Another Look at RH-200 Results

[dvj (John)]

I've added a considerable amount of data to the RH-200 view of the Horsehead. This is a 100% resolution crop from the STL1100, representing about 1/4 of of the entire field - I like this composition but also good to show full res capability of this little instrument at 9um pixels.

Data:
Officina Stellare RH200 f/3 Riccardi-Honders
STL11000
6nm Ha filter
35 x 600s total exposure time.
Non linear curves and levels only in PS - I only spent about 45 minutes working the data.
Star Spike sofware
San Jose, California

Comments:

This instrument can benefit from longer exposures in narrowband. 20 minutes in a rural location would be quite spectacular for signal gathering. This really needs more urban light pollution blocking. 3nm might be best here.

I am finding this instrument to be quite stable with temperature changes. Absolutly no focus shift.

No differential flexure in a test 40 minute sub from the city using the STI guider assembly.

Need smaller pixels!!!

http://img26.imageshack.us/img26/681...dnewcroppe.jpg

and here is a 50% resolution of the entire field. Curves adjusted a bit to show the extent of the nebulae

http://img812.imageshack.us/img812/8...dnew50perc.jpg

[swannies1983 (Dan)]

That's absolutely fantastic!

[gregbradley]

That's a great result. I am interested in one of these puppies. Not sure if 8 inch is enough though. Their 12 inch is hugely expensive.
I guess its faster than an FSQ and it appears to have tight stars unlike the Epsilon 180ED which seemed to not give as fine an image as FSQ.

I think a Microline 29050 with a MMOAG would be good. But if you are not getting flexure then just the ML29050. That is 29mp and around 5.5 micron pixels. QE is just under 60%.

I was tempted to get one last year but ran out of $. It would be a good match for fast refractors and scopes like this. 8300 chip has too small a FOV and also will do star bloats with that sort of speed unless you do shorter exposures in LRGB. The 29050 may also bloat as it also has small wells. Narrowband though should be no trouble.

Greg.

[dvj (John)]

Originally Posted by gregbradley

That's a great result. I am interested in one of these puppies. Not sure if 8 inch is enough though. Their 12 inch is hugely expensive.
I guess its faster than an FSQ and it appears to have tight stars unlike the Epsilon 180ED which seemed to not give as fine an image as FSQ.

I think a Microline 29050 with a MMOAG would be good. But if you are not getting flexure then just the ML29050. That is 29mp and around 5.5 micron pixels. QE is just under 60%.

I was tempted to get one last year but ran out of $. It would be a good match for fast refractors and scopes like this. 8300 chip has too small a FOV and also will do star bloats with that sort of speed unless you do shorter exposures in LRGB. The 29050 may also bloat as it also has small wells. Narrowband though should be no trouble.

Greg.

No need to get one if you have an FSQ already. My Proline 16803 and FSQ combination are hard to beat.

[Martin Pugh]

Now that's what RH200 data should look like!

Fabulous detail. I wish my AP RH300 will hurry up and get here.

cheers
Martin

[dvj (John)]

Originally Posted by Martin Pugh

Now that's what RH200 data should look like!

Fabulous detail. I wish my AP RH300 will hurry up and get here.

cheers
Martin

Me too Roland has to finish up the 175's first, which BTW I passed on for the 305. I think the 305 from AP will be a very unique instrument to own.

[gregbradley]

Originally Posted by dvj

Me too Roland has to finish up the 175's first, which BTW I passed on for the 305. I think the 305 from AP will be a very unique instrument to own.

I agree with that. The AP175 whilst no doubt a spectacular scope may not be that different to the TEC180FL which is more accessible.

Greg.

[Ross G]

What an amzing photo John!

Great detail.

Ross.