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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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11
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4answers
5k views

How wide can a lens be before it begins to produce distortion?

Some lenses will produce distortion near a photo's edges (lines that should be straight begin to curve). Fisheye lenses definitely do this, and some ultra-wide lenses will do this too. I like wide ...
3
votes
3answers
559 views

How do I choose a zoom lens to replace the kit lens?

I have a Canon 1000D with a 50mm f/1.8. I also have the 18-55mm f/3.5-5.6 kit lens, but I am not very satisfied with its performance. I'm looking for a better zoom lens. I have a budget of around ...
16
votes
6answers
37k views

How do I find the right size of filters for a lens?

I was looking to get a circular polarizing filter and an UV filter for my Canon 550D, 18-135mm lens. When I checked online I found these filters came in different sizes, like 62mm, 67mm, 72mm, 77mm. ...
13
votes
8answers
398 views

A website that can help me in choice of new lens?

Is there any website that can help me to choose the best lens? I would like to find a website where I can specify a range of minimum focus distance, a range of maximum focus distance, range of ...
6
votes
6answers
5k views

Would the Tamron 18- 270 mm F/3.5-6.3 Di II VC PZD make a good choice as my second lens?

I have a Canon 50/f1.8. I am looking for a zoom lens. After much research, I have zeroed in two lenses as my second lens: either Tamron 18-270 mm F/3.5-6.3 Di II VC PZD or Canon EF75-300mm f/4-5.6 III ...
1
vote
1answer
828 views

After considering crop factor on Nikon D90, which macro lens should I get?

I am thinking of getting Nikon AF Micro Nikkor 60mm f/2.8D. I'm not a stamp collector so what I am looking for is characteristics of 100mm macro lens for Full Frame camera. Should I get 100mm macro ...
14
votes
4answers
22k views

How does a spherical lens differ from an aspherical lens?

Many lenses (like the Pentax DA 15mm f/4 Limited, or the Nikon AF-S 35mm f/1.4G) are described as having "aspherical lens elements". Does this mean that regular lenses are spherical lenses? What's the ...
16
votes
10answers
2k views

Which piece of equipment is holding me back?

I am primarily an amateur photographer but I do take small jobs from time to time. I'm looking to upgrade my equipment but I'm not sure if I should be spending money on my body, glass, or both. I ...
7
votes
4answers
504 views

Were lenses for film designed to focus different colors at different depths, and what does that mean for digital?

I was reading the book Adobe Photoshop CS5 for Photographers: The Ultimate Workshop by Martin Evening & Jeff Schewe (Focal Press. 2011) and read this paragraph about film lenses and DSLRs: … ...
9
votes
1answer
1k views

Can the slant edge SFR method measure lens resolution greater than the Nyquist limit for the camera sensor?

The slant edge SFR method has become the standard for measuring resolution of lenses and camera systems. It works by scanning a five degree slanted edge to calculate a line spread function. This is ...
16
votes
3answers
7k views

What is the Nyquist Limit and what is its significance to photographers?

The Nyquist Limit is frequently mentioned in the context of lens and sensor resolution. What is it and what is its significance to photographers? Here is an example of it being used by DPReview.com ...
7
votes
4answers
4k views

Why and when would you consider Canon 17-55 lens over 24-105?

If I'm to buy a cropped sensor Canon camera for personal needs (family shootings, treveling etc - probably 75% outdoors some macro like + portraits + streetshootings + landscapes, 25% indoors mostly ...
14
votes
2answers
13k views

What's the difference between a regular lens and a macro lens? [duplicate]

What is the difference between a 100mm lens and 100mm macro, or 50mm and 50mm macro? Can we use a macro lens to shot portraits? If yes, what focal length is the best? Please suggest a Canon macro ...
10
votes
2answers
2k views

How can I/should I check the sharpness of my camera lens?

The sharpness of a lens is a major concern for most photographers. This might be because we are worried about a defect in the lens, a problem with our technique or a problem with the camera. Or we ...
11
votes
1answer
4k views

Does image quality of a lens depend on the camera used?

I recently bought a Canon 50mm f1.8 for my Canon 1000d. But, I find that the images are not as sharp as those I saw in the reviews or any other images taken using other cameras like the 550d and ...
1
vote
2answers
530 views

Am I being unrealistic about image quality expectations from Canon 70-200 F/4 USM IS L Lens?

