All Questions
25,793
questions
0
votes
0
answers
4
views
Why does Hugin stitch two pictures the wrong way with big steps?
When trying to stitch a picture of a car out of two photos, I always get a wrong stitch with well-visible "steps", especially on the left rear lights:
I've tried fiddling around with the ...
- 421
0
votes
0
answers
33
views
Best camera for filming rain [closed]
I want to film two types of YouTube video:
Non moving shot, relatively close up. E.g under a lamp post capturing each failing droplet.
Virtual walk.
Are there specific cameras that will let me ...
- 101
0
votes
1
answer
76
views
Rejected US Passport photo which passes the test of travel.state.gov 's photo tool
I need to upload a digital US passport-style photo to my online account at USCIS. When I upload my photo there it gets rejected by the system. It says
''Your photo did not pass photo requirements. You ...
0
votes
1
answer
58
views
Will a professional PL s35 anamorphic lens cover a fuji sensor and provide proper squeeze?
I have a fuji x-mount camera which is aps-c. As far as I understand it aps-c is just about the same size as super35, and I can buy a PL mount adapter for my fuji camera. Does this mean if i use ...
- 11
1
vote
1
answer
65
views
Most influential scientific research on visual composition?
There are countless articles and videos on visual composition. They give you “rules” with little justification or rationale. They tell you the rules are meant to be broken.
I get that there is an ...
- 111
0
votes
1
answer
63
views
Equivalent lens to periscope camera?
I am trying to figure out an equivalent telephoto lens to the newer periscope cameras that report focal lengths in 35 mm equivalents. There are some similar threads such as How do I convert lens focal ...
8
votes
7
answers
2k
views
Features a camera should have for a 10 year old
I'm looking for a starter camera for a 10-year-old that is interested in photography as a future career. I don't think she knows what kind of pictures she wants to take. She watches a YouTube channel ...
- 181
0
votes
2
answers
52
views
Solutions for Snoot Modifier Overheating Tungsten Light?
I'd like to use a snoot light modifier on an halogen light, though it's clearly causing the bulb to overheat. This is to the point of seeing smoke coming out of the light's body.
I suspect the snoot ...
- 3
0
votes
0
answers
26
views
Can I export a puppet warp mesh of photoshop to a file?
I wish to export to a file the mesh/vertices/triangles of puppet warp in photoshop, and the warped vertices (the diff of each vertices maybe?).
Is that possible?
- 1
0
votes
1
answer
189
views
What is this mystery Vivitar lens mount?
I was given a box of old lenses by a friend, and came across only one that's different. It's a Vivitar 135mm f/2.8 auto lens. I'm not familiar with the lens mount. After comparing both Nikon ...
1
vote
1
answer
48
views
In Photoshop, can you isolate a particular color range and make it richer?
I have a photograph that has a very high color range, it was taken on a cheap camera. If I adjust it to make the blacks darker, and the whites less blown out, the intermediate colors (In this case, ...
- 119
0
votes
2
answers
145
views
Buzzing Noise and error 01 canon camera
Hi I have a canon rebel T3 have a canon 75-300 mm lens. When i lock the lens in and turn on it starts to make a buzzing noise and I get error 01 when I try to take a picture. I try to take pictures ...
1
vote
1
answer
142
views
Help! Sigma Lens won’t manually focus
I have a Canon EOS 60D and a Sigma DG 150-500mm zoom lens that I absolutely love using for bird pictures, I’ve had it for a few years now and have never had an issue with the manual focus. It’s just ...
- 11
0
votes
2
answers
142
views
Is there any photography website where I could find photos based on exposure time, focal length, ISO...?
I was wondering if there is a site where I could filter photos that were shot, for example, with a certain exposure time and few other conditions.
Is there any photography website where I could filter ...
- 105
2
votes
2
answers
82
views
How best to digitally copy glass negatives?
I recently bought my first (5x4) glass negative on an auction site. I assumed it would be trivial to scan the plate then invert the negative on gimp. Well, it is trivial, but I'm not getting results ...
- 23
9
votes
6
answers
4k
views
Red LED not red but white after I take the photo
Taking a photo of a small red LED causes the resultant photo to have the top of the LED to be white than red. I'm using a Canon S-120 I've tried many different setting with no luck. My friend who is ...
- 91
0
votes
3
answers
112
views
How to calculate the Aperture and Focal length needed for depth of field
I have a virtual camera in a game engine.
The camera has an DOF setting where you can set the :
Distance to object
Aperture
Focal length
I would like to set a depth of field (lets say about 5m) ...
