0.00
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| Imaged over three nights poor weather but managed to capture 4 x 900 un binned and RGB of 6 x 300 each binned 2 x 2 |
9.03
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| Hang in there. These objects require persistence.... |
1.91
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At a f5 usually i need more that 30 hours, i started with less time... but the results are really better, time, sharpless objects need to much time..  |
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9.03
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Yes, I just changed scopes. I had a Takahashi 180ED which was F2.8! This is a Newtonian with a built in focal reducer... but very hard to collumate. CFZ = 17nm. I got it because I knew in my LP I was going to do NB. It worked well for years but at 500mm FL everything was wide angle. It was 12 years old when I sold it. Mirror needed to be replated. A friend recommended Stellarvue... was considering a Tak 106, but they have had quality control problems. Stellarvue is local to me so I went out there and was impressed. I knew I could convince them to give me a very good piece of glass... or I could show up; on his doorstep. ;) Anyway, this is F7 and FL 912mm. Works well enough on length of exposures. Though I always have some guiding issues. I also bought their FRer which will reduce the FL to about 700 and the F to 5.6. I like longer FL so have not tried it. I normally start with 8h of HA... to improve the SNR you really have to go to 16h+ as you can see. The O-III is even worse. My buddy here says you need 2 O-III for every HA and he is right. Also nosier. I am trying to deal with the noise in post-processing. Right now I am trying to hit all the Sh2 objects I have missed so more into quantity than quality.... a lot are pretty bright but the obscure #s are small. Clear Skys! |
