'm about to buy my first DSLR (definitely a Canon, probably the 700D) and my original plan was to buy the one with the included 18-55mm f/3.5-5.6 kit lens. At the same time I was thinking about ...
1
vote
2answers
766 views

What are the differences between Tokina 11-16 mm f/2.8 DX and DX-II (Nikon mount)?

I am comparing two versions of Tokina 11-16 mm lenses for Nikon mount: AT-X 116 PRO DX vs. AT-X 116 PRO DX II As far as I can tell from producer's website, one difference is internal focus ...
18
votes
5answers
805 views

Why do two lenses with the same F-number give different amount of light?

Why do the following two lenses provide different amount of light? In both images we have fixed focusing distance, distance to the object, ISO, shutter speed and F-number.
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votes
2answers
103 views

Does Stopping down affect the performance of the sensor's AA filter?

I noticed a while back that with a lens stopped right down (say f16-22), any dust on the sensor becomes much more noticeable and "focused", and wide open (say f1.4) it is practically invisible. This ...
0
votes
1answer
110 views

Why does my Canon 50mm f/1.8 have an interference pattern on the viewfinder

This is on my 600D. I'm a noob so forgive if it's obvious. There's a clear moire-like interference pattern on the viewfinder on the 50mm which is not as obvious at all on the kit lens. It's especially ...
2
votes
2answers
139 views

What would appear on polaroid film exposed without a lens?

I am trying to get a better understanding how lenses & focusing works. Let's say that I am standing in a completely dark room holding a unexposed polaroid film, and turn on a TV in the other ...
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2answers
240 views

Help me understand effective f-number

If I set a lens to, say, f/2 but my focus is set to its closest point, my effective f-number won't be f/2 any more but it will be higher by a factor that depends on focal length, image magnification ...
3
votes
3answers
636 views

What is the relationship between “macro” and “telephoto” lenses? [duplicate]

Can anyone explain the difference between "macro" and "telephoto"? I know that a macro lens will give you a magnification of 1:1 but how does it differ from a telephoto lens?
4
votes
2answers
237 views

How does a DX-format sensor support FX lenses?

I have a Nikon D3200 camera. I want to buy a prime lens. I read some reviews online and understand that the "Nikon AF-S NIKKOR 50mm F/1.8G" would be a good lens to buy, but this is a FX lens. Can ...
0
votes
2answers
664 views

How does focal length relate to macro magnification? [duplicate]

I'm new to photography and would like to know a little more about zoom lens, The main thing I wonder about is this, I have a Fujifilm S4000 camera that claims to have 30x magnification. The new ...
1
vote
1answer
281 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
157 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
votes
2answers
212 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
207 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 ...
1
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2answers
852 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 ...
0
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3answers
212 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 ...
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votes
2answers
103 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
816 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
0
votes
2answers
169 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
101 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
votes
3answers
669 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
135 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
227 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
147 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
776 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
341 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
680 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 ...
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votes
1answer
375 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
365 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 ...