Anyone using an ALPY600 with C14?

Science Spectroscopy
1

My C14 EdgeHD + Guiding module + Calibration module

Can you please describe the connecting adapter between the C14 and the ALPY Calibration module?

I assume I will need a PreciseParts adapter and will need to provide the length in mm’s.

Thanks
Steve

2

Celestron informed me this would be the same connection for their 9.25" and 11" schmit cassagrains.

Thanks for your help
Steve

3

HI I have a C14 with a LISA so similar arrangement. I use the following setup.
AP ADASCTLC27 - 2.7" adapter threads onto rear cell of C14
AP ADA2003A - 2" adapter with brass locking ring (goes from adapter to 2")
AP CCDT67 - CCD Telecompressor
AP 10mm extension for 2.7"

This allows me to keep the science camera at 146mm back focus (considering the reducer) that minimizes backfocus issues with the Edge.

I find the rotating ability is useful if you ever need to do horizon adjustment (if you get too low to the horizon (<30d) you may need to rotate the slit to keep it parallel). Also the .67x reducer brings my C14 to F/7.6 which is needed for the LISA to be better performing. This also allows me to remove the spectrograph, and insert a camera with weights attached to quickly do a T-Point alignment when needed without a lot of hassle.

You may need some 48mm extensions between the reducer and the body of the ALPY, but those will be dependent on the path through the ALPY system.

Hope this helps.
keith

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IMG_2718 (002)3024×4032 2.19 MB

4

Thank you Keith, this helps me unravel a portion of my connection issues. The picture is particularly helpful. I have the Celestron Focal Reducer Lens (.7x).

I already own these adapters…
AP ADASCTLC27 - 2.7" adapter threads onto rear cell of C14
AP ADA2003A - 2" adapter with brass locking ring (goes from adapter to 2")

Thank you!!
Steve

5

Steve
I also have the C14 FR, but, it was so heavy, I changed to the AP unit.

6

Out of curiosity what mount are you using?

I would be using an AP-Mach2 to mount the C14.

Thanks
Steve

7

I am using a Paramount ME2. The problem is rear end weight and balance in dec. Even using a Optec SMSF (the secondary moves not the mirror) that extra weight was a pain. Had to add weights up front… Prior to the ME2 I had this on an AP1200. Worked fine so your Mach2 should be no problem.
Keith

1 Like
8

The distance from the slit to the front face of the calibration module is 64mm (34+30) so if you are using a focal reducer, the length of the T2 to SCT adapter should make up the distance to whatever is specified for the reducer

Cheers
Robin

9

Thank you Robin.

Steve