PLEASE ADJUST MONITOR BRIGTHNESS AND CONTRAST TO FULLY APPRECIATE THESE IMAGES
This is a demonstration of what push processing will do to Kodak E200 film, this slide film is nominally 200ASA speed, but it does respond to push processing (specified at time of development) very well, I believe a 1 stop push results in 320ASA, and 3 stop push results in 1000ASA. These are daylight ASA ratings and probably are not applicable to astrophotograpy. Both images were taken with a 60mm f4.5 telephoto lens, 15 minute exposures on a fairly good nigth. Visually inspecting the slides one looks darker than the other, the 3 stop push slide has a sligth green cast...probably beguinning to overexpose at 15 minutes. Both images were levels adjusted in Photoshop to have the same dark background level (note the blurred circle above the 3 stars in the closeups, this is where the measurement was taken), note that I include a portion of unexposed frame so that you can take your own measurements on the base unexposed film.
Conclusion: there is a slight increase in true recording power with +3 stop push, and a sligth grain increase at my scan resolution of 2700dpi, note that the details images have not been resized, they are displayed at full 2700dpi resolution. If you are interested I can email high quality JPG versions of these images. Yes, these images are not focused properly.
This is the +1 stop push version, full frame. Note pleasing "true" color look.
This is the +3 stop push version, full frame. Note the more "redish" look, but increased red nebulosity.
This a full resolution close up of the +1stop image, you can see a smooth circle on the right hand side of the image, this was used to match the two images:
This is a full resolution closeup of the +3stop image, note the increased grain:
