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What to use when signing print on metal

I saw an old thread about using a BIC Mark-It to sign print on metal. Then I saw a set of BIC Mark-ITs on amazon but when it was delivered, the label said BIC intensity. Does anyone know if BIC Mark-...
canonguy's user avatar
0 votes
1 answer
108 views

Wrapping my head around the signal to noise ratio

To my knowledge the signal to noise ratio when talking about shot noise, is defined as the mean signal divided by the standard deviation. In the Poisson distribution, which can be used to model shot ...
vannira's user avatar
  • 197
4 votes
1 answer
1k views

Who said "when I am changing film rolls there is no photograph"?

I might have gotten the quote wrong, because I cannot find it anywhere online, but it is something along the lines... The context is that a famous photographer was asked how he felt about the photos ...
fortran's user avatar
  • 1,735
1 vote
0 answers
92 views

I also have a camera tripod that I am intrigued with. I can not find anything on line about it or the brand. I need some help plz. I have some picture [closed]

Can anyone help me identify this tripod. I believe it was used for photography of still images and people at a photography shop. Also does it hold any value?
Robb Kidd's user avatar
1 vote
0 answers
39 views

Can I Automatically append/suffix an image file name with the contents of the 'Tag' meta data?

I hope you can help. I am a complete amateur and don't understand anything about scripts and what not. I have all my photos tagged - places, people etc. using the 'Tags' metadata field. I would like ...
Ray's user avatar
  • 11
0 votes
3 answers
160 views

Canon EF 40mm f2.8 consistently sharp across the frame?

Does the EF 40mm f/2.8 lens give sharpness not just at the center but also to the periphery most of the time..? In comparison with the 50mm f/1.8 STM which only very sharp at the center..? I have done ...
Redsbefall's user avatar
0 votes
1 answer
228 views

GoPro footage from App to Computer?

I have a GoPro Hero 11, and have saved lots of photos and videos to the Cloud, and the Quik App on my phone. How can I get the photos/videos from the Quik App to my computer? The videos are stored in ...
BruceWayne's user avatar
0 votes
2 answers
90 views

Lightroom Classic synchronize folder fails to import metadata

I have Lightroom Classic 12.4 on my laptop and desktop, and store all my photos on my Synology NAS. I edit my photos locally on my laptop using Lightroom Classic, then (when I'm home) I use Lightroom ...
thatguy's user avatar
1 vote
1 answer
102 views

Does my new Helios 44m have fungus?

I just bought a new Zenit 122 camera with helios 44m-6 lens. The lens has something inside and I'm afraid if it's fungus and could infect my other lenses
user2085899's user avatar
3 votes
2 answers
80 views

How can I properly store multiple prints up to 60x90 cm at home?

Over time I have various prints from my photos, from 30x40 cm up to 60x90 cm. Mostly chemical prints from online good quality photo labs, but some are fine art prints, so inkjet (I think). They always ...
FarO's user avatar
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-1 votes
1 answer
222 views

Is it possible to find year of manufacturing for Canon 77D camera from its serial number?

Planning to buy a Canon 77D from mpb.de website. I know the serial number of camera. Can I approximately find the year of manufacturing from the serial number?
programmer_04_03's user avatar
0 votes
2 answers
62 views

Relation between half angle of numerical aperture and angle of view

The numerical aperture is defined as NA = n sin(θ) Where θ is the half-angle. For a lens consisting of multiple elements, is there any relationship between θ and the angle of view of the lens? Can ...
Amarth Gûl's user avatar
0 votes
1 answer
45 views

DOF formula vs the simplified DOF formula

I was calculating the theoretical difference in the change of the DOF (depth of field), between a frame achieved on a 25mm signature prime and an "identical frame" achieved by using a 75mm ...
vannira's user avatar
  • 197
1 vote
2 answers
69 views

How to check for excessive light from faculae on the dwarf planet Ceres?

The Dawn space probe took a lot of photos of the dwarf planet Ceres in the asteroid belt, and discovered the strange looking faculae (white spots) in the Occator crater that seem to glow in the photos,...
Sven _Andersson's user avatar
0 votes
2 answers
86 views

How can I digitize very dark film?

A while ago I had the chance to try out analog photography. Due to unknown reasons in development (likely a problem with one of the liquids) the resulting film negatives are very dark. That is, if I ...
jng224's user avatar
  • 1,608
11 votes
3 answers
2k views

70cm perfect focus depth of field for product photography

Please look at this photo below, on the left is the full product, and on the right is the 100% crop of the same photo. The guitar is around 100cm tall. If you incline by around 45°, you have about ...
Mario's user avatar
  • 313
0 votes
2 answers
59 views

Feasibility of simulating an Imagon lens with depth maps?

