From: "doobisary" <tjp314@pacbell.net>

Date: September 11, 2010 6:14:26 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: New file uploaded to Astro_IIDC


Oops!  


I uploaded the wrong capture file!  This is the right one.  I also like your suggestion about adding an IR filter at the end of the adapter tube.  Will try that next time I image with the SCT.  Won't need it with the Newt, of course (unless the focuser is on the underside of the tube, and I never image that way).


-Tim.


=================== File:20100911_082554_U.mov #frames 2000

Color Camera - Model:'Flea2 FL2-08S2C' 

IIDC Format:7 Mode: 0 ClrCode: 10 MaxFps: 53.12 MaxPacketSize: 4080 

Camera Display Format: 1032 x 776 16 bit

CCD Image Left: 196

CCD Image Top: 148

CCD Image Width: 640

CCD Image: Height 480

Gamma: 1.00

Blue Gain: 656

Red Gain: 552

Brightness: 315

Black Point: 0

Exposure: 66.67 ms

Sharpness Limiting On: 0

Dark Frame Subtraction On: 0

Flat Frame Correction On: 0

Invert Image On: 0

Flip Horizontal On: 0

Flip Vertical On: 0

Histogram Expand On: 0

Binning Off Color



--- In Astro_IIDC@yahoogroups.com, Milton Aupperle <milton@...> wrote:


Hi Tim;


On 11-Sep-10, at 2:38 PM, doobisary wrote:


Here's the capture file for my latest Jupiter upload.


Your gain / Brightness are very high at 530. The gain maximum on the  

Flea 2 color I have here is 683, so your on the high end. That will  

amplify the noise levels dramatically especially if your not stacking  

a lot of frames.


Seeing was probably a 8-9/10.  Scope was well collimated.  But in  

the images containing a satellite, I could see little pollywog tails  

pointing north (up) that are probably thermal plumes.  Since they  

were still present after a couple of hours of equillibration time, I  

suspect that heat from the flea2 was flowing up the primary baffle  

and into the light path!


Possibly, but I'm not sure. I've never seen it on the C8 through in  

the winter time when i don't use the Cooler on the Grasshopper. And  

the Grasshopper adds + 10°C to the temperature as it's an EXHad CCD.


My hand in front of the C8 Corrector plate make amazing turbulence  

patterns when I'm collimation it (bob's Knob's) at -25°C in the winter.



Tonight, I'm going to try imaging with my "new" 10" f/6 Newt.  I  

built the entire OTA myself, around a mirror that I ground and  

figured at the Delmarva mirror making class this past March: http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/3739110/page/0/view/collapsed/sb/5/o/all/fpart/all/vc/1


You might want to try adding a U/V/IR or maybe a clear filter on the  

end of the 1.25" Bull nose to seal the camera off.


TTYL..


Milton Aupperle