I am going to go out on a limb here and say long exposure time.
fred
One use is as a reciprocity test. Shoot a target or scene at whatever f-stop you need for a shutter speed of 1/8th second (0.125 seconds decimal). Without changing the f-stop or lighting, add a 10 stop ND filter and make a 125 second exposure. Bracket f-stops holding time at 125 seconds and the image that matches your original is the number of stops you need to adjust for reciprocity failure at that time. From this you can figure a Schwarzschild number to give your characteristic reciprocity failure for that film.What would you use a 10 stop ND filter for?
Thanks for your help folks. Pity b+w don't make them in this size. Might have to change tack. Can anyone recommend a 6 stop+ slot filter then to fit my Lee filter holder. I want something as strong as possible as I don't want to stack filters.
For anyone interested in very strong ND's that will fit the Lee system, Formatt (makers of Hi-Tech filters) will make 10 stops+ to special order. See about half way down this thread:
http://www.fredmiranda.com/forum/topic/604648/2
Cheers,
Gavin
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?