ASTRO: Propeller nebula

here's a link

http://www.narrowbandimaging.com/dwb...alpha_page.htm

Richard,

great picture. I have done the preprocessing on my "propeller" images, but I
have more noise and the second half of the session had very blurry stars
becaus of focus drift (I didn't have the mirror lock properly engaged, I
always fear that I might damage something if I turn it too much).

Stefan

"Richard Crisp" schrieb im Newsbeitrag
m...
here's a link

http://www.narrowbandimaging.com/dwb...alpha_page.htm

Stefan Lilge wrote:
Richard,

great picture. I have done the preprocessing on my "propeller" images, but I
have more noise and the second half of the session had very blurry stars
becaus of focus drift (I didn't have the mirror lock properly engaged, I
always fear that I might damage something if I turn it too much).

Stefan

"Richard Crisp" schrieb im Newsbeitrag
m...

here's a link

http://www.narrowbandimaging.com/dwb...alpha_page.htm


I crank my mirror lock until it "ratchets". At least in the 14" version
you can't over tighten it. Since I only use the 3" Crayford focuser I
never release it. but twice a year. The Crayford's range is about 3 cm
and that's not enough for summer and winter so each spring and fall I
readjust the main focus then relock it.

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".