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Lunk CaK first mod

Posted: Sun Apr 08, 2018 3:33 pm
by allhoest
After the internal inspection of the Lunt CaK, I went for a mod.
The filters for this test are as follow:
- Lacerta 2" Herschell with Brewster angle
- An Astronomic blue 2c, to cut any non necessary wavelength, including the IR (at up up to 1000nm)
- A Baader KLine
- The last filter of the Lunt CaK

The scope is a 100mm refractor + a x2 big barlow.
Only stacking and wavelets are provided. The same amount of wavelets for both presented pics.

Here, with the CaK mod setup:
Image




Here, with the gemuine CaK filter:
Image






:seesaw
I wonder the non uniformity of the CaK mod setup.
I find this mod setup providing less contrasted view.


CS
Alex
2018-Apr-06
Televue NP101
Powermate x2
Lunt CaK 1800
ASI174

Re: Lunk CaK first mod

Posted: Sun Apr 08, 2018 7:57 pm
by marktownley
Interesting results!

Re: Lunk CaK first mod

Posted: Tue Apr 10, 2018 5:07 pm
by allhoest
Mark, you have experience in modded CaK, I think.
Do you have any hint regarding the non uniformity?

CS
Alex

Re: Lunk CaK first mod

Posted: Tue Apr 10, 2018 7:36 pm
by marktownley
Looks to me like there is some vignetting going on