Eric,
What is your private e-maill address ? I have a couple of images of SN1999by that
i would like to send you. The one at the message head did not woirk.
take care
Alf J

Eric Schandall wrote:

> Jay,
> Can't speak from experience about the "auto" part of your question. I
> use a JMI NGSF Motofocus and use its control paddle. The control through
> the LX keypad I find less expressive so to speak.
> Have tried fine focusing using a thin stick accross the middle of the
> dew shield whose diffraction spike can be used for a good focus, then
> went to a three hole mask, then to using the focus routine in MaxIm DL.
> The three hole mask is useful for determining when you are intra or
> extra focused as the third hole will move above or below the other two.
> Paul Gitto has a good article on this mask on his web page.
> http://cometman.com/Mask.html
> Using a combination of star brightness and exposure settings that keep
> the pixel value to less than maximum, go from 4 x and 2 x binning to an
> unbinned image, refining each as well as you can both in appearance and
> by maximizing the pixel value. I find that enlarging the final focus
> images also helps.
> It would be quite difficult to obtain a fine focus using only mirror
> focusing, hence the Motofocus. It also requires very steady seeing to
> determine just how well you can ultimately do i.e. very minimal
> scintlation visually.
> At this point I really enjoy the 416XT. Wishing you the same.
> Regards,
> Eric

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