Image of the day

Captured by
edward registrato

Newly Discovred Supernova in M 101

My Account

New to Astromart?

Register an account...

Need Help?


Started by ivanong, 02/27/2003 11:00AM
Posted 02/27/2003 11:00AM Opening Post
Is the Tak Vari-Extender/tube system essentially a barlow-type optic with adjustable focal length?


Posted 03/01/2003 08:55AM #1
Hi Ivan,

I'm no optical expert, but I think it is essentially as you describe. Attached is a 35mm lunar shot through a Mewlon 180, vari-extender, and three extender rings for an effective focal ratio of f36. Gives an idea of image scale. The original film image is much sharper - my inexpert scanning and reduction of file size has blurred it considerably.

Hal Coward

Attached Image:

hcoward's attachment for post 65375