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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4answers
541 views

Does reducing the focal-length using a telecompressor on a lens increase the image quality?

I am hoping that by adding a telecompressor, I will be able to reduce the focal length, thus increasing the image resolution/quality captured by the camera. 1) Is it correct to assume that by using ...
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2answers
1k views

How does camera firmware obtain lens distortion correction parameters?

I use an Olympus MFT system and one thing I notice is that for most Zuiko MFT lenses there is significant barrel distortion as seen in the raw images. However, if you look at the jpg's, often they ...
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1answer
185 views

What part of Canon 50mm f1.4 is responsible for failure to autofocus?

I have the Canon 50mm f1.4 which had the common focus issue due to deformed inner focus ring. I have straightened the ring and the lens now had full range of manual focus, but Autofocus cannot find a ...
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3answers
129 views

Différence between a long lens design and a telephoto

I was looking at the Leitz Hektor and Ken Rockwell says "This is a conventional long lens design, not a telephoto. Its diaphragm sits right at 135mm from the image plane. The Nikkor lens shown ...
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3answers
124 views

Is the sharpness of imaging different within the depth of field?

Is the sharpness of imaging different within the depth of field? Where is the sharpest? What I am asking is the distance from the lens to the object, not the image distance in the lens. How to ...
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2answers
71 views

is using a screw on ND filter along with GND filers which require a holder possible?

I have a screw on 3 - 7 stop variable ND filter which screws on to the lens. I want to buy some GND soft grads which require a filter holder (This holder needs to screw on to the lens). Am I right ...
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2answers
132 views

What means lens optical characteristics?

I have 12-60 Panasonic lens for mft system. I'm about to buy 12-60 Leica for the same camera, because the photos I do with my current lens feel, smartphone-ish. Depite the lenses are similar in ...
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0answers
110 views

Lens stuck on enlarger board/mount

I have a LPL VC7700 VCCE 6x7 enlarger with two Nikon El-Nikkor lenses (50 and 80) that I could easily interchange up until yesterday. Now the 80mm lens is stuck on the lensboard : when I try and ...
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2answers
73 views

Convex lens, object distance, distance, focal length, in what state is the hyperfocal state? [closed]

Suppose we have a convex lens for a middle school physics experiment, a screen, and an object being imaged, under what state will we find the hyperfocal state? The screen is the imaged screen. It can ...
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3answers
638 views

How oily fingerprints affects lens coating in long term?

I recently bought a new camera and got a big finger print on it's lens rightaway. I used lenspen to wipe it off, however my lens pen was already quite dry, so I'm not sure if it worked correctly. I ...
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0answers
70 views

Angenieux 6-80mm Super 8 lens "40/80" knob

I'm new to the world of film. My Beaulieu 5008-s came with the Angenieux 6-80mm f/1.2 lens. About half way up the barrel there is a small knob engraved with "40" along the edge and "80" directly ...
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2answers
355 views

72mm filter on a 77mm lens

I bought some filters a few months ago with a 72mm thread. Now I find myself buying a new lens with a 77mm thread. I have never used step up/down rings before. What the pro and cons of using an ...
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1answer
98 views

EOS-M4/3 Adapter stuck on Sigma Lens?

So I have just bought a new Canon camera and figured my Sigma 24mm 2.8 Superwide lens would be compatible with it, as it is an EF mount. The lens itself was given to me second hand and I had just been ...
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3answers
110 views

Focal length needed to photograph card table

I am attempting to photograph a square card table 35 inches on each side, including some breathing room. I am using a Panasonic G6 with 14-24mm kit lens, at 14mm. On line calculators indicate that ...
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1answer
170 views

"Megapixels" of C/CS mount lenses

So Raspberry Pi got a new camera module and two C/CS mount lenses. Such lenses apparently specify "megapixel resolution", in addition to aperture or focal length. What does it mean? It is quite ...
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1answer
131 views

Which Canon lens to get, EF 24mm f/1.4L II or EF 50mm f/1.2L

I own a Canon 6D Mark II, a Canon 24-105 f/2.8L II. I would like to get a prime Canon lens for portraits that will be mostly full body to group pictures. I have a big family and enjoy taking photos ...
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3answers
434 views

How can I control the aperture of a Nikon G lens when using extension tubes? [duplicate]

Due to corona lockdown, I'd like to try macro photography. I have two lenses (18–55 and 35 f/1.8) and a Nikon D5300. As I currently do not have the money to buy a real macro lens, I found 3 cheaper ...
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3answers
332 views

