Re: Canon's new astrophoto DSLR announced



David Nakamoto wrote:
> Ah, I missed that. Don't webmeisters know us older guys and gals like larger
> lettering?! ^_^
>
> One thing I did think of though, and that I don't see, where it mentions if this
> camera can autoguide. If not, then you'll need either a very expensive mount to
> limit PEC, or get a separate autoguider to correct the tracking errors. Either
> way, for good deep sky images, this is going to be a possible issue, especially
> if you go deeper and deeper.
>
> On the other hand, the camera's 5 frames per second mode might be useful for
> planet and lunar imaging for use with stacking software to sharpen the images,
> but the 23 frames limit means you'll have to press the shutter often to get the
> couple of hundred images or so to successfully stack with good results.
>
> I wish they'd post the individual pixel sizes. Given the CMOS size, the number
> of pixels, and allowing for spacing between the pixels (pixel width 60% of
> available space) I figure pixels of 4 um horizontal. Anyone got the specs on
> this?
>
> I still look at the specs for this camera, and see a camera that's designed for
> dual roles, a general purpose camera and one that can be used for deep sky. But
> this is a compromise, and I don't see this as really affecting the sales of
> dedicated CCD cameras for Astronomy, which can autoguide, and have better
> sensitivity and signal to noise ratios.
>

Hi David:

You wouldn't be able to autoguide with it and image at the same time.
Autoguiders, in the form of the Meade DSI, the LPI, and modified
webcams are, however, cheap and plentiful.

OTOH, I rather doubt that the 5 frames per second frame rate would be
very effective for the planets. It's just hard to beat a webcam for
that, with its tiny pixels and .avi files.

Peace,
Rod Mollise
Author of _Choosing and Using a Schmidt Cassegrain Telescope_
Like SCTs and MCTs?
Check-out sct-user, the mailing list for CAT fanciers!
Goto <http://members.aol.com/RMOLLISE/index.html>

.

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