From: "milton_aupperle" <maupperl@shaw.ca>

Date: November 2, 2012 2:19:03 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: ONAG Review

Hi Folks;

If you don't have a subscription - pick up the December 2012 issue of Sky And Telescope at your local news stand.

There is a really neat review on "Innovations Foresight's " ONAG (On Axis Auto Guider" product on page 60. Not cheap at ~ $1000, but interesting.

I'd never heard of it before, but it's basically a  "cold mirror" that reflects 350 to 750 nm light and passes all light above 750 nm to the guide camera.  So you can guide on the same  or very close to the same object your imaging with a single scope.

My Grasshopper EXHAD camera with Sony ICX285AL CCS would have about 50% sensitivity at 750nm and drops to about 5% at 1000 nm.

I also wonder if one could use that with an Adaptive Optics units,  for DSO / Photometry but also for imaging planetary targets to remove turbulence.

TTYL..

Milton Aupperle