T997

johnrt & kirkster501 - I see that you're both using the Atik 460. Aside from the 2" IDAS filter, are your other filters 1.25"? Do you find any issues with vignetting on the CCD image using the 1.25" filters? I have a similar setup, but I use a DSLR at the moment; I'm seriously considering upgrading to the Atik. With the DSLR, all filters are 2" to avoid vignetting, but it is my understanding this is less of an issue with the smaller chips of CCDs such as the 460. Thanks, joe

ok, thanks for clarifying

very interesting thread. John - I see on your website that you're currently using an IDAS LP2 filter. Have you placed this in your filter wheel? (or is it placed ahead of the filter wheel and therefore used in all images?) Thanks, joe