Re: [APML] OT: Pleiades

["Stuart Heggie" <Stuart.J.Heggie@sympatico.ca>]

Chuck, this is a MAJOR upgrade to the DSLR - the ability to focus using the
LCD as you've described. That and the TC and AC power and a big flash card
as you said. Very interesting...Thanks for explaining that.

Stuart
----- Original Message ----- 
From: "Chuck Vaughn" <aa6g@aa6g.org>

> The 20Da has a special live focus mode that displays either the
> center 4% or center 1% of the chip with a rapid update on the rear
> LCD. I can see at least down to mag 8 stars in this mode. Just turn
> the focus on your scope until the centered star becomes the smallest
> image. Brighter stars tend to be blobs and fainter stars are closer
> to points.
>
> This is not as deterministic as FWHM on a computer display but I
> haven't had anything I could call a focus failure so far.
>
> There's also a separate timer-controller that lets you set the
> exposure time from 1 sec to 99 hours, time between exposures, and
> number of exposures up to 99. The TC battery is supposed to be good
> for 3 years. There's no on/off switch. :-)
>
> I don't know if the camera battery pack would last all night but
> there is an AC adapter that supplies the required 3 VDC. It would not
> be hard to modify the cable to accept a 2 D-cell battery pack.
>
> Using the Pleiades for an example, I focused first, then set up as
> for any film exposure. I set the TC to 18 exposures, 10 minutes long,
> and I use 15 seconds between exposures. Then I went to bed for 3
> hours. :-) This does not allow for image dithering which is another
> discussion probably not appropriate here.
>
> Chuck
>

_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo