TAKO. INTERNET SEIT 1996.
Olympus-OM

[OM] Taking pictures of Mars

Subject: [OM] Taking pictures of Mars
From: Erwin Voogt <erwin.voogt@xxxxxx>
Date: Sat, 30 Jun 2001 22:20:06 +0200
Cc: o.greve@xxxxxxx, hcvanveluwen@xxxxxxxxx
Hi,

Olaf wrote:
stacked 3(!) 2x teleconverters between the OM-4Ti and my 300/4.5 to get an
effective 2400/36 tele-bazooka and had some fun spying on non-suspecting
neighbours (just kidding of course ;) ). Anyway, come nightfall, Mars should
up lovely again in bright yellow, so I decided to go for it, I spent a few
minutes finding the planet in the viewfinder of the camera, and what I
feared was indeed the case, at 48X magnification Mars did not show up bigger
than a needle's head in the viewfinder.
---
The angle of view of a 2400 mm "lens" is about 1 degree from corner to
corner. This year the size of Mars at opposition is 20.79". So on the
negative Mars will not be bigger than 20.79/3600*43 = 0.25 mm !!!
That's why you realy need a telescope and apply "oculair projection"
(correct English?) to take pictures of the planets. Even Jupiter and Venus
are just small dots without huge magnification.

Bye,

Erwin Voogt
Utrecht, The Netherlands
http://members.nbci.com/_XMCM/photovoogt/index.html



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