What is the acceptable CoC (Circle of Confusion) of the human eye to directly observe the object? [closed]

What is the acceptable CoC (Circle of Confusion) of the human eye to directly observe the object? The human eye has many cells and high pixels. Should the permissible circle of confusion be small?
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1answer
102 views

Calculating small projection distance

I'm trying to build a small slide projector but (being a lens noob) I'm not able to get a proper focused image. I'm trying to achieve this: I've got a 20mm (biconvex?) lens with a focal length of 50....
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1answer
101 views

For the formula 1 / u + 1 / v = 1 / f, what is infinite depth of field or hyperfocal distance?

For the formula 1 / u + 1 / v = 1 / f, what is infinite depth of field or hyperfocal distance? In other words, when u, v, and f, we have infinite depth of field or hyperfocal distance?
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2answers
196 views

What does focusing mean? What does it have to do with the formula 1 / u + 1 / v = 1 / f?

What does focusing mean? What does it have to do with the formula 1 / u + 1 / v = 1 / f u is the object distance, v is the image distance, f is the focal length. Does focusing mean that both ...
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2answers
227 views

Is it physically possible to mount a manual EF-M lens onto a Canon DSLR without an adapter?

I'm wondering if you can mount an EF-M lens directly on a Canon DSLR body. I'm aware that electronic communication won't work, but I can use manual focus with electronic shutter. If anyone is ...
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1answer
1k views

What focal length do I need to get the same field of view as an iPhone SE?

I have a FujiFilm camera (mirrorless crop) with a 35mm lens while iPhone SE has a 4mm lens. What focal length lens do I need for it to get the same field of view as on the iPhone SE?
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2answers
145 views

How to fix diaphram of Nikon 14-24mm f/2.8 G?

Somehow one of the nine blades in the aperture of my Nikon 14-24mm f/2.8G has come fully loose and can be seen laying turned sideways when I look through the lens. I don’t want to pay to repair it, ...
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1answer
288 views

Lens keeps on zooming a tad bit and lens error

So my family got a Canon Powershot sx220 HS 9 years ago. It was a great camera and had lived that full 9 years. When we got a new camera and left the camera in its place my dad decided to give it to ...
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2answers
472 views

What is the advantage to not use names, but only descriptions as unique identifier for lenses? [closed]

If I want to buy a new camera, I use its model number to look at review sites and videos, compare photos on photo websites e.g. flickr and search on price comparing websites and market places where I ...
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2answers
427 views

Which should I buy as a starting prime lens, Canon 35mm f2 or Canon 50mm f1.4?

I am pretty new to photography. I have an APS-C camera, Canon 77D with a EF-S 18-135mm kit lens. I want a prime lens for shooting nice bokeh portraits along with street and day to day life photography ...
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2answers
202 views

Why Does the Point and Shoot Have a Greater FOV than the Canon EOS 350D?

I believe a smaller sensor gives a 'cropped' effect so that a scene viewed from a full frame camera will have only a 'cropped' portion photographed by a smaller sensor camera located at the same ...
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1answer
155 views

Sony A6000 with Sony E 18-200 lens: images unsharp on the left, in particular at zoom — lens damage?

My photos, taken with a Sony A6000 with a Sony E 18–200 mm lens, are unsharp on the left at moderate zoom and unsharp everywhere off-centre in severe zoom. This effect is present with image ...
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1answer
729 views

How can I use a disposable 35mm camera's lens on my regular cameras?

I want to use the lens from a disposable 35mm film camera on my regular cameras (Nikon F mount, Sony E Mount, etc). I've been Googling and searching and have not been able to find any material that ...
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4answers
323 views

Will a small format lens focus correctly in a large format camera?

I hope to make a low budget 8x10 large format camera. Lenses are expensive. So will a small format lens focus on the relatively distant image plane within an 8x10? I have just bought a Soviet large ...
2
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1answer
145 views

Sony a7 III vs a7R III + Lenses [closed]

I think this question has been asked plenty of time. Camera? I am planning to buy a Sony FF camera next month and I am confused between buying the a7III vs a7rIII. The price of A7 III is 1455 euros ...
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3answers
660 views

Camera Lense effect on the physical camera

I was watching a video of pixar teaching how physical cameras work. Now two things are important for my question, first the number of light beams that can go through the small aperture and secondly ...
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2answers
480 views

Raw therapee lens/geometry correction Sony a6100

I recently bought my first "real" camera, a Sony Alpha 6100 (Sony ILCE-6100). I select that both, .jpg and .arw should be stored. When I compare the .jpg and the .arw picture the geometry looks a bit ...
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2answers
182 views

Calibrating a lens...is auto focus less reliable when zoomed?

