+/- 90 degree and 000-100 Scales

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+/- 90 degree and 000-100 Scales

Postby psychobilly » Sun Jun 15, 2008 4:46 pm

Inspired again By Skywatcher I knocked these up...

They are availabe [url=http://www.btinternet.com/~psmithuk/stuff]Here[/url] in 150,300,600 and 1200 DPI formats...


I Have fitted the +/- 90 degree scales to my WO Field Flattner III and the 000-100 to the LHS knob of the Dual Spped Crayford Focuser on my "66"

Hope someone finds them useful...Use tahn as you will...

Billy...


p.s. Skywatcher your Mailbox is full [;)]


[image]http://www.btinternet.com/~psmithuk/stuff/DegreeScale150DPI.jpg[/image]

[image]http://www.btinternet.com/~psmithuk/stuff/RotationScale.jpg[/image]


[image]http://www.btinternet.com/~psmithuk/stuff/FocusScale150DPI.jpg[/image]

[image]http://www.btinternet.com/~psmithuk/stuff/FocusScale.jpg[/image]

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RE: +/- 90 degree and 000-100 Scales

Postby andrew shields » Sun Jun 15, 2008 5:20 pm

what are they used for?
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RE: +/- 90 degree and 000-100 Scales

Postby psychobilly » Sun Jun 15, 2008 5:36 pm

They are for...

Pre-setting the rotation of the camera to frame an object . The 3 rotational scales are because of the 3 points at which the FF setup can be rotated,

and pre-setting the focus back to a pre-determined starting point on the focuser when you change setups etc...

Billy...

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RE: +/- 90 degree and 000-100 Scales

Postby brianb » Sun Jun 15, 2008 6:26 pm

[quote]Pre-setting the rotation of the camera to frame an object [/quote]
Why oh why do they not make sensors circular? The area of acceptable image formed by the telescope [i]is[/i] circular ... if the sensor was circular too, you would just crop the image to whatever aspect ratio you wanted, with minimal wastage of live pixels. And no need to pre-orientate the camera.
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RE: +/- 90 degree and 000-100 Scales

Postby psychobilly » Sun Jun 15, 2008 6:26 pm

Yeah and while their at it why dont they make TV's circular and cut the corners off all the pictures is the art galleries of the world...hehe..[8|]
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RE: +/- 90 degree and 000-100 Scales

Postby Chanctonbury » Sun Jun 15, 2008 6:43 pm

[quote]p.s. Skywatcher your Mailbox is full [/quote]

Cheers, Billy, I have now emptied it!

I am pleased that the scales are working out for you - simple idea but does the job and ensures repeatability within reasonable limits. I have designed a vernier scale too but frankly life is too short to go that far especially as the various attachment components don't normally run flush up against one another!
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