vignetting advice

[telecasterguru (Frank)]

To help avoid vignetting when imaging, am I better off keeping the images all the same duration?
Does this in fact have any impact on vignetting?
I am using a 1000D with an ED127 and a 2" connector.
What is the best process for the flattening of images to reduce vignetting?
Thanks

Frank

[scarper (Mart)]

From my experience the length of time the exposure is has no bearing on the vignetting......having 2 inch accessories, as apposes to 1 1/4, would I think make more of an impact.

[telecasterguru (Frank)]

I was told that using a 2" adaptor would mean less vignetting.

Frank

[RB (Andrew)]

Originally Posted by telecasterguru

To help avoid vignetting when imaging, am I better off keeping the images all the same duration?
Does this in fact have any impact on vignetting?
I am using a 1000D with an ED127 and a 2" connector.
What is the best process for the flattening of images to reduce vignetting?
Thanks

Frank

Frank, the duration of exposure doesn't affect vignetting, you'll need to start taking flats and get a field flattener for your scope (and of course stick to 2" adapters).

[telecasterguru (Frank)]

Andrew,

I bought a 6.3 reducer flattener but when I put it in the chain I can't reach focus. I got a smaller adaptor but this didn't get me there either. So I haven't been able to use it.

Frank