Can read the CCD Inspector results be made to fit on screen?

[cytan]

Hi,
I'm wondering there is an option to make the CCD inspector results smaller so that I can read all the results?
See picture that is attached.

Or is there a log that I read the results from?

Thanks!

cytan

P.S. I'm using the latest 18 Apr version.

[han.k]

Hello Cytan,

The font is adapted to the zoom factor. If you zoom in the font will be relative smaller and will fit on the image. Or just increase the program window.

Clear skies, Han

[cytan]

Hi Han
Thanks! I didn't realize that ASTAP wrote it. See attached files of zoomed in and zoomed out pictures

Sorry, I think the documentation is a little out of date. Can you please interpret the numbers for me:
1. Median HFD: 3.2 -> Is this good or bad?
2. Tilt HFD: 0.25 -> Looks like the top corners give this number (3.27-3.02) = 0.25. In % is 0.25/3.02 =8.2% <- Is this good or bad?
3. Off-axis abberation = -0.01. What does this mean? Does it mean that the FOV is flat?

Thanks!

cytan

[han.k]

1) A good or bad HFD is depending on your pixelsize and focal length. If the image is solved it indicates also the pixelsize in arcseconds. Yours is 4.1" which is very good. With my setup and sky, for long exposures I have typical a HFD 2.5 equivalent to 7". You HFD indicates that your sensor pixels are a little too small but's all theoratical and you can't change it.

2) That's normal. It's very sensitive. Your testing an image with only a few stars. A few hundered star would be better, so use a longer exposure.

3) That means that the outer stars have a median HFD value the same as the inner stars (centre). In many cases the stars in the outer regions of the image get an oval shape. This gives a higher HFD and that's reported. An other cause could be curvature. 0 is excellent. For my excellent APO the off axis abberation is 0.23 equavalent to about 10%. But again, your image has only few stars. Test again with a longer exposure/more stars visible.

The measument can vary a little with each exposure. The seeing, guiding could play a role.

Clear skies, Han

[cytan]

Hi Han,
Thanks for the explanation! I'll work on getting the data that you suggested. It'll be interesting to see how good/bad my setup is (which I just put together):

AP130GT + AP field flattener + SBIG STF8300 + SBIG OAG8300.

BTW, great program.

cytan