Re: [APML] New Image: M78 Mosaic

["Robert Gendler" <robgendler@worldnet.att.net>]

Roland,

Thanks. My routine with this camera is unguided 30 second

subexposures because I don't have a guiding system. The

adavntage is that the stars stay small and blooming is rare.

The downside is having to stack dozens (sometimes hundreds!)

of subframes. The readout noise for the IMG 1024 is low

and the QE's are very high so I'm not losing much with the short subexposures.

This image consisted of roughly 140 subframes. The exposures

for the main frame on the right (with M78 and NGC 2071)

were LRGB = 20:10:10:10 minutes and about half of that

for the frame on the left. The ST10 would offer much better resolution

but the FOV of the IMG camera is 4X that of the kodak3200 (ST10).

I have been using the IMG1024 for larger dim nebulas and the ST10

for high resolution imaging of smaller targets like galaxies and

small nebulas.

Rob Gendler
Email: robgendler@att.net
Web site: http://www.robgendlerastropics.com/

----- Original Message -----

From: Chris1011@aol.com

To: astro-photo@seds.org

Sent: Thursday, December 13, 2001 6:54 PM

Subject: Re: [APML] New Image: M78 Mosaic

In a message dated 12/13/2001 3:37:46 PM Pacific Standard Time, robgendler@worldnet.att.net writes:

This is a two frame mosaic taken with my RC at F7.5 and IMG 1024 camera.

Stunning!

How are you guiding this camera? Exposure time? Are the 24 micron pixels a good match to the F7.5 focal ratio, or are you interpolating the pixels?

Roland Christen