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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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4k views

How to fix inoperative autofocus in Canon 70-200 F4 L USM?

This lens has been sitting on the shelf for years and I recently hauled out my DSLR to play with it. Turns out the autofocus no longer works. I'm wondering if there's any kind of remedy for this short ...
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3answers
458 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?
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1answer
228 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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3answers
119 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 ...
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3answers
1k 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 ...
4
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3answers
473 views

Nikon PC-E Lens .. would it work for me?

I am interested in experimenting with a Nikon PC-E lens (by renting NOT buying!) and I can pair it with an F100, D3100 or D70 body. According to Ken Rockwell's page Nikon 24mm PC-E Compatibility the ...
3
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2answers
2k views

Canon lenses sweetspots chart

The question says it all. I am looking for a chart or a table that displays the sweetspots for various Canon lenses. Is there anything available online?
0
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1answer
319 views

Canon lens FD 50mm 1:1.4 with Canon Rebel T3i - no focus

I am trying to use an old FD 50mm lens with my Rebel T3i camera but cant get focus. Is there any configuration on the camera I havo to make or it just don't work at all? Thanks!
4
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5answers
2k views

What would be a better lens option for shooting portraits?

I am doing my first photo shoot of a birthday party for a friend. I wanted to know which lens would be the better option to use for this. I have a Canon 50mm f/1.8 prime lens as well as the standard ...
8
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7answers
9k views

How do I get the best results for sports with a 70-200mm f/2.8?

Can anyone help? I am using a nikon d7000 for sports photography. My husband kindly bought me a sigma 70-200mm telephoto lens 2.8 as I shoot a lot of low light indoor sports. I have only just started ...
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1answer
85 views

Lenses for the Cannon camera [closed]

Is there a lens you can buy for the cannon that you won't have to switch back and forth between different lenses?
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3answers
190 views

How to review a lens?

My friends asked me about specific criteria when reviewing a lens, I've check ones from available online review sites, and they have different views and review basis. What are the things that one ...
9
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5answers
5k views

Which lens is sharper? The Sigma 18-50mm f2.8 or the Tamron 17-50mm f2.8?

Specifically: Sigma 18-50mm f/2.8 EX DC Macro (not the previous non-macro version. HSM is only on Nikon fit) Vs. Tamron 17-50mm f2.8 SP XR Di II LD VC Lens (not the cheaper one without vibration ...
0
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2answers
8k views

Best all round zoom lens for D3100?

New to DSLR photography and would like some advice. What would be a good all round lens for the Nikon D3100? I have got the 18-55 one from the kit, any recommendations? Also are there any other items ...
5
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5answers
1k views

Could an old Nikkor-P lens damage a DSLR?

Someone was interested in buying my D3000 body (I had upgraded and want to keep the lenses). He had a very old Nikkor-P lens, which seemed to fit onto my camera alright. But the LCD screen said "lens ...
2
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3answers
635 views

How many filters can you stack?

The rental store only has 16X (4-stop) ND Filters, and I'd ideally like to get at least 8-10 stops of filtration. How many filters can I stack on top of one another before the image starts to ...
3
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2answers
475 views

Wide Angle Lens on a Step Down ring?

I'm a beginner at photography and own a Canon 20D with two lens; a 50mm prime and a 17mm-85mm zoom. I've purchases all my filters at 67mm to fit my zoom lens and use a 52mm - 67mm step up ring to use ...
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2answers
973 views

What effect does lens separation have on images?

Suppose I have a lens with few elements cemented together. If one of those groups begins to separate over time, what effect could it have on images taken with the lens?
8
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5answers
8k views

Why does my HTC cell phone lens appear so dirty, and how can I clean it?

My cell phone lens that looks dirty; or, I'm not even sure it qualifies as a lens — it's the transparent cover. See the photo below. I'm not sure if the lens was always like this or it happened at ...
2
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2answers
590 views

Is there any practical way to measure the T-stop of a lens?

T-stop measures actual light transmission in a lens. Therefore, different f/2.8 lenses can have different T-stops. T-stops are usually only given for cine lenses. For photography lenses, is there any ...
7
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1answer
2k views

What is exactly the '3D pop' in a photography?

