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Questions tagged [lens]

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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What do the F and f numbers written on lens mean?

On this particular lens rim is written "F:2.6 f=3.8mm". What does it mean? Focal point 3.8 mm and aperture 1/2.6 of the focal point ???
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4answers
650 views

How can I take undistorted overhead top view pictures of a stationary gas compressor?

I need to take overhead top view pictures of a stationary gas compressor. How can I get the image to appear flat by adjusting the focal length? Example: I need to know what type of lense or camera to ...
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1answer
126 views

How to diagnose old Canon EF 35-105mm lens with autofocus motor too weak to reliably rotate lens barrel?

I bought a couple of old Canon EF lenses and they are very slow at autofocusing on my 350D. The worst offender is the EF 35-105mm f/4.5-5.6 USM. This lens regularly gives up moving the barrel after a ...
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1answer
142 views

How does a Canon FD to Micro-Four-Thirds adapter change the image?

I have a Lumix G7 and want to use a Canon FD lens with it (mostly because of the incredible price). The FD lenses I have in mind are the 28mm F2,8 and the 50mm F1,4. I know that the focal length ...
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1answer
118 views

Can a non-AF lens be used on a Canon 1000D AF camera? [duplicate]

Can I use a non-AF lens with a Canon 1000D AF body. Canon lenses use in-lens motors for focus, and the only connection is electrical, so I don't see why not. What type of mount and lens should I look ...
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2answers
2k views

What do these curved, color-coded lines mean on a vintage Nikkor lens?

This lens, a Nikkor 80-200 AIS, has some curved lines that are color coded to match the aperture ring. Originally I thought this was for focusing but playing around with it does not make it seem like ...
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2answers
3k views

Can I use a Speedbooster with a Canon EF-S DSLR?

Could you please give me some advice about a speed booster? I have a Canon EOS 750D. Lately I have been taking quite a few night event photos. I do not have a fast lens (and can't afford one) and my ...
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2answers
179 views

Are there adapters so I can use my lens converters on a Canon entry-level dSLR?

I have: Kenko Video Tele Converter KVC-20 II 2.0x XIT Elite series 3.7x AF telephoto lens Digital Optics Japan 0.45x Pro Definition with Macro lens Are there adapters for these which would fit my ...
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5answers
816 views

How to maximize the blurred background look with a distant subject (for example, 10m away)?

What lenses do I need in order to achieve the amount of bokeh that's on the image below? I am quite new to dslr photography, and I want to buy a new lens. My main objective is to get strong bokeh ...
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1answer
1k views

What does it mean when a Nikon camera returns an fEE error with several lenses that do not cause the same error on other Nikon bodies?

Here's a curious situation hopefully someone can shed some light on. I have a D750, an obsolete D100 (metaphorically) gathering dust, and the following lenses: AF Micro Nikkor 60mm 1:2.8 D lens = ...
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2answers
94 views

Sigma DC 18-250mm Macro HSM Lens Autofocus not locking to let me click the picture

I was travelling on a trip with my camera. One day I was using my Sigma DC 18-250mm Macro HSM lens on Canon 70D in autofocus mode to take a picture. When I pressed my shutter button halfway to focus ...
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4answers
294 views

Given aperture and focal length, what is the minimum distance for maximum resolution? [closed]

I'm going to describe a physics experiment involving imaging a proton beam using a CCD camera by reflecting it on a aluminium oxide surface, and we need some help about how close the camera should be ...
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3answers
133 views

What does the value of 'exit pupil' represent on a lens datasheet?

On this datasheet of the Kowa LM25HC lens I have access to, there is a number called exit pupil, which equals -57.9 mm. What does this number represent? This is not a question about what the exit ...
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1answer
335 views

What is this breech mount with three flanges and a single linking pin?

I bought this Vivitar lens cheap and I'm having trouble identifying the mount. I believe it's a Version 4 Serial number is 22128668
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1answer
41 views

Replacement lens-board ring name and sourcing

I've been having a hard time buying a good large format lens from eBay. I'm on my third order and the lens looks great, but it's missing the small ring that tightens the lens to the lens board. I'd ...
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3answers
323 views

How to take photos of planets with smartphone?

I'm not sure if this the right forum to post this question. I'm trying to find what is the best option to take photos of planets using smart phone. I have a Google Pixel XL, and I'm looking for a good ...
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3answers
655 views

Can I force the aperture to stay open on macro lens?

