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.

Filter by
Sorted by
Tagged with
2
votes
1answer
86 views

Aperture Doesn't Change on Nikon D7000 1.8D (Already set ring to 22)

I have a Nikon D7000 and I recently purchased a used 50mm f 1.8D for it. I am unable to get the aperture of the lens to change. It seems to stay stuck at completely open version of the lens (1.8f). ...
0
votes
2answers
525 views

Why don't my calculations based on a crop factor of 1.5 work for the Nikon P1000?

I know that Nikon cameras APS-C sensors has a crop factor of 1.5 but if we apply this to calculate the equivalent focal lenght in 35mm format for the Nikon P1000 camera we will not get the exact ...
0
votes
1answer
207 views

Camera sensor and sun

I'm a new photographer and yesterday someone told me that I should never point my camera (I have a mirrorless camera) toward the sun as this can damage the sensor. I went back and checked and I saw ...
0
votes
1answer
38 views

How do older AF Nikkor CPU lenses measure the selected aperture to provide data for the camera?

I have a semi-faulty AF Nikkor 50mm ƒ/1.8 lens (early non -S or -D model, with the focus distances in a little window) that has been having issues communicating with the camera. Both my F-801 and my ...
14
votes
5answers
36k views

What does the f-stop printed on the lens refer to?

I have read this,so I know what an f-stop is, but what does the number on printed the lens signify? Is this is the maximum f-stop, the ideal, or something else?
1
vote
4answers
132 views

Decrease FF lens focal length for use on APS-C and still have it focus?

Need to convert very cheap vintage FF 50mm f/2.8 lens to work as 35mm lens for for APS-C, for having wider angle of view. Its kind of works by simply placing lens closer to camera sensor (without ...
1
vote
1answer
2k views

E-mount lenses to A-mount bodies?

Is there such a way to adapt E-mount lenses to A-mount bodies? If not is there a reason this can not be done? If there is such an adapter can you recommend an adapter to me?
1
vote
3answers
140 views

Does the focal length on cropped lenses include a crop factor? [duplicate]

I'd like to be certain about the focal length written on the cropped lenses, e.g. I have a Sony NEX-5N with the original OSS 18-55mm kit lens. Is it actually an 18 to 55mm focal length with no "...
42
votes
10answers
35k views

What are the dangers of removing a lens while the camera is on?

The manual warns that you should turn the camera off to remove the lens, but it doesn't say why. I suspect this may have to do with dust, but I could imagine there are lots of other reasons. I'm ...
3
votes
6answers
3k views

Do smartphones suffer from degrees of chromatic aberration? If so, how is it possible?

Smartphone imaging sensors are usually Bayer sensors which have a color filter array on top of each pixel, so each pixel ultimately captures one of red, green or blue colors of light. In that case, ...
4
votes
2answers
3k views

How do you find the nodal point of a lens?

When shooting a panorama, rotating the camera & lens about the nodal point of the lens is expected to produce higher-quality images (in the sense that they match better at the edges) -- hence the ...
3
votes
1answer
419 views

Troubleshooting constant whirring sound from 70-300mm Canon Lens

I have a Canon Rebel XTi with a 70-300mm lens. About 6 months ago, it started making a constant whirring sound every time I connected it to the camera. The whirring sound occurs even when the camera ...
4
votes
2answers
2k views

Origin of the sound / noise made by some stabilized lenses?

It has been reported that some lenses with VR (Vibration Reduction), IS (Image Stabilization) and lenses with OIS (Optical Image Stabilizer) produce some noise. On Canon and Nikon lenses, noise ...
6
votes
5answers
965 views

What are the summary rules for when to use image stabilization and when not to?

When I got my DSLR, I took a lot of pics and all of them came excellent, even though I had VR at the "Off" position. Since those came out so well, I wonder when should I turn VR on, and when I ...
3
votes
2answers
1k views

Sony A6000 blurry in peripherals despite sharp center -- is this a mirrorless thing?

I used to have a mirrorless Sony Alpha A6000 camera. The problem I had with it was that, no matter how hard I tried to keep the center of my photos sharp, my photos always looked blurry in the ...
13
votes
6answers
17k views

Does change of lens affect a camera's megapixels?

I have a Nikon D40. It has only 6.1 MP. I am planning to buy additional lens for it. Can changing the lens of the camera increase or decrease the megapixels of the camera?
1
vote
2answers
692 views

Kit lens on an Olympus OM-D E-M10 Mark II not being recognized?

