More fun with OAG - Two from last night

[dcalleja]

Hi
Round two and still getting the hang of OAG on the STF8300.
Much better on Omega and the Jewel box. I got both 5 and 10 min subs (mostly) without eggy stars.

Comments and critique most welcome

Thanks
Dan

[multiweb (Marc)]

Great star shapes. Working well.

[Larryp (Laurie)]

Nice results, Dan. Years ago when I had a 10" Meade s/c, I used to use an OAG-only way to go with a Schmidt/Cass

[gregbradley]

Round stars - woohoo! Its the first milestone and a difficult one to achieve on a regular basis.

Greg.

[dcalleja]

Thanks guys - yes I was more than a little surprised.
Had a few issues with the STi (getting it to focus and finding guide stars) .

I got the colour STi (thinking i would do some planetary work too) and am beginning to wonder if i shouldnt have gotten the mono version for more sensitivity. But it does seem to work quite well once you find the right spot and dont oversaturate the guide star

[Ross G]

Nice looking photos Dan.

I really like your Omega Cent.

Ross.

[Merlin66 (Ken)]

Dan,
I use the beamsplitter as a "full field" OAG on the C11 @ f10.
Using the Lodestar, finding and guiding becomes boring ;-)
(10min subs on the spectroscope 25 micron slit - what more could you ask for??)
The more you use the OAG, the more comfortable you'll become.

[dcalleja]

Thanks Merlin
Im intrugued by the beamsplitter reference?

Originally Posted by Merlin66

Dan,
I use the beamsplitter as a "full field" OAG on the C11 @ f10.
Using the Lodestar, finding and guiding becomes boring ;-)
(10min subs on the spectroscope 25 micron slit - what more could you ask for??)
The more you use the OAG, the more comfortable you'll become.

Thanks Ross

Originally Posted by Ross G

Nice looking photos Dan.


I really like your Omega Cent.

Ross.

[Merlin66 (Ken)]

Dan,
For spectroscopy I use an "on-axis' guider...it's a beamsplitter plate at 45 degrees which sends 4% of the incoming light to the guide camera and 92% of the light goes through to the slit on the spectroscope.
This arrangement lets me aquire and guide on a target star and accurately position it (using Al's Reticule) onto a 25 micron entrance slit.
Works 110% for spectroscopy.
Hope this helps.