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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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20
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3answers
1k views

Is it physically possible to build a long zoom (17-300 mm for example) at an aperture value of around 1.4 or 1.2?

I'm curious if the physics allow a company to build such a lens of course with good IQ, minimal color aberration, maximum sharpness, and little to none lens vignetting or edge softness
17
votes
2answers
831 views

Do rounded edges on aperture blades improve image sharpness, and how?

In the description for the XF lenses for its new X-Pro system, Fujifilm crows: The [XF lenses] all offer precise control over depth-of-field and deliver excellent out-of-focus bokeh thanks to the ...
17
votes
5answers
2k views

When would one need manual focus override?

In lens reviews, ability to override auto-focus manually is often referred to as a good (and important) feature. I have rarely, if ever used that feature, so I feel I might be missing out on an ...
17
votes
10answers
5k views

Why don't more people use fisheye lenses as a cheap wide angle lens?

From my understanding, a fisheye lens usually has a coverage of 180 degrees or close to it. Given the extreme coverage and the availability of software that can turn fisheye images back to a ...
17
votes
5answers
2k views

How does a circular lens produce rectangular shots?

Is it something like the sensor captures a circular image and then what we get is the cropped version? Something like this: Or did I get it completely wrong?
14
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1answer
718 views

How does a macro lens focus so close?

How does a macro lens focus so closely and how is the system different to that of a non-macro lens?
14
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3answers
4k views

Does a bigger aperture create better photos?

I have observed that the wider the aperture, the more expensive the lenses are. However, I would like to know whether it really makes a difference in your photos or not?
12
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3answers
2k views

Does a camera's crop factor apply to the magnification of macro shots?

If I have a lenses (or in my case extension tubes) that would allow the lens to magnify 1:1, does a 1.5x crop factor body make it really 1.5:1 ?
12
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4answers
4k views

How can a lens like a 18-55mm have more than one focal length?

How can a lens have a range of focal lengths? Shouldn't it be a single number? Isn't focal length supposed to be fixed for a lens of a particular shape and geometry? What am I missing? How many ...
11
votes
8answers
5k views

Would the 40mm pancake or 50mm prime be better for street photography with a Canon APS-C camera?

I have a Canon EOS 600D, and I already have 18-55mm,55-250mm. I plan to buy a new lens for street photography. I already have picked out one of the following lenses: 40mm STM(pan cake). EF 50mm ...
11
votes
3answers
835 views

Lightroom Upgrade vs Lens Metadata

Adobe Photoshop Lightroom 4 supports new lenses compared to earlier versions. I was hoping that it would change some of my lenses from 'Unknown Lens' to a specific model, but it did not. Synchronizing ...
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)?
10
votes
4answers
363 views

How do you reconcile generally positive user comments with negative comments in a review?

My question was prompted by this DPReview review of the Nikon DX 18~200mm, wherein on page 3 the author reveals some significant sharpness and distortion issues, leading to final assessments of ...
10
votes
2answers
5k views

How can a Frazier lens achieve that massive DOF?

I've read in PetaPixel about this "Frazier lens" that can achieve a massive DOF. In this video is shown the capabilities of this lens and I must say I'm very impressed. How can this lens achieve such ...
10
votes
3answers
14k views

Will lenses from a Rebel work on higher-model Canon cameras?

I am thinking about purchasing a Canon 60D and selling my Rebel XT and wondered if I would need to purchase new lenses? I only have two but as you all know, once you invest it is hard to not take ...
10
votes
3answers
415 views

Are fast lenses only fast when shot wide open?

Given two lenses with different max apertures but the same size image circle (say, full frame on a Nikon FX DLSR camera) and taking shots at the exact shutter speed and focal length under the same ...
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 ...
9
votes
2answers
800 views

Does the size of the front glass mean anything?