I have a sigma 180mm f/2.8 lens, which I bought because it was the largest aperture I could find that focuses around 0.5m See this question for why this was important.. Upon arrival, however, the lens ...
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2answers
325 views

Can I use new “designed-for-digital” Leica lenses with a Leica film body?

I'm planning on buying a Leica film body. However, newer lenses are much easier to find. Presumably, newer lenses have been designed for digital bodies. I read that the new Leica lenses for M mount ...
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2answers
975 views

My DSLR's autofocus doesn't work after I dropped it — how can I narrow down the problem?

If I try to focus by the shutter button the image doesn't change, even in live view (and I'm not be able to shot a picture). But if I hold the "AE-L/AF-L" button and click the shutter button I'm able ...
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3answers
250 views

Can I use a Smena lens on a Nikon DSLR body?

I found an old Soviet-era camera: Smena with T(Triplet)-22 4.5/40 mounted lens. I'm really curious about whether there is a way to mount this lens on a Nikon D3300.
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1answer
174 views

What are the differences among the various Rodenstock Sironar lenses?

I am hoping to buy a used 210mm Rodenstock Sironar N, which I understand is the same as an Apo-Sironar N. But I see a Rodenstock Sironar for sale on eBay, with no letter following. Where does that ...
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3answers
816 views

Is there any adapter to mount older Canon EF lenses on a newer Nikon DSLR? [duplicate]

Before the question, here’s some background story: My uncle just brought me his old Canon EOS 100 that he cannot use anymore because there is nowhere where he can develop photos. I am not going to use ...
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1answer
166 views

Why doesn't UFRaw automatically find the lens profile for one of my lenses, even though it's in the database?

When I open a raw image, made with a Canon EOS 600D, UFRaw for some lenses does not automatically find the lens profile. This is an example where it does find the profile: From the EXIF information: ...
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1answer
234 views

Manual focus lens on fixed focus camera?

Hello i have bought this camera: It is a lens type camera, but it has a FIXED focus. I read on the internet that if I buy and put a manual focus lens it will work? Is that true ? If it is true ...
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1answer
4k views

Is there a way to remove fungus without dismantling the lens?

I own a 1983 Minolta 35-105 lens which has a minor case of fungus on what I deem the second element (the first glass behind the outer one) The fungus seems to be growing, if only very slowly. As ...
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3answers
335 views

Is there any way of dealing with or reducing lens vignetting with a wide angle?

So I finally got around to purchasing a Nisi 150mm filter holder and a couple of filters for my Samyang 14mm AF lens. Seems fine so far except that the holder itself causes some vignetting, with part ...
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2answers
3k views

What are these clusters of branching structures on/in my lens?

I packed a Tamron 28-75 lens away for over a year. When I took it out of storage examined it, I found clusters of branching structures on or in the front element. I Took it to a camera store and they ...
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2answers
282 views

Is this a bubble in my lens element?

Both images show the same artifact.
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2answers
392 views

What is the cause of inclusions in my bokeh?

I was doing a lens review an two of my lenses showed these rather unsightly inclusions in their bokeh. There are two different lenses. EDIT: The third lens I have tested also seems to have this ...
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2answers
111 views

How would this fare as a makeshift polariser for somebody on an extreme budget?

This 150x150 polarising filter sheet/gel After having contacted the seller, they said it's something people often use in photography? I'm assuming it wouldn't be anywhere near as useful as an actual ...
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4answers
293 views

Distance-creating “lens”?

On another recent question I noted that it's theoretically possible to take "short-range" pictures that have the perspective as if they were taken at a distance, by means of a system of mirrors: To ...
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1answer
2k views

Why isn't a Sigma HSM lens autofocusing with my Nikon D5600 — is there a compatibility problem?

Today I had a chance to try a Sigma 70-200mm f/2.8 EX DG OS HSM, a 2013 model lens, on my Nikon D5600. Everything was okay. I was able to take pictures with it. But auto focus didn't work as it should....
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2answers
132 views

Why do camera bodies and some lenses both have autofocus / manual switches?

Why is it that lenses come with an AF option when the camera has the same? Which controls the AF? One would think that they contend with each other for control. Why have two entities doing the same ...
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2answers
3k views

How can I get headshot portraits with pleasing, natural perspective if I'm constrained to a short distance?

I know in a portrait photo we use distance between camera and the subject in such a way as to create a pleasing and hopefully natural-looking perspective. I think it's good on 1 ~ 1.5 meter to get a ...
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3answers
229 views

If I buy certain-sized filter system, for example a 150mm holder, which size filters can I use for it?

