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by Jorge Córdoba

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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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21 views

Is there any risk in removing shims from my Nikon macro lens to make the focus ring easier to turn?

The focus ring/barrel on my Nikon 105mm f2.8 micro lens is extremely tight and difficult to turn. There appear to be several shims between the lens barrel and the focus ring. Is this normal? Any ...
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1answer
267 views

Which lenses can I use with adapters on my Sony A-mount body and what are the disadvantages of such adapters?

I own a Sony A77 APS-C SLT A-mount camera. For someone who likes to experiment and is on a budget, mount adapters are tempting, since they greatly expand the catalog of available lenses and open up ...
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1answer
56 views

What gear for environmental/lifestyle portraits for website

I'm looking for gear recommendations to shoot environmental/lifestyle portraits for promotional/travel photography purposes on a 2 week trip to the wilderness. For most of the time I will be ...
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1answer
29 views

Canon 700d with stock lens or cheaper model with better lens? [duplicate]

I'm torn between getting a 700d kit as it is or a cheaper model (ie. 1200d) with a better lens. Mainly plan on using it for short films. Opinions?
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3answers
118 views

Canon 50mm Macro verus 100mm Macro Lens

I'm considering purchasing either the Canon 50mm Macro or the 100mm Macro with IS. From what I've researched the only real difference is how close you have to be to your object to take the pictures. ...
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1answer
29 views

How do I set a lens profile for post-processing distortion correction with an inverted lens?

Recently I started having fun with macro and micro photography by inverting a lens I have (24-85mm) and by combining 2 lenses togheter (70-200mm + inverted 28mm). The results are good (I shoot in ...
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1answer
79 views

Why don't all zoom lenses have variable f-numbers? [duplicate]

As I understand it, the f-number is a ratio between the focal length and the aperture diameter. A zoom lens can change focal length, but shouldn't the maximum aperture be a fixed size? If so, that ...
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0answers
57 views

Nikkor AF-S DX VR 18-200mm focus stops at 0.9m, can't set it to 0.5m

I have a Nikkor AF-S DX VR 18-200mm and I have a problem with the focus ring. It goes fine from infinity to about 0.9m,then it just stops there and I can't go down to 0.5m no matter how much I turn ...
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3answers
4k views

What can cause black corners in an image?

There are completely black corners in some of my photos. What can cause it? I have a full-frame Canon 5D Mk II and had the problem with my 24-105 Canon lens recently and have experienced it with my ...
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3answers
536 views

What is the limiting factor in lens construction when it comes to f-stop values?

This widely praised Nikon 105mm macro lens has a maximum f-stop value of 2.8. I've held it in my hands, it's a big lens. Meanwhile, this 50mm Nikon lens can go up to f/1.2, despite being 25% cheaper ...
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4answers
3k views

What are the advantages of a lens having a fixed maximum aperture?

What are the advantages of a lens having a Fixed Maximum Aperture? Previous answers have indicated that "pros tend to want constant apertures in zoom lenses". While in general lenses with a fixed ...
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0answers
16 views

Nikon D5300 Vs Nikon D3300 and additional lenses (beginner) [duplicate]

I am going to buy my first "serious" camera. The brand I have zeroed upon is Nikon. Particularly, I am interested in D5300 and D3300 with a price difference of 150 USD. I have heard that lenses matter ...
3
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3answers
538 views

Should a Nikon 18-55 lens zoom automatically?

I have purchased a Nikon D5000 camera with 18-55 from eBay. The lens focuses automatically, but should the lens also zoom automatically or is this controlled manually by the zoom ring.
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1answer
852 views

How do I calculate the ground footprint of an aerial camera?

I have a very simple math problem, but I cannot seem to figure it out. I need to calculate what portion of the ground will be visible when viewed from a UAV mounted camera. I believe I have it solved ...
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2answers
579 views

Why am I getting a “lens not attached” message on my Nikon camera?

I have a Nikon D3100 with the Nikkor 18-55mm lens. Whenever I attach the lens and turn the camera on, its simply saying "lens not attached". The only time it will take a picture is in manual mode and ...
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2answers
925 views

What kind of lens are used in mobile phones?