Considering the Nikon lenses: Prime lenses: AF Nikkor 14mm f/2.8D ED has a huge front glass (●₃), AF-S Nikkor 50mm f/1.8G has a tiny little front glass, deep inside the body (∙₁), AF-S VR Nikkor ...
9
votes
6answers
320 views

Aside from sharpness & speed, what are the benefits to photo composition\optical quality provided by premium lenses over their cheaper counterpart?

I have gone through quite a few lens reviews and questions on this site that recommend expensive lenses over their cheaper counterparts. From what I've seen in the reviews, there is a marked ...
8
votes
2answers
713 views

Do lenses with the same f-stop but different focal length gather the same amount of light? [duplicate]

I'm taking images of a light source in a scientific labratory, and I thought I had a good grasp on all these things, but now i'm second guessing myself after some results. The most important thing is ...
8
votes
1answer
195 views

Can the sharpness of the lens be evaluated with no relation to the DSLR?

When I read lens reviews, they all say that one lens is sharp, another is very sharp, another one is not sharp at all, etc. For me, it doesn't make sense to just say that a lens is sharp or not, with ...
8
votes
2answers
1k views

Is it normal for there to be tiny dust particles in a new lens?

I'm the owner of a new Canon 550D with a Canon 18-135mm IS lens. While looking into the lens, I noticed what I think are two tiny dust particles (I would say smaller than 1mm) behind the first glass ...
8
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7answers
8k 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 ...
8
votes
3answers
825 views

Cameras using mirrors instead of lenses?

In astronomy, telescopes are most commonly built with mirrors, but there are refractors using lenses. All cameras I know of for Earthly purposes — portraits, landscapes, etc. — use only lenses, not ...
7
votes
2answers
613 views

What's the difference between a wide angle lens and a landscape lens?

Question pretty much says it all. Seems like when I look around people are asking "what's the best wide angle lens for landscape?", but on sites like LensHero they categorize wide angle and landscape ...
7
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4answers
1k views

Where can I rent a camera and lens online within the US?

I'm considering buying a Canon 5D Mark II camera with Canon EF 24-70mm f/2.8 L USM Lens. But before I buy, I would like to rent it to try it out. Where can I rent camera gear online, and have it ...
7
votes
5answers
10k views

Can you recommend a macro lens for a micro 4/3 camera?

I've recently purchased a micro 4/3 camera (Panasonic GF1), and I'm aware that with an appropriate adapter, I can use a large variety of third-party lenses. I'm interested in experimenting with macro ...
7
votes
7answers
2k views

Which lenses are best for macro and for birdwatching (both Canon and Nikon)?

Now I have old Sony A100 DSLR + Minolta AF 24-50/4, Minolta AF 50/1.6, Tokina ATX 80-400/4.5-5.6, ... My camera is old. In near future I am going to buy new DSLR. I think it will be Canon or Nikon. I ...
6
votes
1answer
329 views

Why do lenses have different diameters?

Why do lenses (full frame) have different diameters? Does this difference affect the image circle? Whats the significance behind this? For example Nikon AF-S 70-300 has 80mm diameter and Nikon AF-S ...
6
votes
3answers
4k views

Is the Canon EF 70-300mm f/4-5.6 IS USM suitable for wildlife photography?

I got my first DSLR about a week ago (600d) + af-s 18-135mm kit lens, but I want another lens with greater focal length. So I thought about this lens: CANON 70-300mm f/4-5.6 IS USM How does it ...
6
votes
4answers
283 views

How do I clean the external forward-facing glass on my lens?

How do I clean the external forward-facing glass on my lens? Over the last year or so of use it has accumulated a little dust and a translucent smear mark. Nothing serious, but I'd like to remove ...
6
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4answers
943 views

What should I buy as my first (and initially only) lens to go with a Canon 60D?

I was able to get a great deal on the Canon EOS 60D body and now I have to buy myself a suitable quality lens. Unfortunately my order was later revoked so no great deal for me. Will have to ...
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 ...
5
votes
3answers
523 views

For MTF, why does 10 represent contrast while 30 represent resolution?

