60775Re: [ccd-newastro] focusing dslr
- Jan 1, 2008You can also use a separate focusing aid such as the Stilleto Mk IV which can sometimes be found second-hand on Astromart or similar sites for reasonable prices. A new one is in the order of about $250 (I think).
Bill Logan <wb9sat@...> wrote: Digital cameras, unlike film cameras must be fine focused on the pixel
level. You can get a rough focus through the viewfinder, but final focusing
must be done by looking at FWHM (Full-Width, Half Maximum) numbers. You can
use an inexpensive digital capture and processing program such as Stark-Labs
Nebulosity. Nebulosity has a fine focus routine that allows you to fine
focus using FWHM.
Robert Burnham Jr. Memorial Observatory
----- Original Message -----
From: "firebirdthart" <thart40@...>
Sent: Monday, December 31, 2007 5:36 PM
Subject: [ccd-newastro] focusing dslr
> Is there a better way to focus the canon xti than through the view
> finder, any way to send image to computer possibly?
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