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This is a photograph and its setup...
This is what I do when I want a quick diffuser for a pop-up flash. I use a 4ply piece of 100% cotton rag mat board cut to size and put it in the spot the flash itself collapses into when not in use, fits perfectly and stays there snugly.
This is a series of test exposures made on a Nikon D50 with a Sigma f/1.8 lens. Every file was shot as a Nikon RAW file and edited in Adobe Camera Raw.
The tests were done to learn just how far editing a RAW file can go in terms of digging up exposure information from the sensor. And hopefully allowing photography in low light.
The camera itself lets me choose between ISO 200, 400, 800 and 1600. Nothing in between..
Adobe Camera Raw has an 'exposure' slider, which is calibrated in 1 stop increments.. it goes up to +4 stops. With this in mind and a handheld ambient light meter in hand I decided to check how well this exposure slider worked.
I metered at and shot at ISO 25,000 and fiddled with the exposure slider and got an actual photo.. Tested in daytime bright light to dark with barely any light.
These photos were done in a 14x17x7 foot room with one household 75watt incandescent bulb in a desklamp shining off a white ceiling.
The Cyanotype process has been around since at least 1842. The invention of the process is credited to Sir John Herschel. The images it creates are based on ferric salts that create the distinctive prussian blue tone.
There are numerous websites and books that outline various recipes or how-to’s on creating Cyanotypes. This how-to is mine!
The Cyanotype I make is made with a two part chemical solution mixed in equal proportions. I purchased a kit from Bostick & Sullivan which included premixed dry chemistry in bottles that I only needed to add distilled water to make into a usable solution. Very easy!
I ordered the A and B cyanotype kit, 3 glass amber bottles with droppers, 3 extra droppers incase I need to replace them and 25 sheets of 11.5x14.5 paper. This is enough emulsion for roughly 250 4x5 contact prints and enough paper for 100 prints.. It cost me about $60 USD, very cheap if you ask me!
The formulation of parts A and B contain the following..
Shown here is a image from my home made 4"x10" pinhole camera, the print is made by contact printing.