So, I'm calibrating my lenses to a new camera body, a 5D Mark IV. When calibrating my 70-200 ƒ2.8 (version 1), I found that the focus was accurate at 70mm. However, when I calibrated it at the 200mm ...
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1answer
275 views

What is the mount on this Sigma lens? It is smaller than Canon EF

I just got a SIGMA 17-70 1:2:8-4 DC (C) lense. Mount looks very much like Canon EF (S) but it's smaller. Added a foto from a 70-200 EF to compare. Anybody knows what this mount is for? Many thanks in ...
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1answer
186 views

What is the mount on this Beston lens?

Bought this lens cheap at an estate sale, but now I'm trying to figure out the adapter I need to get it to fit my Rebel XS body. I've looked at dozens of pictures on the internet, but cannot narrow ...
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5answers
3k views

What are the differences between these lenses and how will they affect a beginner?

My father is giving me his Canon 50D and Canon EF-S 17-85mm f/4-5.6 IS USM lens. I noticed that most kits on the market come with the EF-S 18-55mm f/3.5-5.6 lens and I'm considering it instead of ...
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4answers
777 views

Wide angle lens vs. kit

I have a 18mm -55-mm 'kit' lens with my Nikon D40. Is it effective as using a 24mm true wide angle lens for indoor real estate photography?
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1answer
414 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 ...
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2answers
339 views

Will the lens for a D30 fit a 5d mark ii, iii, or iv?

Will the lens for a D30 fit a 5d mark ii, iii, or iv? I'm upgrading my mums camera and want to make sure.
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3answers
659 views

What is the necessary recess on an enlarger lens board?

I have recently acquired a Meopta Belar 75mm/f4.5, to use with my Durst M605 enlarger. I was remiss in not checking the mount of this lens (M23.5) before I bought it, and have therefore ended up with ...
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2answers
277 views

Is my Nikon 18-200mm 1:3.5-5.6G lens with broken front glass beyond repair? [duplicate]

My lens broke somehow. I didn't drop it as far as I remember, but the cause of the drop isn't really the point... a part of my lens broke, and my lens cap is stuck to it. Is my lens a goner? Can I buy ...
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2answers
772 views

How much does it cost to repair a dropped (borrowed) 70-200mm f/2.8 lens?

I just dropped a 70-200 f2.8 lens and the images are pretty washed out and blurry. I am really sad about it since I just borrowed it from one of my friends for the weekend. The exterior of the lens ...
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2answers
323 views

Newborn photography - Lens for crop Nikon D7200 [duplicate]

I want to start photograph newborns. But know I am pretty comfused which lens would be good on my Nikon D7200 crop camera.? Everywhere i look for information all suggestions are for full frame camera. ...
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1answer
57 views

Are sensor swabs (used but good, or new) and fluid a good choice for internal element cleaning?

From experiments, it seems that lightly-used sensor swabs (that are NOT contaminated with oils or abrasive particles) make reasonably good internal lens element cleaners and dryers (they are actually ...
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1answer
120 views

What is causing Samsung NX1000 to report "No lens fitted"?

I have a Samsung NX1000. I am getting a no lens fitted sign on the screen. It is the correct lens that came with the camera. The focus also seems blurred. What could be the problem?
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1answer
174 views

How good is the Nikon 70-300mm lens that comes along with the Nikon D5600?

I'm planning to buy a new camera (Nikon D5600) and it turns out that they have two variants. One of the variants come with the usual 18-55mm lens and a 70-300mm telephoto lens. The build as per me, as ...
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4answers
328 views

Second lens after Nikon 16-80 mm: Nikon 50 mm f/1.8g or other? [closed]

I know that comparing lenses is a subjective and often futile effort, but I hope that if I convey my priorities and current understanding (as a relative beginner), I can still gain a lot of insight ...
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2answers
137 views

How will a coating defect affect my images

I have rented an RB 67 and the 90mm lens it came with seems to have a very visible defect on the coating of the front element. How is this likely to affect my images? And what sort of scenes/lighting ...

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