Image of the day

Captured by
Bruce Karbal

Bat and Squid

My Account

New to Astromart?

Register an account...

Need Help?

EASIER DAYTIME collimation!

Started by siwek, 05/23/2003 07:17PM
Posted 05/23/2003 07:17PM Opening Post
Once again unencumbered by knowledge I came up with a Rube Goldberg way to do an STC collimation after installing some Bob's Knobs on a C8. I needed a daytime solution since it doesn't get dark(ish) here until about 9:45 PM.

1) I made an artificial star from one of those new keychain LED flashlights and a pinhole in a piece of aluminum foil. These little devils are impossibly bright, so I was able to see it easily on an overcast afternoon in Boston (is there any other kind now?).

2) I replace the phillips head adjustment screws with the new knobs as instructed. I quickly became frustrated by having to move back and forth while adjusting. There HAS to be a better way.....BONG!

3) I attached a Logitech QuickCam 4000 (Mogg adapter and field reducer) and started the native Logitech software application. I was collecting a nice fast frame image when the dullness left my mind and I realized that the Logitech Image Studio comes with an image ZOOM feature YES!

4) I zoomed the image to 300% and framed my out of focus "star" and collimated live on the laptop screen. SOOOO much easier! If you have a webcam give this a try even without the zoom feature.

By so doing I have now pretty much guaranteed that the clouds and rain will continue unabated for at least another three days. But then, what a perfect time to try this stunt. I also got a chance to clean the secondary.
Posted 05/24/2003 12:05PM #1
Donald-

At what distance from the mount do you put your artificial star?

Thanks

Carl
Posted 05/27/2003 04:54AM #2
Hi Donald,
I've collimated using a ccd camera, in focus mode taking continuous images every 3-4 seconds, zoomed in about the same. Thought I'd try it as I'm thinking of purchasing the hyperstar setup.