I have an Olympus OM-D E-M10 with the kit lens, which reads Olympus 14-42mm 1:3.5-5.6 EZ ED MSC 0.2m/0.66ft-∞, and for some reason today, when I turn it on, the lens goes in and out (zoom) ...
2
votes
2answers
100 views

What’s wrong with my Canon EF 85mm 1.2 lens?

It squeaks when I try to focus and sounds like metal against metal. And it won’t focus on Manual mode. The outside is in great condition but the ring for focus is loose and wobble's. It’s like it is ...
3
votes
3answers
571 views

Is aperture the same on different format of lenses?

I have just acquired a large format lens (a Schneider-Kreuznach Angulon 1:6,8/90) for the first time, coming from 35mm and medium format, and I am a bit puzzled by its aperture. I want to make sure I ...
1
vote
2answers
358 views

Help! Auto-focus not working on Manual Mode but working perfectly fine on Auto Mode

I just bought and received a brand new Canon EF 24-70mm II USM lens. Already there is an issue. The autofocus works perfectly fine in Auto shooting Mode but will NOT work in Manual shooting Mode. This ...
0
votes
2answers
234 views

Can taking up-close photos of multiple candles stacked together damage my iPhone’s camera/camera sensors?

My brother took multiple up-close pictures of a stack of burning diyas (a type of candle); to the naked eyes, the candles looked very bright. Can such up-close photography damage my iPhone’s camera, ...
3
votes
4answers
11k views

How to remove oil from aperture blades?

If you go on ebay or other second hand places, you'll see a fair amount of lenses that have oil on the aperture (particularly on older lenses). I've done some reading and it looks like this oil is ...
2
votes
2answers
2k views

Sigma HSM lens won't focus on Nikon D5300

I tried the Sigma 70-200mm 1:2.8 Macro HSM EX DG APO on my Nikon D5300 and it won't autofocus even though the lens is supposed to have a built-in motor. I've checked the camera settings to make sure ...
1
vote
6answers
6k views

What pancake lenses are available for Sony NEX camera?

As a DSLR owner, I am currently looking for a compact interchangeable lens camera and I currently hesitate in buying the Sony NEX-5N or the Panasonic GX1. I realize the lens options for the Micro ...
0
votes
0answers
23 views

Samyang 10mm F2.8 UNKNOW ADAPTER? [duplicate]

I want to use this Samyang 10mm F2.8 lens on my fujifilm X mount camera. What kind of adapter I need to mount on my fujifilm X mount? Was used with a sony nex adapter: After a searching on the ...
0
votes
1answer
56 views

What are these focal lengths for Sigma Nikon Optimization Pro for 14-70mm F2.8 OS HSM A017?

I've been calibrating my Sigma lenses using the Sigma Optimization Pro application and the doc hub, for instance, the 24-70mm F2.8 DG OS HSM A017 Nikon version. In order to do so, I take photos at ...
10
votes
2answers
8k views

Is image stabilization a necessary feature for wide angle lenses?

I am considering buying a 24-70mm lens, and among third-party lens makers, Tamron makes a 24-70 f/2.8 with optical image stabilization (vibration control, in Tamron's terminology). Is it really ...
4
votes
3answers
3k views

Canon EOS R or R5 with EF-S lens

Next month, I will buy a canon EOS R5 for concert photography. I will be short on money for some months or even a whole year because of this investment. I have a lot of EF-S lenses and some EF lenses ...
2
votes
2answers
108 views

Using a MFT mounted lens on a full frame camera

A long time ago, I bought 4 Rokinon Cine DS lenses with the MFT mount for my Panasonic GH5. Link to one of them is below. https://www.amazon.com/gp/product/B00MZCCDA6/ However, since then, I have been ...
0
votes
1answer
178 views

What are the lenses with FOV 90-100 degrees for 23mm diagonal sensor ? and their mount name?

What are the lenses with a FOV 90-100 degrees (approximately) for 23mm diagonal sensor ? Is there any norm name for this kind of sensor or any named mount, to which is associated image-circle and ...
3
votes
4answers
35k 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 ...
1
vote
1answer
581 views

How to identify the original manufacturer of lenses branded Focal (Kmart)?

There are Focal-branded lenses for which I wish to identify the manufacturer. I have read that Focal is the Kmart house brand for optical equipment (cameras, lenses, binoculars, etc). They also ...
1
vote
2answers
212 views

Canon 60D accessories fit to 6D mark 2?

I am a beginner of photography. I bought second hand canon 6D mark 2. I wonder if all those lenses and accessories of canon 60D are capable to use for 6D mark2? If those fits, I will buy those full ...
1
vote
1answer
144 views

A spot on the lens inside the camera

Hello! Is there someone who has experience with this kind of "spot-on-the-lens" stuff? :) I bought a used 35 mm camera and discovered a "spot" on the lens inside. Of course, it ...
1
vote
2answers
136 views

Does it exist?: a Coronagraph-style LCD panel mask inside the optical lens to pass dark and block bright pixel segments?

