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Re: [OM] 1-8 Astrophoto screen and focusing.

Subject: Re: [OM] 1-8 Astrophoto screen and focusing.
From: "Carlos J. Santisteban Salinas" <cjss@xxxxxxxxxxxxx>
Date: Mon, 13 Oct 2003 20:27:29 +0200
Hi, all.

I've made a quick comparison between 1-8 & 2-4 screens, with 21/3.5, 28/2 &
200/4 Zuikos.

The 2-4 is brighter than the 1-8, and shows more contrast. However, the
good thing about the 1-8 is that it keeps showing sort of *two* images: one
showing the (de)focusing, and another almost always sharp... this way is
very easy to focus on pin-point, high contrast subjects -- that is, stars
;-) You can compare the size of the 'sharp' star with the size of the
'blurred' star; any difference means focusing error. In a word, *superb*
for astrophotography.

With the 200/4, it's easy to fine focus, especially on high contrast
subjects. But with the 21/3.5, especially on low contrast, dim light
scenes, the 2-4 looks much better. The 28/2 seems OK with both screens,
though.

As for depth-of-field preview, the 2-4 wins again -- the 'always-sharp'
added image on the 1-8 is confusing here.

Hope this helps,

...

Carlos J. Santisteban

<cjss@xxxxxxxxxxxxx>
<http://cjss.galeon.com>



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