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PostPosted: Mon Jul 27, 2020 4:00 pm
by Tony Rodda
Hi Guys,

The photos below shows my UVEX3 and Calibrex guiding/calibration unit.

It works astonishingly well.

A few mods of course (!). Two x 50mm focal length doublets in the guider for better quality images, a Shelyak photometric slit used instead of the Alpy and a "larger" servo power board for stronger action. Otherwise it's the Nano control board as specified. I've added a 314L camera holder for the UVEX with multiple anchor points.

The photos show the calibration unit with the top removed and running the sequence of Wavelength, Flat and Dark/Bias frames.

I have Nano boards with bluetooth and wifi and paln to operate this wirelessly.

Thanks you for a most interesting project!

Kind Regards





PostPosted: Tue Jul 28, 2020 1:20 am
by Terry Bohlsen
How did you modify the slit holder to take the photometric slit?
I have a spare LISA slit but it is much larger than the holder. I may make a holder out of aluminium to accommodate the larger slit.


PostPosted: Tue Jul 28, 2020 9:28 am
by Tony Rodda
Hi Terry,

the photmetric slit is virtually the same mount/position as the Alpy air-spaced 'wheel'. They're interchangeable.
I might be wrong but it'll be very difficult to shoe-horn anything else in there!
The dimensions of slit-mirror-guide lens distances are very tight and you'll be hard pressed to keep collimation tolerances on the other side in the UVEX. The collimation mirror focuses within a millimetre!
I originally built the UVEX2 with the guide unit from the front half of Paul Gerlach's LowSpec last year plus my own designed calibration unit.
It worked well but, again, I was constrained by the UVEX dimensions/optics and not the guider.

Hope this helps.



PostPosted: Thu Jul 30, 2020 3:09 am
by Stephane Ubaud
Bravo Tony pour la realisation
n’hésite pas a comparer tes spectres avec ceux qui sont dans la base UVEX
Nous sommes très heureux de voir des UVEX dans la nature
Encore Félicitation

Bravo Tony for the achievement
do not hesitate to compare your spectra with those in the UVEX database
We are very happy to see UVEX in the wild
Congratulations again



PostPosted: Thu Jul 30, 2020 12:25 pm
by Tony Rodda
AG Peg with the UVEX3/Calibrex. Not yet quite happy with the screen placement for Flats but I'm close to getting that sorted.

AG Peg.png
AG Peg.png (61.21 KiB) Viewed 888 times


PostPosted: Thu Jul 30, 2020 12:29 pm
by Tony Rodda
PS guys...

The LEDs are very bright! I could read my street's signs when taking dark frames with the blue LED illuminated.

Is this a fault with the LEDs I bought or have you experienced the same thing?

I think they may need to be attenuated.