Quote:
Originally Posted by The_bluester
I have 36mm Astronomiks with my 2600MM and while there is vignetting visible in a stretched flat with my 10"F4, unstretched you would never see it and flats correct lights nicely. I have only ever run across a noticeable Oiii halo the once and that was on an extremely bright star. I can't comment about any cheaper or price comparable filters to the AStronomiks but the Chroma's and 'Dons would want to be pretty flash when you compare the money.
They are close enough to parfocal to live with the difference, at one point I had a clear and HA-Oiii with my 2600mC, focusing through the clear and they looked fine. There is a trend of focus difference visible between the filters but it was not much more than the variation you see focus run by focus run with the same filter. Focusing through the individual filters did produce measurably sharper results, subjectively there was not much in it.
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Paul,
Thanks for your input
Much appreciated
Looked at quite a few reviews and YouTube clips now with the Antlia filters , they all say Parfocal , which is great. Still favouring the 2” filters even though the 36mm would be ok I suppose
I originally looked at the Astronomik’s but the reviews for the Antlia are excellent and priced accordingly. Astrodons and now Chromas are ridiculously expensive.
Doing some forward planning too with my stacking software DSS, not bothered to use anything else , it just works. I have to work out how to stack and align the separate channels of both LRGB and NB when I capture data over multiple different nights and the camera is removed from the rig as I image from 2 different sites and rigs
I understand using a reference frame but I may have to use Groups like I do with my OSC data over multiple nights. I might post on the DSS forum and see if some folk have a few short cut methods which work.
Thanks again
Martin