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#1
13-03-2010, 02:16 PM
 Higbyrichard (Richard) Starstruck! Join Date: Mar 2005 Location: St.Ives Sydney Posts: 31
Magnification with DMK Webcam

This is a copy of a post I dropped on the DMK Web Cam Site with no reply to date.

How does one calculate magnication using the DMK camera. I primarily image the Moon with a DMK 31AU through a Tak TOA 130F scope. (F /7.69 - 1000mm focal length).

The question is often asked by outsiders as to how close are we to the moon when they see the image on the laptop. I take a wild guess. There must be a way I can calculate the approximate apparent distance from the surface.

For example in this YouTube Clip I created for the local kids I guessed that we are about 1200 kilometers above the surface. In truth I have no real idea which worries me! I should be able to tell them. The focal length was 2000mm using a 2x Barlow.

I am sure the answer will make me feel stupid but I would appreciate any advice.
Many thanks
Richard. Sydney
www.astro.chigby.com
#2
13-03-2010, 02:44 PM
 iceman (Mike) Sir Post a Lot! Join Date: Sep 2004 Location: Gosford, NSW, Australia Posts: 36,709
Hi Richard

These two articles may help:

Calculating the Resolution of Solar System Images

Calculating Focal Length from Plate Scale

Cheers
#3
13-03-2010, 02:48 PM
 Higbyrichard (Richard) Starstruck! Join Date: Mar 2005 Location: St.Ives Sydney Posts: 31
Thanks Mike.

Appreciated.

Richard
#4
13-03-2010, 04:13 PM
 Higbyrichard (Richard) Starstruck! Join Date: Mar 2005 Location: St.Ives Sydney Posts: 31
HI Mike,

This is a bit more complex than I thought. Out of interest have you any idea what the magnification of a scope is (say 1000mm focal length) at prime focus without an ocular but using a ccd?

Richard

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