Hello! I'm trying to improve my flats. I use a Meade 8 in LX200 classic and an SBIG ST-402ME with BVIC filters. I made a light box as described in AIP4Win with four bright white LEDs.
Integration times to range for V=7.3 sec, B=20sec, and I=100sec.
I experimeted with using a string of 6 small incandescent bulbs without the white LEDs. The bulbs have an orange hue. The integration times are V = 6sec, B=60sec and I=0.6sec. I used a dimmer switch and the I was obtained on the lowest setting and the V and B on the brightest setting.
I'll try to mix and match the bulbs with the LEDs to get a more balanced integration times, and see about replacing several of the orangish bulbs with white incandescent bulbs.
I've read about trying to get exposures between 2 sec and 10 sec, presumably to balance noise and shutter effect. Is there a shutter effect when taking flats with the ST-402 using short exposures that would create artificial light gradients in the flat? Thank you and best regards.