I'm trying to learn to read MTF charts. Everything is making sense to me, except why most explanations of MTF will refer to the 10 l/mm line as a measure of contrast while referring to the 30 l/mm ...
5
votes
5answers
577 views

How often should I clean my lens?

You may have read Lens Cleaner Recommendations, and now I would like to know how often to clean my lens. I have been using one lens for about a year without cleaning it yet and recently got a new zoom ...
5
votes
2answers
1k views

Can't auto-focus at full zoom

I have a Canon 1000d, and the standard lens EF-S 18-55mm. Recently I was out taking photos and I've noticed that if I zoom in fully, the lens can't auto focus. I can still take shots using manual ...
4
votes
5answers
4k 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 ...
4
votes
2answers
8k views

What's the difference between Canon EF-S and EF-M?

What is the difference with Canon EF-S and EF-M lens?
4
votes
1answer
674 views

Is Fujifilm's “Super EBC” a modern nanocoating?

In the Luminous Landscape review of the Fuji X-Pro1, Nick Devlin notes: ... how else could one read the “Super EBC” labelling on the lens other than as a nod to the company’s [Range Finder] past. ...
4
votes
1answer
2k views

How to read a lens spot diagram?

How to read such a lens spot diagram?
4
votes
2answers
924 views

Can a fast prime lens simulate a macro lens for food photography?

I read in this thread that macro lenses are considered good for food photography. AFAIK, macro lenses are also used to photograph insects. The lens makes them look giant, and shows up all their ...
4
votes
2answers
302 views

How rapidly does the focal length-equivalent image change by physically moving the camera?

I have recently begun moving from a Nikon APS-C DSLR to the Micro Four Thirds camera while also transitioning from using a viewfinder to using the LCD screen for framing my shots. Because of the size ...
4
votes
3answers
1k views

Do Nikon AF-S lenses perform better than AF lenses?

I am going to be getting a Nikon D7000 soon. I think I'm correct in assuming that the Nikon D7000 will use its own focus motor for an AF lens, but allow the lens to use its motor for an AF-S lens. ...
4
votes
4answers
3k views

Best all-around ~$600 standard zoom lens for Canon?

I have a Rebel T2i, I was wondering what standard zoom lens is the best around $600. I'm mainly shooting landscapes / cities / peoples. I've done some research and came up with 17-50, 18-55 from ...
4
votes
3answers
596 views

How to avoid lens flare?

I often have slight reflections in my lens when the sun (or another bright source of light) is directly in front of my camera. As a result of this effect I had to change the composition of my picture! ...
4
votes
7answers
1k views

What's a Good All Purpose Compact Lens for a dSLR …?

Following on from an earlier post, I've decided to persevere with the behemoth for a bit and see where it goes. It may lead in the direction of a Canon G11/12 or S90/95 - only time will tell. In the ...
4
votes
3answers
533 views

Choosing first lens for Nikon D-90 body

I'm looking to get a prime lens to go with the Nikon D-90 body. I'm looking at 50mm or 35mm and f/1.8 or f/1.4 and AF or AF-S. It appears that VR (Vibration Reduction) is not an option for any of ...
3
votes
2answers
151 views

Fixing chromatic aberration automatically with software

I am trying to fix chromatic aberration in images taken with wide lens industrial cameras. Searching the internet I didn't find a good software to do so. I tried Hugin and a few others, but without ...
3
votes
2answers
1k views

What causes longitudinal chromatic aberration on Nikon 50mm f/1.4D?

I have looked on my new 50mm lens photo (I have Nikon D90) and I see "purple fringing" around the unfocused objects (longitudinal chromatic aberration). What's is going on? Is it common for this lens ...
3
votes
1answer
738 views

Does maximum aperture change with focus distance with the Canon 60mm f/2.8 macro lens?

This site says The Canon EF-S 60mm f/2.8 Macro USM Lens loses 1/2 stop at 1:5, 1 stop at 1:3, 1.5 stops at 1:1.5 and 2 stops at 1:1 (lifesize). Can anyone confirm that at 1:5 magnification, ...