Flats with a DSLR

[Aza]

Hi

I am still a bit unsure with flats on my 400D.

I capture with Nebulosity and the only settings I can change are exposure time and ISO.

What are ball park figures I should be using?

Thanks

[Tim]

I found this info on another site, which I cant seem to find now, however, it went like this.

AV mode - let the camera do the exposure regulating, just make sure all the filters etc you use are in place.

I tried using every Iso setting just to be safe, but tbh, the end results were similar in all cases, so I now combine them all into one master flat.

Hope that helps a little! I posted in the astro lounge about How flat is flat? and I THINK the reply came in that thread.

Cheers

TJ

[Aza]

Thanks TJ, I guess for these I should just save direct to the memoery card and not use Nebulosity to capture them.

Nebulosity has a setting for exposure time which seems to override what the AV mode wants to do.

Cheers

[George]

You will find lots of info here http://tinyurl.com/ytcec6

I did my flats etc using Jim's advice plus sone advice I found on this board.

[Psychobilly]

Hi George,

Thanks for the link very intersting reading indeed...

Anyone on here use the dithering technique sound like somethign extra to try?

Billy...

[glennbech]

I would consider "dithering" to be "hard core" :-) It puts you in the chair in front of the computer during the entire light capturing session. But then again; maybe that isn't such a bad idea at all. After spending 1 hour ++ setting it all up, it's a bit bitter to lose most light frames to a lost guide star while playing XBOX (like a "friend of mine" did) ...

[Psychobilly]

Or a bed alongside the pier in the Obs

Ok... so it's a comfy matress and a sleeping bag on the obs floor at the moment because I haven't built the Curved bed...yet...

but at least allows for the odd "micro-nap"

Billy...