Re: [APML] Need Help Focusing Telephoto Lens

["John C. Mirtle" <jmirtle@shaw.ca>]

Check out http://members.shaw.ca/jmirtle/ha.htm . This technique works with any
telephoto, perform the tests at the fastest f-ratio. Use regular film instead of
tech-pan, and do the tests without the hydrogen-alpha filter. I do this with all
my telephotos.

John Mirtle
Calgary, Ab. Canada

----- Original Message -----
From: "Kevin Wigell" <kwemail@twcny.rr.com>
To: "APML Discussion List" <astro-photo@seds.org>
Sent: Wednesday, December 12, 2001 3:52 PM
Subject: [APML] Need Help Focusing Telephoto Lens


> Hello, APMLer's, I need some help. I'm fairly new at AP and have been mostly
> lurking here for several months. My problem is getting consistent focus when

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