flats

[spike77]

should flats b taken at the same iso speed of the light frames and does anyone no a good rule of thumb on how many to use for the best results

[spike77]

i wonder if u put to many would u start wipeing away data hum ?

[Charles Dunlop]

I do thirty per color channe,

[spike77]

wow mark thanks for the info man wasent exspecting that much info and u nailed it thanks buddy i was doing my flats at the lowest iso speed of the camera and was haveing to use a whole bunch of them to get the big white blob off the image gonna reshoot them and apply new flats and c what we can come up with

[Marc Basti]

Technically, they don't have to be, but DSS as a stacking program wants them that way. I usually shoot 20-25 frames. There is a good "How To" in DSS under FAQ. I put a link to it in the Tutorials discussions group. That's funny Spike, if it's clear tomorrow I need to shoot a new run of flats for the field flattener I got. One of these days I'd like to get one of those light foils, errrr more money please. Marc