CI of Blank Film

[sanking]

You guys probably aren't interested in hearing this, but Stephen Benskin has done some programming that does some really nice tone reproduction graphs - here's a sample of a 2 quadrant graph that he posted on photo.net last year.

http://www.photo.net/bboard/big-image?bboard_upload_id=17658784

He can plug in differing levels of flare, as well as different H&D curves for the film. When a 4 quatrand curve is made, you can see how the exposure at the lens is modified as it is recorded on the film, is then transferred to the paper, and then that is compared to the original scene. I find it really interesting.

The sample graphs you reference appear to be similar to the ones in Stephen Benskin's article on flare in the Jan/Feb issue of Photo Techniques. I read the article when it first came out but the subject was only of peripheral interest to me since it is focused primarily on the problem of flare with the Zone System, while I use primarily BTZS. However, the article appears to be conceptually sound, and is well researched and written.

The issue of flare itself, whether for Zone System of BTZS application, is an important one, so why not start a new thread on the subject if you like. I would suggest not continuing the discussion in this thread, if for no other reason the fact that the oxymoron "CI of Blank Film" is not an appropriate title for such discussion.

Sandy

 

[Kirk Keyes]

The sample graphs you reference appear to be similar to the ones in Stephen Benskin's article on flare in the Jan/Feb issue of Photo Techniques. I read the article when it first came out but the subject was only of peripheral interest to me since it is focused primarily on the problem of flare with the Zone System, while I use primarily BTZS. However, the article appear to be conceptually sound, and is well researched and written.

The issue of flare itself, whether for Zone System of BTZS application, is an important one, so why not start a new thread on the subject if you like. I would suggest not continuing the discussion in this thread, if for no other reason the fact that the oxymoron "CI with blank film" is not an appropriate title for such discussion.

Sandy

Sandy - Yes, the graphs are similar. I posted the link since some others brought up flare. But Stephen can make some really cool graphs that convey a lot of info that most of us are not used to seeing in a graphical form.

Actually, I really have no pressing conceptual questions or examples I wish to submit to the unhuddled masses on flare at this moment, so I guess I have to pass on your suggestion. But yes, the affects of flare on exposure is an interesting subject and one that is very often glossed over due to a lack of understanding of the principles behind it, and probably more importantly, lack of hard numbers with which to work. If there is some aspect about it you have been pondering, I would be interested hearing about it in a new thread as well.

Kirk

 

[Kirk Keyes]

... if for no other reason the fact that the oxymoron "CI with blank film" is not an appropriate title for such discussion.

Sandy

Please note that the thread was about "CI of Blank Film", not "CI with blank film".

AS I said before, you cannot derive CI with only blank film, but I was discussing an intrinsic property of a piece of developed film.

Kirk

 

[Claire Senft]

I will start the thread

Mr. King, I am also interested in this topic because it seems to me to be the least controllable aspect of the BTZS techniques...and other systems of exposure and development.

Damned good Idea Sandy.

 

[sanking]

Please note that the thread was about "CI of Blank Film", not "CI with blank film".


Kirk

OK, I edited the message to read "CI of Blank Film."