Usually what kind of lens are used in mobile phones. I mean of the types similar to convex, concave etc.. Are they fixed focal length usually? How do we get the focal length of camera from digital ...
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9answers
911 views

Canon Starter Level Lenses

I would like to get into photography, and I'm thinking about buying a starter D-SLR camera (450D, 500D). Which Canon lenses do think fit to my purposes as considering I'm a beginner and my budget is ...
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7answers
1k views

Lens upgrade paths (sub $1000) for the EF-S 18-55mm IS kit lens for Canon APS-C cameras

This is somewhat a follow-up to my earlier question on the limitations of the kit lens. I have browsed through quite a lot of sites including this one for user opinions & reviews of different ...
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1answer
62 views

Travel lens for LUMIX GH2 [closed]

I am a beginning photographer and own a LUMIX GH2 with the following lens: HD 14-140, LUMIX G Vario 1:4/7-14 (wide angle) and a pancake 20 lens. I am traveling to Europe and need to take a single lens ...
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3answers
114 views

Focusing issues with Nikon 18-35mm f3.5-4.5D on D3200

I have a Nikon D3200 and I have used in the past year and half a 35mm f/1.8 G DX prime lens . I have rented several other lenses and I also have a 50mm 1.8G prime too (I'm sure that some of you will ...
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1answer
40 views

Why is my Sigma 75-300mm lens causing a “there's no lens” error on my alpha mount Sony?

What can I do to get my Sigma 75-300mm telephoto lens to fit my Alpha mount Sony? The lens will attach but the camera says "there's no lens". I used this lens on a 7000 Maxxum 35mm film camera.
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3answers
1k views

How far away can I be and still get a sharp subject with a 100mm lens?

If I have a 100mm lens, how far away can I shoot the subject? If I am shooting basketball, how far can I shoot the subject and still get a sharp picture?
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2answers
7k views

How to calculate the FOV in degrees from focal length or distance?

How does one to calculate the field of view (or angle of view) in degrees from the following details: sensor size (for example, 1") distance to target (for example, 7 feet) focal length (for ...
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5answers
12k views

70-300 vs 55-200 for a Nikon D3200

I own a Nikon 18-55 VR and a v 55-200 (no VR). I love zooming as much as I can, but I have a very limited budget. I am not a professional, so I am learning through experimenting with my camera. An ...
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3answers
1k views

What are the advantages and disdvantages of the Canon 18-55 IS MKII vs IS STM kit lenses?

I'm trying to figure out the difference between the IS MKII lens and the IS STM lens. Specifically, I am looking at the Canon EF-S 18-55mm f/3.5-5.6 lens. On that Amazon page, there are three ...
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2answers
210 views

Can add-on lenses for mobile phone cameras improve the image quality?

I have an iPhone 5s. I wonder if using an additional lens increases the image quality or not. Or does it just help in zooming?
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0answers
102 views

What is the best lens to shoot the Milky-Way on a crop camera? [duplicate]

I own a Canon 100d and i like to photograph the stars, I'd like to have a wide angle lens to capture the most of the milky way i can. Possibly as cheap as possible and have really good quality. Thank ...
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3answers
190 views

Why did manufactures stop including DOF scales on lenses?

Seriously why? I hate it and I hate memorizing it or check my phone app for the depth of field of the current aperture. I find it so useful in old lenses. The DOP preview doesn't help that much (IMO) ...
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2answers
166 views

Difference between Canon 18-55mm IS II and IS STM? [duplicate]

I am a newbie into the photography world and would like to buy a DSLR. I am currently shooting with my phone and usually take photos with auto mode. While choosing for a camera I have narrowed my ...
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1answer
101 views

What order to use range extending tubes in and the effect on aperture

I have a 500mm mirror lens, at f/8. I have 2 hollow tubes (their order wont matter) and 1 tube which is a "Vario converter" and can be rotated from 2x to 3x (this moves a lens about 1cm along) I ...
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6answers
3k views

Is an EF 50mm f/1.4 the same as 50mm with an EF-S lens on a Canon 550D?

I have a Canon 550D with the standard 18-55mm kit lens. The 550D has a 1.6× crop factor. My question is very simple but whenever I've asked before (Yahoo Answers) I always got overly-complicated ...
14
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4answers
21k 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 ...
2
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4answers
577 views

Why is my Canon 55-250 IS lens blurry at focal ranges beyond 100mm?

I recently purchased a used Canon 55-250mm IS lens and it works nicely at 55mm(even with lower shutter speed, and f/4 aperture), but turns out quite blurry at longer focal lengths, even with a shutter ...
1
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1answer
122 views

Does lens resolution matter when it comes to high resolution sensors? [duplicate]

I've recently seen the news about Canon's 5ds and 5dsr with their 50mp res sensors. Now I've read on some other forums that you would need some L lenses developed recently ( 5 years) or those woth ...
5
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1answer
158 views

What prevents a f/1.8, 24 mm - 70 mm or similar range zoom lens from being made? [duplicate]

I see that it is common to have professional grade lenses such as 24-70mm lenses made at f/2.8. After using a 50mm/1.8, I was wondering what would prevent a more versatile zoom lens to be made that ...
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2answers
175 views

Why do camera phones have lenses of inferior quality?

I've heard that mobile phone cameras have lenses of inferior quality to those in DSLRs and point and shoot compact cameras. Is this true, and if so, why?
1
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1answer
63 views

Why doesn't the zoom ring on my Vivitar 75-205mm lens turn?

I bought a Vivitar 75-205mm zoom macro lens for Minolta MD yesterday without paying much attention to the seller's details: I bought it as a gift to someone important for me. She only has a 35mm ...
21
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8answers
2k views

How long should a lens last?

There are loads of ratings and tests for how long DSLR bodies last, but I have never really seen much that describes the expected lifespan of lenses. Recently, one of my cheap-o lenses (Nikon ...
1
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1answer
113 views

Why do I get blurry pictures when I take a lens attachment off?

I bought a Canon D3300 bundle. This is my first dSLR. It came with a couple lenses. On Easter, I decided to use a wide angle lens to get all the action. Now I can't use my camera without this lens ...
1
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2answers
104 views

Old SLR Sigma 18MM on a DLSR Canon

I've bought a Sigma 18MM 3.5F Ø72mm Autofocus for a Canon SLR. The thing is that I've got a Canon 40D so I made a mistake I think. The lens only works when setting the aperture on 3.5 any higher ...
3
votes
2answers
2k views

Nikon 50mm FX as general-purpose lens on DX?

I have a Nikon D5100 with the excellent 35mm 1.8 (DX) prime lens and am now looking at the 50mm 1.4 (FX). This is (according to my research) a 75mm equivalent on a DX body. Does anyone else have ...
12
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6answers
27k views

What is the difference between a telephoto lens and a zoom lens?

Looking at the product page for Nikon lenses, I notice a distinction between telephoto lens and zoom lens. What is the difference between the two? Why would I want one over the other? I wiki'd ...
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3answers
161 views

Equivalent focal length and aperture of 150mm medium format lens on a 35mm camera

I'm mounting a Hasselblad Sonnar C 150 mm f4 on a 35mm sensor (43mm diagonal) camera. What is the calculation to get the new angle of view and equivalent focal length? Does this also affect the ...
2
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2answers
8k views

How do I fix a stuck zoom ring on Nikon 18-55mm AF-S?

I have a Nikon D3100. The zoom ring on the lens that came with the camera is stuck. The lens is a AF-S NIKKOR DX, 18-55mm. Is is broken, or just stuck and is there anything I can do "unstick" it. ...
13
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7answers
661 views

Does lens speed still increase meaningfully when the physical aperture is larger than the sensor size?

This question came to me this morning, thinking about 50mm lenses. I have the Pentax 50mm f/1.7 (manual) and it's a very nice lens, but would be considered (relatively) slow on 35mm film, and many ...
2
votes
1answer
2k views

Nikon D3200 does not recognize the Nikkor AF-S 50mm 1.8G

I bought a new Nikkor 50mm AF-S 1.8G to add to my Nikon D3200, however, it will not recognize the lens. It says "Lens Not Attached" in all modes with error "NON CPU lenses can only be used in manual ...
1
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1answer
65 views

Why can a lens still function when subject to severe physical degradation?

Consider the following two modifications to a camera lens: Obstructing the about 75% of the lens's front element with an opaque filter as shown here: https://www.youtube.com/watch?v=43W159gPpdQ. ...
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2answers
91 views

Nikon D5100 says “lens not attached” in automatic mode (works in manual) [duplicate]

I'm a total beginner with my Nikon D5100 and i'm trying to shoot in auto mode. When I attach the AF-S Nikkor 18-55 mm lens, the camera says "lens not attached" unless I have it in M (manual) mode. I ...
3
votes
5answers
9k views

Why do some people prefer 50mm to 35mm prime lenses, even for a crop sensor?

Comparing the two lenses for an APS-C sensor: EF50mm f/1.8 EF35mm f/2 here Leaving out cost as a factor, EF 35mm has the following advantages: 43 degree while 50mm has 31 degree Its equally ...
1
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1answer
114 views

What is the main difference between the Nikon 55-200mm VR lens and the newer version the VRII?

Despite the obvious differences, price and weight, what is the main differences between these two lenses? Nikon 55-200mm VR f/4-5.6 - 334g ~€150 Nikon 55-200mm VRII f/4-5.6 - 296g ~€300/350.