The Imagon lens gets its soft focus by being uncorrected for spherical aberration, so the light rays from the outer part of the lens focus at a different spot then those from the center. The degree of ...
Lynn Grant's user avatar
0 votes
1 answer
70 views

Pentax ME every other roll is blank, is this one too?

Every other roll I’ve used on my Pentax ME this year has come out blank. Current situation is I got to 36 but no resistance to signify roll is finished. Instead, I am able to keep taking pictures and ...
Chris's user avatar
  • 1
0 votes
0 answers
103 views

Testing out an old camera - why have the scans come out like this?

Found an old Goldeck medium format camera which I tested with a couple of rolls of film. Nearly all of the scans have come out this way even using different focus lengths. The last shot of the second ...
guestm's user avatar
  • 1
10 votes
2 answers
3k views

How can I take good photos of stars out of a cockpit window using the Samsung 21 ultra?

I am an airline pilot and as the winter is coming and we get nice clear nights I am seeing masses of stars out the flight deck windows. At night we have dim lighting in the flight deck and when I try ...
pilotman's user avatar
  • 201
0 votes
2 answers
76 views

Battery care and time resets?

In the past, I used to always leave one battery in my cameras. I have a set of photography and videos cameras including some Canon, Panasonic and Sony. I currently use them every few weeks, sometimes ...
TTT's user avatar
  • 253
-4 votes
1 answer
124 views

What is a .webp file?

I am accustomed to using old file formats. For example, .JPEG .BMP .GIF Beginning in the ...
Toothpick Anemone's user avatar
1 vote
2 answers
154 views

Grey circles in the background in photos

All my photos contain grey circles which is especially noticable on light background (e.g. sky). I don't know what is the name of this specific artefact and what is connected to (lens? camera?). So ...
Inna's user avatar
  • 13
1 vote
3 answers
122 views

Megapixels vs Compression Artefacts

Assume everything is equal such as lens quality, sensor etc, except the megapixels. Does cameras with more megapixels produce pictures with less compression artefacts than cameras with less megapixels?...
Redsbefall's user avatar
1 vote
1 answer
98 views

All my photos taken on canon powershot sd300 are overexposed

I got this camera recently and it’s been working fine in dark setting with flash but whenever i turn off flash or go anywhere with any sort of natural light the pictures come out almost white. I’ve ...
RWann's user avatar
  • 11
0 votes
0 answers
35 views

D5600 number of focus points does not display

Camera in AF-A and number of focus points set to 9-39. The view finder only shows a single point, centered, which can be moved manually, pressing shutter to focus never shows the 9-39 points available ...
Jeffrey Ross's user avatar
0 votes
1 answer
101 views

Does my camera still work?

I’ve left my camera untouched for years. as soon as i found it i order the charger online. i am currently charging it but it is not turning on. does it still work? ( it is an older kodak — easyshare ...
user112858's user avatar
1 vote
0 answers
97 views

How to set proper exposure in Darktable with scene-referred workflow?

I don't understand how to set proper exposure in Darktable. A few aspects of Darktable are opaque to me and contributing to my confusion. Such as, what the histogram actually shows when the Exposure, ...
Anopt's user avatar
  • 11
0 votes
0 answers
85 views

Is this effect because of the lenses? what type?

https://www.instagram.com/p/CwsKDthOdST So in this video, the legs of the man look really small. I thought at first it must be because of the lenses but if it were for wide angle lenses, that would ...
jazmin garcia's user avatar
0 votes
1 answer
66 views

Canon SL3 and Godox V1

I have searched to find an answer for one of my students and need help. Will the Godox V1 and Godox trigger work with the Canon SL3. Nikon is
Jud Davis's user avatar
3 votes
4 answers
1k views

Airy disks and pixel pitch on circle of confusions?

I read in this paper by Toshiba, which is in regards to optics in machine vision, that In machine vision, which processes each pixel of an image sensor at high brightness levels, the permissible ...
vannira's user avatar
  • 197
1 vote
3 answers
356 views

My new manual focus lens has stiff focus ring. Over-lubricated?

I recently bought a Jupiter 37am lens, which is a 135mm f/3.5 retro telephoto lens. The lens looks good and the glass is clean, but I have an issues with it. The focus ring is very stiff and hard to ...
user2085899's user avatar
2 votes
2 answers
714 views

Is this diagram I've drawn in regards to Depth of field correct?

This diagram is modelled after a video I saw on depth of field formula and its derivation. I have now learnt a bit more regarding Depth of focus and how it refers to "the tolerance of placement ...
vannira's user avatar
  • 197
0 votes
2 answers
124 views

Why is depth of field not always symmetrical about the object, yet depth of focus is practically symmetrical?

