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Unanswered Questions

8
votes
4answers
515 views

Why do my Cybersyncs fire my Sunpak flashes with the test button, but not the shutter release?

During wedding receptions, my Sunpak 383s fire very inconsistently. Every time I press the test button with the Cybersyncs, they fire every time. When I press the shutter button, they don't fire. ...
7
votes
3answers
2k views

Any known issues when using Google Drive with Lightroom 5 (Catalog & photos) on two computer?

Does any of you have experience in using Google Drive with Lightroom 5? Like to use GDrive to be able to show/edit my photos on my Macbook and iMac. I know that I am only able to open Lightroom ...
6
votes
1answer
167 views

Does it matter what edge finding algorithm you use?

I was playing around with an action set that I have that creates edge masks using the Roberts, Robinson, Sobel, Prewitt, and Kirsh algorithms. Because of the differing levels of brightness, I decided ...
5
votes
0answers
180 views

At which lux level do the Nikon 1 cameras switch from PDAF to contrast-detection?

The Nikon 1 cameras are famous for being able to track focus with their on sensor PDAF. But the story goes that if light is low, it will switch to contrast-detect only and will not track focus as ...
4
votes
1answer
70 views

How to estimate the minimum magnification to capture features of a certain size?

What is the correct way to estimate the minimum magnification (maximum subject distance) at which features of a certain size are resolved? My thinking is that given a system capable of resolving a ...
4
votes
1answer
71 views

how to clean an old metal newspaper photo engraved plate?

I have an old metal engraved plate of a picture of my family that was used by the newspaper back in the 1950's. Unfortunately, it has a lot of white type spots of some kind of powder/crystal growth ...
4
votes
0answers
135 views

Does Lightroom take sensor size into account when applying lens correction profiles?

I have a question about using the lightroom lens correction profiles for cameras other than full frame. I have been using a Tamron 24-70 which is known for having slight vignetting (full frame only) ...
4
votes
3answers
147 views

How do I rig up a color filter for my Sigma 8-16mm Ultrawide?

I am a bit confused... I'm not sure if the cokin system will work on my lens, as my lens doesn't have threads for a filter. I've found that placing a Z series cokin filter in front of the lens will ...
3
votes
0answers
45 views

Is there a standard vocabulary for posing?

I've been looking for a definitive catalog of named poses. Catalogs consisting mainly of unlabeled photos are easy to come by. "1,001 Poses for the Professional Photographer," kind of thing. This ...
3
votes
1answer
54 views

Calculate angle/field of view from 2D image

I want to calculate the angle of view (or field of view) from a photograph, without knowing anything about the camera (or lens). Please have a look at this example. It is assumed the angle between ...
3
votes
0answers
71 views

Horizontal artifacts in Lightroom after import

I have some old photos on the SD card in my Sony A57. After importing into Lightroom, there are horizontal artifacts on most of the imported photos. This is a screen grab of Lightroom displaying one ...
3
votes
1answer
38 views

Why do some photos show entirely black when exporting a 1080p slideshow from iPhoto?

I used to make slideshows with iPhoto and export as video. Today I'm trying to make another one but some photos appear totally black when exporting in 1080p... I tried to export at lower resolutions, ...
3
votes
0answers
70 views

Diagnose a damaged lens from focus test results

I have a lens that gives perfectly decent results at f/22 and f/32. Here's its capture of an ISO 12233 test chart: It's not the sharpest lens I own, but whaddaya want, it's a quarter century old ...
3
votes
2answers
125 views

How can I use a reflector for wider group shots?

I am a budding photographer and have taken some good one-person and couple photos but I am needing help using a reflector. I am shooting a family of 3 in a week. It will be outdoors but mostly in ...
3
votes
1answer
93 views

How to open a raw file in camera raw in the correct image aspect

On a recent photography holiday I took a number of photographs using the in camera option to change the image size to, for example, 16 x 9. The native image size of the camera is 4:3. I transferred ...

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