- 11
0
votes
2
answers
161
views
How do I post a photo to instagram from the computer?
I took a photo with my Nikon, edited in Gimp but I can't upload the .jpg to instagram from the computer. I get an error "Something went wrong. Please try again.".
I read square photos should ...
- 3
0
votes
1
answer
74
views
Sony 50mm 1.2 GM lens has loose elements inside?
I just received my Sony 50mm f1.2 lens. When holding the lens by itself, if I turn it over front on top, then back on top, and repeat, there are elements inside that shift around. They feel heavy, so ...
- 111
0
votes
0
answers
13
views
is there a way to extract user supplied image descriptions (e.g., Quick Describe) from LR5 catalog (.lrcat)?
My images and the my Lightroom 5 catalog (.lrcat) are completely out of sync so I am trying to to recover the text that was written in the Quick Describe and Large Caption fields in the Lightroom ...
- 1
0
votes
1
answer
63
views
Camera light leak or processing issue?
After leaving it in the cupboard for a while, I just shot 2 rolls of B&W 120 film on my Holga and had them processed and scanned by a local lab.
I expected that I wouldn't get perfect images out ...
- 1,617
1
vote
2
answers
100
views
The meaning of Y in sRGB color space
In the definition of sRGB color space, https://en.wikipedia.org/wiki/SRGB
Is the Y relative luminance in the above table？ What does the value of Y equal to 1 for white point mean?
The chromaticity ...
- 235
0
votes
0
answers
34
views
Automatically find identical photos from two different libraries and replace the original metadata
Here is my problem, I mirrored my entire photo library over to a new system, and then I organised them there and renamed some of the photo file names too. I must have made a mistake somewhere along ...
- 1
0
votes
0
answers
110
views
Alternative to Peak Design Cuff (Camera Wrist Strap)
I wanted to buy Cuff from Peak Design, but I've just noticed a lot of comments about anodized aluminum adjuster, which can scratch a body or a mounted lens accidentally.
Is there anyone here who uses ...
2
votes
2
answers
1k
views
Why does the image get bluish and not yellowish when I shift the color temperature to a lower K? [duplicate]
I know that colour temperature is an approximation of the black body emission, so a body with a higher temperature emits bluish light while at a lower temperature emits yellowish light. However in ...
- 413
1
vote
1
answer
39
views
Is it possible to read one bayer raw data steam file using RawTherapee?
I have one bayer raw file which contains only pixel values in bayer pattern and no metadata.The bayer pattern is known.
Is it possible to the file using RawTherapee?
The following link provides some ...
- 235
0
votes
2
answers
81
views
What is the minimum signal level for digital sensor?
Say there's a camera sensor, in a given time, a pixel sensor (abstract a group of subpixels from Bayer filter into one indivisible pixel) can only be activated when more than 10 photons hit it, after ...
- 399
0
votes
1
answer
67
views
Are RCR123A batteries safe to use with an EOS 30?
I've bought some rechargeable batteries for my Canon EOS 30, but I've noticed that their voltage when fully charged is 4.2 V, rather than the 3.5-3.7 V of a regular CR123A battery. Does anyone know if ...
- 101
0
votes
1
answer
59
views
Weird blotches on old negatives and slides?
I am scanning some of my old negatives and slides. On some I have found a weird blotching, almost like a fungus that is growing on one side of the slide/negative (I've found the same on both media). ...
1
vote
0
answers
45
views
Phone Gimbal - complete rotation lock in space
I'm new to topic of gimbals. I'm trying to accomplish following scenario: I have a phone, and I want to keep its camera always facing ceiling (parallelly) and always in same rotation in respect to xy ...
1
vote
1
answer
64
views
Darktable: How do I adjust the exposure on one half of an image?
I have some film scans from a half-frame camera, so each scan contains two pictures (side-by-side).
Some of the scans are consistently overexposed, but by different amounts. For example:
I'd like to ...
- 111
0
votes
0
answers
122
views
Sigma lens with Sigma teleconverter or Canon teleconverter
I am in need of a longer focal length and I can't currently buy a +400mm lens so I have decided to purchase an extender/teleconverter for now. I have two lenses on which I will use the TC.
The first ...
- 269
0
votes
2
answers
44
views
What is the guide number of a smartphone "flash"?
I know that smartphones have a LED "flash" which is not really a real flash that would produce a very intense short-lived pulse of light, but rather is a continuous light that is turned on ...
- 6,034
0
votes
0
answers
54
views
Canon AE-1 Aperture Lever in camera sticking
The lens I have confirmed to work on my back other A-1 but for some reason this camera body isn’t allowing the aperture diaphragm to fully close. It’s working from f1.4 to f5.6 but anything more it ...