When reading about lenses, sometimes I come along the term '3D pop' and I think I have a rough idea about what it means; but I'd love to have a precise or scientific explanation (optics) of it. ...
1
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2answers
152 views

Advice for other than kit lens [closed]

I bought my first DSLR [D5100] 4 months ago with the kit lens. It was cool though but now want to buy a lens. I've focused on AF-S NIKKOR 50mm f/1.8G AF-S DX VR Zoom-NIKKOR 55-200mm f/4-5.6G IF-ED ...
2
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1answer
166 views

Is this VR malfunction? — viewfinder image becomes unstable again after a few seconds

I got a factory refurbished Nikon 70-300 mm VR lens a few days ago. At 300 mm the effect of vibration reduction (VR) is clearly visible in the viewfinder. The image becomes stable a second or so ...
11
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4answers
2k views

Is it problematic to mount a Canon EF 100-400mm f/4.5-5.6L lens on Rebel XSi (450D) body?

I have a Canon Rebel XSi (450D) and I'm going on a two week trip to Argentina and Patagonia where I want to try some wildlife photography. I have the kit 55-250 f/4.5-5.6 lens which I like, but I ...
3
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3answers
431 views

Can I repair minor abrasions on my Canon 14mm F2.8 USM front lens element?

My Canon 14mm 2.8 front lens, after a few years of use, has slight marks of abrasion. Very slight bruises. Is is technically possible to recoat this lens to render its original finish? (I discovered ...
3
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1answer
318 views

Can defished fisheye images have a larger FOV than rectilinear wide angle lenses?

I am trying to create a DIY wide angle webcam with the goal of maximizing my horizontal and vertical fov. I'm thinking that I need to use fisheye filters and then defish the video afterwards. Is this ...
1
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1answer
373 views

Nikon AF 70-300 mm lens zoom broken, can it be salvaged?

So I accidentally dropped my Nikkor AF 70-300 mm lens on the floor (yes, stupid). Now the zoom ring does not work. When I turn it, nothing happens. However, I can slide the lens back and forth, and ...
4
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4answers
3k views

Which aperture is the sharpest in the lens that come with Nikon d3100?

Wich aperture is the sharpest in the lens that come with Nikon d3100? I'm new to photograpy and I read about the "sharpest aperture" property that lenses have, but I read it changes depending on the ...
9
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4answers
998 views

Is it the same if you take a picture by setting 50mm in a 18-55mm lens and by using a 50mm prime lens?

Is it the same if you take a picture setting 50mm with a 18-55mm lens and a 50mm f/1.8 prime lens? Assuming that ISO, aperture, and shutter speed are the same, will both the lens give same results? I ...
5
votes
4answers
540 views

What are some options for a low-cost, general purpose, travel lens for Canon?

I'm going to be traveling the world for the next few years, and I'd like to buy a new lens for my (ancient) Canon Digital Rebel XT. I'm currently using the Canon "nifty fifty" prime lens, but the ...
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2answers
195 views

Which two lenses would be best for my bag; one telephoto (300mm+) and a portrait/landscape lens? [closed]

I need help on deciding on two good quality lenses. I currently use a Canon 600d body and I would like a lens that will also fit a 5D as I intend to upgrade in the future. Firstly I would like a ...
13
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2answers
661 views

What are the use cases of a Petzval lens?

I am interested to know when would one use these lenses and what are they best suited for?
1
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1answer
817 views

What are some of the implications of using a medium-format lens on a DSLR?

Medium format lenses can be used on DSLRs via tilt/shift-adapters (Mirex, Zoerk, etc.). A medium format lens with a focal length of, for example, 80mm, has as equivalent focal length on small format ...
2
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3answers
543 views

Are polarizing filters as useful on normal lenses as they are on wide-angle lenses?

I have seen people using Polarizing filters on many wide angle lenses. Is it worth using a Polarizing Filter on a 40mm 2.8f STM Pancake lens or any other prime lens?
17
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5answers
3k views

How can aperture be f/11 on a lens with an aperture range designation of 3.5-5.6?