Would they have to be strictly 150mmx150mm holders? Or could they also be rectangular, such as 150mmx100mm for example? Sorry for the basic question - I'm pretty new to filters and its peripherals.
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0answers
60 views

Will the Camdiox brand 165mm fit with the SFH-14 filter holder for the Samyang 14mm lens? [duplicate]

this is an example of one of the filters - Camdiox 165x208x2.5 this is the filter holder - SFH-14 filter holder designed specifically for the Samyang 14mm lens. I was put off this specific filter ...
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2answers
1k views

Canon 50mm f1.8 vs sigma 17-50mm f2.8 [closed]

I wish to buy a second lens. which one should I buy? I was thinking to buy a canon 50mm f1.8 as suggested by many youtube videos but then I thought why not take a zoom lens (a sigma 17-50mm f2.8?) by ...
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2answers
1k views

What are the most suitable filter holders for my Samyang 14mm autofocus prime lens? [duplicate]

I've looked into the ones from Haida and Nisi which are both suitable, though they're quite pricey for me currently - does anybody know of any cheaper possible alternatives? I understand there's the ...
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2answers
157 views

I have a telephoto lens made to screw on to another lens. Which one should I attach it to?

I have a prime lens, a zoom lens and a telephoto lens. My Telephoto lens is made to screw onto another lens. Should I attach it to the prime lens or does it matter?
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2answers
505 views

Why is my Canon EF 85mm f/1.4L IS USM lens making a ticking noise?

My Canon EF 85mm f/1.4L IS USM lens is making a noise I never heard before. It takes pictures and focus as usual but produces a constant ticking noise when the image stabiliser is turned on.
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1answer
168 views

Lenses with 3 meter image circle?

I’m building an ultra large format camera to take sheets of photo sensitive paper up to 3 meteres wide, although will start shooting with paper 2.4m x 1.2m. If there any exisiting lenses that can be ...
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1answer
549 views

Will the Lee 100mm filter holder work with a Samyang 14mm autofocus lens?

Will this Lee 100mm filter holder work with a Samyang AF 14 mm F2.8 Autofocus Lens for Sony FE? Which adapter ring would I need to buy for it? Thank you, and apologies if any of this comes across as ...
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3answers
251 views

I have the Samyang FE 14mm lens which has a nondetachable lens hood - is it possible to still use a ring adaptor on this so that I can use a filter?

And how would I know which size adaptor I need? There are no markings on my lens. I'm looking into buying a square filter holder to try help with this. Thanks.
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1answer
100 views

How different lenses affect photo quality? [duplicate]

Suppose I have these two lenses: - Tamron SP 24-70mm f/2.8 Di VC USD G2 Lens - Tamron 28-300mm F/3.5-6.3 Di VC PZD And suppose I have used them both on the same full frame camera, in the same tripod ...
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2answers
3k views

What's the equivalent of a 85mm portrait lens on Sony A6500 (APS-C)?

When conventional wisdom refers to 85mm as the perfect lens for portraits, it refers to 85mm for a full frame sensor. Is this right? In that case, is it correct to apply the crop factor and say a 55mm ...
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3answers
2k views

Cleaning the rear element of a lens?

I just purchased a used Tamron 45mm lens, and its rear element is a bit dirty. Am I allowed to clean the rear element using microfiber and lens cleaning solution + lens cleaning tissue?
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7answers
4k views

How to know you've outgrown your equipment?

I have only started shooting recently, as a hobby. I use Canon EOS M100. I use a EF to EF-M adapter to use EF 50mm f/1.2L USM. The camera seems to have trouble focusing and light metering (with auto ...
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2answers
186 views

Why is the aperture of this old lens showing as centered blue glare?

I just bought a old Minolta MD Zoom 35-135mm 1:3.5-4.5 lens together with two old Minolta SLRs to get into film photography. Before using actual film I adapted it to my Canon 600D (using a no-name MD-...
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3answers
632 views

How do I choose a lens for a “glow in the dark” indoor/lowlight event?

I was recently asked by a friend to take to pictures at a “Glow in the dark” event center meaning that it’ll consist of low light environment. I have a 320 EX III speedlite that I can use, but I would ...
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2answers
142 views

Can using a high resolution sensor and downsampling compensate for a soft lens?

In this question Does super-sampling produce good results? the difference in quality between using a high and low resolution sensor of the same size and then downsampling the high resolution one gives ...