I'm shopping for a 70-200 F/4 USM IS L, and took a few test shots with it. Here's a full resolution jpeg, and a 100% crop with a focus point highlighted. It was shot handheld with IS on at 70mm / F4 ...
5
votes
4answers
2k views

Why does the cheap kit lens seem to be sharper than the expensive L wide-angle?

So recently, I was just browsing through Canon's product lists and found the 17-40 f/4 L to be quite interesting, although I will not buy it anytime in the near future. Still, I decided to make some ...
6
votes
5answers
11k views

How to reverse the canon 18-55 kit lens to use it as macro?

I have been trying to use my 18-55 kit lens as a macro but have no idea how to go about it. Do I need an adapter to mount the lens reversed on the camera? Also, is it possible to use canon 50mm f/1.8 ...
2
votes
3answers
2k views

Is the Nikon 24-70mm f/2.8G lens better than the Nikon 35-70 f/2.8D?

I consider better to mean: it focuses faster it focuses better in low-light it is sharper it has less vignetting I have the 35-70mm f/2.8D and am considering upgrading to the G.
0
votes
3answers
494 views

Which lenses to buy next?

I have a Canon 550D DSLR that I've been using for the past 6 months to learn photogragphy. It has the 18-135mm lens and I also got the 50mm/1.8 lens. As I learn more I now think it's time for me to ...
1
vote
3answers
676 views

Are there any inexpensive 2x AF macro lenses for Canon?

I want to be able to take pictures like this: This was taken at 2×, but the lens costs over 1000 and has no autofocus. Is there a lens that can take pictures like this for less money, preferably ...
0
votes
3answers
348 views

In need of a quality close zooming lens with minimal distortion (canon) [closed]

The stock lens on my Canon T2i (18-55 mm f/3.5-5.6 IS) does a good job; as good as the two much more expensive Macro lens I've used. The trouble is that it's very plasticy and flimsy. I have to set ...
1
vote
2answers
2k views

Canon 550d Kit Lens or not?

I'm a beginner at photography, I'm looking at buying my first DSLR (currently the Canon 550d looks promising) so I'm wondering if I should buy the camera with the kit lens (EFs 18-55mm IS) or buy just ...
2
votes
1answer
369 views

Is the BxU measure of lens resolution still used by anyone?

The background In 2004 DxO released DxO Analyzer. It pioneered a new measure of lens resolution that it called BxU or Blur Experience Unit. Luminous Landscape reported on it (DxO Explained) and ...
6
votes
2answers
470 views

How should I use lens cleaner?

I got a free lens-cleaning kit with a lens I bought the other day. It has a small bottle of alcohol lens cleaner, but I'm not sure how to use it, should I apply it directly to the lens, or onto a ...
2
votes
2answers
2k views

What is the difference between these two Canon kit lenses?

I want to but a Canon 1100D, but I have no idea between these kits: Canon 1100D IS Canon 1100D IS II The site is in Germany, so I couldn't understand very well, but when I tried to translate, I ...
9
votes
6answers
12k views

What is a good general purpose lens for Canon?

As an upgrade from kit lens 18-55mm, which would be a better general purpose lens? Obviously there is no "best" option, as everyone has a different budget and style, but what are the best options ...
4
votes
0answers
465 views

Does a larger lens filter size imply more light and better photos? [duplicate]

Possible Duplicate: How does the lens diameter influence photo quality? I'm wondering about 50mm f/1.4 for Nikons. The Nikon 50mm f/1.4D has a 52mm filter size. The Sigma 50mm f/1.4 has a ...
2
votes
11answers
9k views

What Canon lenses do you suggest for wedding photography on a tight budget?

I am new to photography. I have Canon 1000d (with 18 -55 mm lens). My basic interest is wedding photography. I am planning to get a prime and a telephoto lens. So, my dilemma is: Should I go for ...
5
votes
1answer
231 views

Should I get a lens repaired or buy a new one?

I have a 28-135mm Canon lens that I picked up a few years ago for $200. The zoom has started sticking in the last couple of days. It still focuses fine, but can be annoying trying to zoom in/out ...
18
votes
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 ...
9
votes
3answers
671 views

What motor gets used if both lens and camera body have a focus motor?

If both a camera body and lens have motorized autofocus, would one be used over the other or would both work in tandem to speed the focus process along?
18
votes
4answers
11k views

How do camera body motors compare to in-lens motors for focusing?

What is the difference between using a motor on the camera body and the motor built into lenses? Aside from how both compare in terms of speed, what differences would I notice if I use a body with a ...
2
votes
6answers
730 views

Which Telephoto Zoom Lens?

