Image of the day

Captured by
Mark Killion

The Iris Nebula

My Account

New to Astromart?

Register an account...

Need Help?

Posts Made By: Frank Gelsdorf

July 17, 2008 05:21 AM Forum: CCD Imaging and Processing/Solar System

Jupiter Attempt

Posted By Frank Gelsdorf

Pretty nice restart.

Regards smile


July 27, 2008 08:15 AM Forum: Equipment Talk

Collimating my SCT

Posted By Frank Gelsdorf


you can find a lot of info about collimating an SCT on the web by just 'googeling' those terms. My personal bottom line is:
- Lasers are not of much help (tried them myself; from you post I assume that your miscollimation is not obvious in the alignment of the shadow of the secondary)
- The Allen screws the scope comes with do the job. My SCTs hold collimation quite well.
- Looking at the diffraction pattern w/o diagonal (just an eyepiece straight through) the mental image I use to 'find the right screw to turn' is shown in the picture.

Hope this helps


August 1, 2008 06:19 AM Forum: CCD Imaging and Processing/Solar System

3D (Jupiter, Io) transit

Posted By Frank Gelsdorf


very nice 3D effect. Thanks


May 10, 2009 04:20 AM Forum: CCD Imaging and Processing/Solar System

Europa occulting Ganymede, 8th May

Posted By Frank Gelsdorf

Great work! This is the first time I have seen this done. I am amazed about how far planetary imaging has come.