So we know coronagraphs are just a circular mask in the center of a telescope to block the sun's bright light and allow our eyes to see into the dark around the sun. But what if this coronagraph could ...
6
votes
3answers
5k views

What lenses can produce a clean starburst effect?

I have seen several examples of a beautiful lens effect, naturally due to a stopped down aperture, but not like a lens star I have managed to create myself - it is so clean. Here is an example: https:...
2
votes
3answers
178 views

How can I remove spots on my lens?

I have noticed there are lots of spots on the outside of the 1st optical lens on my Ef-S 18-200mm lens. They are not scratches and look more like marks left by dried condensation or water droplets. ...
0
votes
1answer
112 views

Is a Nikon AF-S Nikkor 50mm f/1.8G lens compatible with a Nikon D3100?

Can I use autofocus in Nikon D3100 body with Nikon AF-S Nikkor 50mm f/1.8G lens? If possible then how? I have recently bought one but can't use autofocus. The camera is showing me lens is not attached....
1
vote
0answers
179 views

Motion tracking/VFX: How to get needed info for iPhone camera?

Basically, I want to do VFX with my iPhone SE 2nd Generation front-facing camera. The software being used is Blender up-to-date. I'm not sure what to set Blender for in the track camera settings field,...
0
votes
1answer
59 views

M50 Mounting maximum weight [duplicate]

I have a canon m50, and an adapter + 55-250 f4 lens, the total weight of the lens and adapter is 500gram, is it safe to install a tripod on the camera body, because my mount adapter is broken
1
vote
3answers
4k views

What does a megapixel designation on a lens actually mean?

I know that in a CMOS sensor the megapixels give you an idea of how many pixels are actually there to capture the light. In terms of a lens however, I cannot find any relation between the megapixels ...
2
votes
1answer
243 views

Canon 6D Mark-ii + Kenko C-AF 1.4x Teleplus pro 300 + Kenko 1.4x teleplus HD shows Error

I have a Canon 6d mark-ii camera. However, the kenko lens are not working and yesterday, I tried to fix my camera with a friend. They had the same camera and lens but those are working with mark-ii ...
1
vote
3answers
247 views

Are there any wide angle lenses that will work on the NIKKOR 1 to give about 24 35mm equivalent?

I like the look of the NIKKOR 1, but wish to have the option of a real wide angle len. Can I get one at a reasonable price by using mount converts etc?
2
votes
4answers
2k views

Will a macro extension tube eliminate the cropping of an APS-C lens on a full-frame sensor?

I understand using an A-mount lens intended for APS-C sensors on a full-frame camera results in cropping of the image. According to a tech at Sony, you lose 1/3 of pixels (APS-C is a 2/3 sensor so it ...
2
votes
4answers
416 views

What are the technical reasons to design lenses with oddly shaped apertures?

Some lenses have oddly shaped apertures, like star or shuriken shaped. It seems to be intentional since making "normal" rounded or polygonal apertures is fairly simple (as I have observed while ...
2
votes
2answers
210 views

What is this 25-100mm lens with a 1 inch diameter mount?

I am trying to identify the brand/make/model of this lens. It has a thread mount, 24mm as I measured it. It has two zoom barrels and no manufacturer name stamp I can see, although it has 'lens made in ...
8
votes
6answers
9k views

What CCTV lenses can I use with Micro 4/3 and adapter?

I keep hearing things about using CCTV C Mounts hacked into a Micro 4/3 camera using an adapter. Does anybody have any experience with this? Can any ebay lens work, or is the C-mount not universal? ...
0
votes
0answers
88 views

Choose lens for Olympus OM-1n

I just got an Olympus OM-1N since I decided to play with analog photography. It came with the regular 50mm f/1.8 lens which is quite fine for many occasions, however I realized that I need a wide-...
7
votes
2answers
354 views

Can any MFT lenses be turned into a practical object-space telecentric macro lens by reversing?

The micro four thirds specifications originally want lenses to be image space telecentric if possible. It seems that some MFT lenses actually follow that recommendation. Can reversing such a lens ...
8
votes
1answer
1k views

What are these strange lines that are visible at sunset?

I see those lines, you see on the picture, on my iPhone 7 jumping random on my display while taking pictures. It was sunset right in the sea in Zakynthos. I would like to know what that is.

1
2 3 4 5
59