I am an enthusiastic hobbyist who uses the camera for social events/parties once or twice every week. My current kit is Canon 60D and for close up portraits, I am using Sigma 85mm F1.4 and for my ...
2
votes
3answers
410 views

What is the difference between the two Pentax 50-200mm DA lenses?

Pentax offers two DA zoom lenses with a 50-200mm range: smc PENTAX DA 50-200mm F4-5.6 ED WR smc PENTAX DA 50-200mm F4-5.6 ED The only obvious difference I see between them is that one is weather ...
17
votes
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 ...
5
votes
3answers
928 views

For fast daytime shooting of external buildings and indoor art, should I choose 24-70 mm or 70-200 mm?

If I'm on a daytime cycling/walking tour (i.e. little time to compose or change lenses) of external buildings and inside churches (no flash and no tripod), which lens is best to capture non-blurry ...
12
votes
7answers
4k views

Does an ultra-wide lens perform well in landscape photography?

I own a DSLR for less than a year, currently shooting with my Nikon D90 and 18-70mm DX lens. Since the beginning of it, I am deeply in love with shooting landscapes photography: seascapes, skyscapes, ...
1
vote
2answers
607 views

What are the best fisheye lenses one can still buy that are full frame on 35mm film?

The vast bulk of fisheye lenses produced now are targeted at digital image sensors and so they aren't full frame on 35mm film. What are the best fisheye lenses that one can still buy reliably that are ...
14
votes
5answers
5k views

What is the meaning of “stopped down”?

Was reading this answer (emphasis mine): It also tells us that the lens was stopped down, as if it were wide open there would be no corners to cause diffraction, regardless of the number of ...
10
votes
1answer
442 views

Can anyone identify this lens?

I read once, in a book, about a lens that was an "inverse fisheye". Basically a hemispherical mirror mounted at one end of a glass tube. I can't remember what it was called, nor can I find any ...
27
votes
3answers
3k views

What does a hexagonal sun tell us about the camera lens/sensor?

In this picture, we see that the sun comes out as a hexagon. I am sure it is not arbitrary. What does the hexagon tell us about the instrument that captured the image?
2
votes
1answer
1k views

Which 70-300mm lens between the Nikon VR and Sigma? [duplicate]

I am confused about selecting a 70-300mm lens. I have 2 lenses to decide between, the 'Nikon 70-300mm f/4.5 - 5.6G ED-IF AF-S VR' and the 'Sigma 70-300mm F4-5.6 APO DG'. I hear lot of good things ...
11
votes
4answers
2k views

Is EF-S 17-55 f2.8 IS USM really a 'L series' grade lens?

Some reviews say yes. But since it costs as much as an EF equivalent, why not name it as 'L'? Is there any better lenses in this range (EF or EF-S)?
2
votes
3answers
970 views

What is a good freelensing lens I could use on my Nikon DX?

I have a Nikon D7000 and have tried freelensing with my Rokinon 85mm f/1.4, Nikon 35mm f/1.8 DX, and a zoom Nikon 35-70mm f/2.8 without much success. The problem is that everything is out of focus no ...
4
votes
5answers
1k views

Are Sigma DC 18-50 1:2.8 EX sharpness problems common with wide apertures?

I got this Sigma DC 18-50mm f/2.8 EX MACRO HSM lens few weeks ago, but I noticed considerable sharpness problems with wide apertures. Until f3.5 (or even f4.5) this lens can't really be used. I would ...
1
vote
3answers
217 views

What web-based expert resources for Nikon are similar to The Digital Picture for Canon?

I've followed Canon photo products for years and I can't go past this great expert resource on Canon cameras, lenses and few other accessories photographer should know about and read before buying ...
8
votes
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 ...
1
vote
1answer
2k views

Macro Lens comparison : Nikon 85mm DX vs Nikon 60mm (FX)

What is the point of buying the 85mm DX AF-S f/3.5G for 476$ versus the 60mm AF-S f/2.8G for 540$. It's 64$ to get f/2.8G over f/3.5G, it's close to be the same focal on a DX 85 vs 90 (1.5 X 60) and ...
1
vote
5answers
3k views

How to choose a lens to get a shallow DOF effect? [duplicate]

Possible Duplicates: Can I get a shallow DOF using a kit lens? Help with getting bokeh effect. I'm an amateur photographer, just getting into photography. I read some things about lens ...