From: Mark Gaffney <markgaffney@me.com>

Date: January 20, 2010 11:56:54 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Re: New AstroIIDC user


Milton, 

I think Alan & Kurt are talking about the non FMT7 800 x 600 pixel size aren`t they? The 814 x 618 pixel image log for my movies had a fps reading I think wheras the log I found for the 800 x 600 pixels one has just an exposure reading of 0.05ms..?Anyway I`ve had a quick look at Fly capture on my PC & it has an "enable" FMT7 selector but  the image scale dosen`t seem to change from 800 x 600 pixels on any mode?This is shooting a blank-no scope but out the door into the light! I don`t know enough about it at this stage! If Alan`s timed it that`s good enough for me..! As to collimation here`s a couple of Jupiter snapshots from last time I shot it,  the first at prime focus the other with a 2x barlow & the Scorpion, I believe. I had tried to adjust collimation until I had the clearest view of Jupiter`s stripes through the 25mm eyepiece..

Mail Attachment  1__#$!@%!#__Mail Attachment

I can`t promise I`ll look at collimation of the scope any time soon (it`s cloudy tonight for instance..!)


Mark.

On 21/01/2010, at 4:37 PM, Milton Aupperle wrote:

Mark;

They aren't using FMT7 with ROI, they are just using 800x600 size. And
the camera hardware is doing the binning, not Astro IIDC in Software.

Also, according to the capture log, Live Flats and Darks were not used
for your image.

It's probably flat with little sharp detail because it could be

1) Poor focus
2) Poorly Collimated Telescope
3) Turbulence

Any of those will soften the image.

Here is how you tell if your collimated properly or not with an SCT:

http://sctscopes.net/SCT_Tips/Maintenance/Collimation/collimation.html

and this article shows the difference between poor and perfect
collimation:

http://legault.perso.sfr.fr/collim.html

HTH..

Milton Aupperle

On 20-Jan-10, at 9:55 PM, Mark Gaffney wrote:

> Hi Alan,
> I did find my 800 x 600 Scorpion ROI images & capture details. This
> was earlier on with a full moon-actually the set of images, one of
> which which you altered for me in Photoshop. I don`t know if it`ll
> tell you anything (I have binning turned off in this one.. dark
> frame subtraction & flat frame correction are turned on which may be
> a clue to why the images were washed out?
> <Snapshot 2010-01-21 15-36-09.jpg> <Snapshot 2010-01-21 15-37-45.jpg>