I made a series of outdoor shots with Nikon D5000, with the 18-55mm 1:3.5-5.6G VR kit lens. On some shots, I see in the EXIF info f/11, and in another shot, f/9. How can that be, that the f-number ...
3
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0answers
67 views

My lens is capable of f-stops higher than the label [duplicate]

I searched on here and I read everything on this page: http://www.geometer.org/beginner/lenses.html But I still don't understand what's going on with my lenses and how they are labeled. I have a ...
10
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2answers
412 views

Why does a reverse lens act like a macro lens?

When reverse mounting a lens, it can be used to shoot macro photography, even though the only thing that has changed is the mounting direction. Why does this occur? An 'add-on' to the question that ...
5
votes
1answer
933 views

Why do Canon lenses stay wide open when off camera, but Nikkor lenses keep tight aperture?

I have only noticed this for a handful of lenses so I am probably wrong in saying that all Nikon and all Canon lenses follow suit. But from those I have seen, Nikon tend to close the iris when removed ...
2
votes
1answer
313 views

Canon 40mm STM - The focus cannot be adjusted in manual mode

I bought a new Canon 40mm STM lens and in the Lens Manual it says The focus cannot be adjusted in manual mode. Does it mean that its harmful to rotate the focus ring when the focusing mode is ...
0
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2answers
475 views

Fee error on d7000 with 50 mm lens

I've been reading up solutions for the above error that I've been having and the solution being to set the aperture of the lens to f22 did the trick. My lens hasn't been moved from the locked position ...
4
votes
1answer
178 views

Do elements drift out of place with age in zoom lenses?

I have used a Nikon 18-200 for several years and probably have 30K or so photos taken with the lens. It appears that over time the lens is less consistent in the sharpness of the lens. I have heard ...
0
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1answer
189 views

What is the cause of “internal scratches” in my lenses?

I've got a Canon 50mm with some internal scratches. This has happend me with a microscope eyepice too. They are like veins but can't be seen in the final image. Does anyone know what is the ...
0
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1answer
263 views

Compare magnification of point and shoot cameras with dSLR telephoto lenses [duplicate]

I just want to know how much magnification there is... if I have a point and shoot camera and it has 10X zoom, I'm seeing that the subject is "brought" 10x closer. So, what does a dSLR telephoto lens ...
2
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4answers
1k views

Do Lenses have a lifespan? [duplicate]

I have read an article, it's a review of a specific brand and model, but most of their reviews includes an expected "lifespan" of a lens. ↓10↑: 10-year expected life before being thrown away. ...
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1answer
64 views

want a new lens but not sure which one? [closed]

I am wanting to start my own photography business, I have a Canon Rebel T3 but I want a better lens. what is the best suggestion for great quality photos? I don't mind to spend the money where needed. ...
4
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2answers
3k views

How to safely clean the rear element of a lens

I was cleaning my lenses when I suddenly realized... I had no idea how to clean the back element of the lens. I asked Google and he only talks about the front of the lens and how you can earn money by ...
2
votes
2answers
173 views

Is there a long range Canon lens that works with an extender in the $1200 range?

I'm filling out my lenses for use with my Canon 7D. I'm trying to find a balance between buying an everyday 70-300ish lens for around $600, or spending more for an L-series that is 100-300/400 ish ...
12
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1answer
1k views

Why do some lenses focus past infinity?

On the kit 18-55 lens that came with my Nikon D5100 I have noticed that when trying to focus on infinity for shots in dark conditions (star-trails, etc) the lense tends to move past infinity out of ...
0
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3answers
3k views

Which lens to d7000? 50mm 1.4g or 1.4d?

I need to buy a lens to make portraits with my Nikon d7000. I know that for every camera model lenses behave differently, so how do these lenses perform with the d7000? Can I save money and buy the ...
44
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6answers
31k views

Why do pro photographers use huge lenses to take portrait shots?

Every time I see a photoshoot video on youtube, the photographers have the biggest lenses I have ever seen in my life to shoot portraits or full-body shots. For example, the Nikon 70-200 f/2.8 ...or ...