Re: [MaxImDL] Question about autoguiders


Feb 17 7:55 AM

 


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#1514 Feb 17 7:55 AM

I was reading recently about diffraction spike focusing and noted that

Paul Lefevre's site (lefevre.darkhorizons.org) suggests that the camera's

x-y axes be oriented 45 degrees from the orientation of the spikes, so

that the spikes did not fall along the edges of pixel rows or columns and

thus it would be easier to detect small changes in focus.



This makes good sense. I'm wondering if the same is true about

autoguiding. I've always tried to get my autoguider oriented as closely

as possible to the two axes of my mount. Now I'm wondering if it makes

more sense for it -not- to be oriented this way? Would the autoguiding

software be better able to detect small displacements if the head were

oriented slightly off from the mount's axes? Or even at 45 degrees from

them?



Next time out, I think I'll do some experimentation, but if anyone has

experience with this (or simply wants to ruminate), I'd be eager to hear

and discuss it.



Cheers,

Paul Sterngold







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#1524 Feb 18 12:13 PM

Paul Sterngold wrote: >

> I was reading recently about diffraction spike focusing and noted that

> Paul Lefevre's site (lefevre.darkhorizons.org) suggests that the camera's

> x-y axes be oriented 45 degrees from the orientation of the spikes, so

> that the spikes did not fall along the edges of pixel rows or columns and

> thus it would be easier to detect small changes in focus.

>

> This makes good sense. I'm wondering if the same is true about

> autoguiding. I've always tried to get my autoguider oriented as closely

> as possible to the two axes of my mount. Now I'm wondering if it makes

> more sense for it -not- to be oriented this way? Would the autoguiding

> software be better able to detect small displacements if the head were

> oriented slightly off from the mount's axes? Or even at 45 degrees from

> them?

>

> Next time out, I think I'll do some experimentation, but if anyone has

> experience with this (or simply wants to ruminate), I'd be eager to hear

> and discuss it.



There is no advantage in orienting the array at 45 degrees. If anything, there

might be a small argument in favour of orienting the camera along the axes.

However, it doesn't matter in MaxIm DL/CCD Version 3; it will autoguide no

matter which way you turn the camera.



Doug



---------------



Doug George

dgeorge@...



Diffraction Limited

Makers of Cyanogen Imaging Products

www.cyanogen.com



100 Craig Henry Drive, Unit 106,

Ottawa, Ontario, Canada, K2G 5W3



Phone: (613) 225-2732

Fax: (613) 225-9688



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