I have found an explanation on this, however I cannot seem to picture what the explanation is saying. From a Toshiba technical article: Remember that the previous subsection mentioned that the depth ...
vannira's user avatar
  • 197
0 votes
1 answer
69 views

Nikon D810 FX- Aperture Question

Can you change the aperture on the camera without the lens or does the lens on the camera have to be connected to the camera?
Rico's user avatar
  • 1
3 votes
4 answers
2k views

If focal length does not affect DOF, why doesn't a 25mm lens at an f-stop of 4 give me the same DOF as a 100mm on an f-stop of 16?

After having spent some time reading about DOF and the derivation of its formula, I tried calculating the theoretical DOF of different lenses. Now to my knowledge, a camera using a lens with a focal ...
vannira's user avatar
  • 197
1 vote
2 answers
112 views

Why do Adobe Bridge and XnView MP show incorrect thumbnails for cropped scanned images?

When I scanned in some 4"x6" photographs, my scanner produced jpg image files for the full 8.5"x11" bed of the scanner. I used XnView MP to crop the images, but now both XnView MP ...
KnowItAllWannabe's user avatar
2 votes
1 answer
47 views

Print development temperature?

What is the best way to regulate the temperature of developer and fixer whilst tray developing prints?
Solomon's user avatar
  • 21
4 votes
2 answers
165 views

Is it possible to get double or multiple exposures on a used SD card?

I’m getting “ghost deer” on my trail cam. They only show up on the night pictures (black and white) and hit the paint palette which turns them into color. Is it possible that a previous image of deer ...
Lee Hicks's user avatar
1 vote
2 answers
616 views

Backup compression that takes into account similarities between images? [closed]

I'm trying to reduce the total size of my backups without sacrificing quality, and more importantly, without discarding photos1. There are plenty of image formats that offer great compression, or ...
BoppreH's user avatar
  • 113
0 votes
1 answer
123 views

Can I continue shooting APS film if I think the roll isn't fully exposed?

My new APS film says it is fully exposed after taking just one photo. Can I continue shooting with it?
Rod's user avatar
  • 1
1 vote
1 answer
120 views

digiKam cannot find photos after upgrading to a larger hard drive [Linux] [Ubuntu 22.04]

I'm using digiKam 7.5 on an Ubuntu 22.04 system. After upgrading my laptop's SSD to a larger one (to make more room for more photos of course :) ) by backing up my home directory and then restoring it ...
NeilenMarais's user avatar
1 vote
1 answer
159 views

How can i produce sharper photos? [duplicate]

I am a relatively new photographer and I just purchased a Canon R7 and the Tamron SP 35mm f/1.4 DI USD lens. 1. I have read that the lens I am using is super sharp and have seen photos of it that look ...
Robin's user avatar
  • 13
3 votes
1 answer
160 views

Does the Nikon Coolpix 900 need the exact CF card specified in the package?

I was given a Nikon Coolpix 900 (1998 model) but there was no CompactFlash memory card. Basically in so many words the original package came with a: EC-8CF 8MB CompactFlash card but now I am ...
PrisS's user avatar
  • 31
0 votes
0 answers
61 views

Cannot Select This File error on Nikon D500

I have a Nikon D500 with updated firmware to the latest version. I purchased a CFexpress card type B and formatted the card. I’m able to download my images to my Mac using a card reader. But when I ...
Mlou's user avatar
  • 1
12 votes
10 answers
5k views

Can you "open" RAW camera files? [closed]

I was having a conversation with my father who used to be a photographer, and I said “when I open a raw file…” He interrupted me and said, "you can never open a raw file, the editing software ...
Daniel K's user avatar
  • 129
0 votes
2 answers
127 views

why is there black spots flashing on my pictures on lumix dmc tz80?

i bought a second hand lumix DMC TZ80, and there’s like black flashing things popping up on my pictures i took on it, like the picture i put here, the black things appear in the spots where it’s very ...
Evelyn's user avatar
  • 1
2 votes
1 answer
302 views

When shooting raw stills, does the tone mode setting matter?

I'm going through some of the settings on a Nikon Z8, and one of the options when shooting raw is to switch the tone mode from SDR to HLG. In principle, I understand what these two modes do: HLG ...
Jules's user avatar
  • 658
0 votes
2 answers
440 views

How can I determine if this image has been altered in any way?

I need help trying to see if this photo has been messed with in any kind of way. ...
court b's user avatar
0 votes
2 answers
215 views

Is the Canon EOS 30 considered a good camera in 2023?

I'm planning to buy a new SLR camera for my next trip and I saw some pictures taken with a Canon EOS 30 that I really liked but they were all taken with a Canon EF USM lens. Do you think the camera ...
juliana's user avatar
  • 21

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