STF mode on Dynax 7

Hi folks,

I would be interested if anyone knows how the "STF mode" on Dynax 7 (film SLR) works (what is the principle) as the Dynax 7 instruction manual on the page 180 only mentions that the mode triggers "a continuous multiple exposure". What confuses me as well is a note, that it can`t be used in situations "the subject is bright" as "the aperture`s background will appear white". Do not undestand that at all.

Do you think it`s possible to simulate this effect with a digital SLR by multiple exposures (taken separately) and subsequent blending them together e.g. in Photoshop ?

I know I can achieve this effect with the STF lens but I don`t own it at the moment (and won`t own it in near future either).

Thanks in advance for any ideas and replies.

Regards

Daniel

As wedlpine says, seven consecutive shots taken with reducing aperture and they all seem to have the same exposure time from what I could see of a sample someone posted with a moving target.

I've tried to get the same effect with the A100 and manually taking a number of shots; it should definitely be possible but I had problems getting the colours to come out correctly. I think when I added the multiple frames together I wasn't taking gamma into account, which resulted in some nasty hue shifts.

I'll definitely have another go at it later, probably by processing my ARW files with gamma=1, underexposed by 1 stop, summing frames in 16-bit then applying gamma last. If/when I get a successful result (could be a while! as I have many other things to do) I will definitely be posting it to dyxum.

Edited by polyglot - 24 October 2007 at 05:42

Thank you all for your ideas

to polyglot: looking forward to seeing your results