Image of the day

Captured by
Mark Eby

IC1396 Cepheus Bubble Nebula

About Astromart

My Account

New to Astromart?

Register an account...

Need Help?

Vari-Extender

Started by ivanong, 02/27/2003 07:00PM
Post Reply
Posted 02/27/2003 07:00PM Opening Post
Ivan Ong
View public profile Send a private message to Ivan Ong Find more posts by Ivan Ong Find threads started by Ivan Ong
Forum Member

Join Date: Jan 2003

Location: Charlotte NC, US

Posts: 632

Is the Tak Vari-Extender/tube system essentially a barlow-type optic with adjustable focal length?

Ivan

Quote
Posted 03/01/2003 04:55PM #1
Hal Coward
View public profile Send a private message to Hal Coward Find more posts by Hal Coward Find threads started by Hal Coward
Forum Member

Join Date: Jun 2001

Location: Sugar Land TX, US

Posts: 11

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
Quote
Post Reply

Funding Member

Telescopes, Astronomy, Binoculars

Sponsors


View all sponsors

Search