- 1
3
votes
2
answers
125
views
What happens if a DSLR loses power mid-exposure?
I recently purchased a dummy battery for my camera so I could take timelapses over a longer period of time than my battery would last. For now I'm using it in places where AC power is readily ...
- 344
0
votes
2
answers
48
views
Where to download D7000 Firmware version 1.04?
I am looking to downgrade my D7000. I am only able to find version 1.05, to my knowledge. It is somewhat confusing, but I don't believe I am able to find 1.04. Does anyone have a reputable and/or ...
0
votes
0
answers
95
views
What factors should be considered to compare two cameras?
Imagine that you are given two cameras and no information about them are given. However, you have all the technical tools in hand to compare their images and find whether their performances are the ...
- 101
0
votes
1
answer
64
views
Do power supplies exist for Godox speedlights?
I am using several Godox speedlights with my Nikon D500 for studio work. Is there a power supply that works with the flashes whether they are AA-powered or using a Godox VB18 li-ion battery?
1
vote
0
answers
26
views
Problem with Ilford Multigrade RC?
Is anyone else having a problem with new boxes of Ilford Muligrade RC? Even when exposing the paper to white light for an absurd amount of time, it is only going light gray in the developer. I am ...
- 11
2
votes
2
answers
120
views
Silent camera bean bag filling
Currently I have a camera bean bag filled with polystyrene and I find the sound quite loud and annoying, especially on a safari. I don’t believe that the sound is distracting any wildlife, but it is ...
0
votes
1
answer
45
views
How to record Adobe Photoshop Photomerge action?
I'm trying to record a Photomerge action in Adobe Photoshop, so that I can re-use this action for batch photo merging. However I'm only able to record the first step of the Photomerge, i.e: Layout and ...
- 111
0
votes
0
answers
87
views
Would spectral responses of camera pixels be more "raw", more compact and superior to ICC/DCP camera color profiles? If not, why not?
Background: I'm trying to understand the function of camera color profiles (for raw output) in terms of the hardware. I have found lots of web sites that explain the function of camera profiles from a ...
- 101
2
votes
4
answers
1k
views
Are most (if not all) lenses' focal length described as the 35mm equivalent? [duplicate]
2 thoughts made me ask this question:
Different lens looks different on the different-sized sensor and has a different 35mm equivalent
Many normal and wide-angle lenses' optical center is not ...
- 399
0
votes
3
answers
153
views
Which JPG settings are NOT applied to the back of camera screen of RAW?
I’d like to compare Canon t2i jpg to raw on the screen of the camera. It looks about the same. Is every setting applied the same way before it is displayed? Of course it is permanently applied to jpg,...
- 87
0
votes
3
answers
61
views
Can I use my Samsung A51 smartphone camera to look at the red/near-infrared region?
I have two regions of interest: red (~665nm) and near-infrared / far-red (~720-750nm).
(possibly more but I'd like to see what is possible first)
The ratio of the absorbance values for red/far red is ...
- 201
25
votes
4
answers
5k
views
What causes these squiggly lines in my photos and on my sensor?
(crop showing effected area)
Can anybody tell me what has happened to my sensor here? I can vaguely see this pattern on the sensor when I open the shutter and look at the sensor, but it doesn't look ...
- 251
0
votes
0
answers
125
views
What C adapter do I need for a 1x and 3x view microscope?
I am an archaeologist and my work supervisor just provided to me a binocular microscope with 1x and 3x magnifications along with a AmScope MD35 camera to take photos of the items that I am viewing ...
- 1
1
vote
1
answer
124
views
Can I turn on automatically selecting a shutter speed for Sony A350 with M42 lenses? Looking for adapter M42 ↔ Sony A
I have a couple of Sony bodies and e.g. in A6400 I can use M42 lenses with automatically selecting shutter speed because I can change options like Release w/o Lens and Shutter lock. Alas, I can't ...
-1
votes
2
answers
94
views
HDR wide dynamic range of a moving subject?
I see many questions without any innovative answers to this problem. It is difficult to manually edit out the ghosts in Photoshop. A single RAW image is wonderful, comparing dynamic range to a single ...
- 87
-1
votes
1
answer
121
views
“Binning” with old lens to INCREASE sharpness? [closed]
I have an old 900mm lens from the 70’s. There is often not enough light to achieve decent sharpness when you pixel peep, even under ideal conditions. It’s always a trade off between iso noise, low ...
- 87
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