H'alpha - double pass module

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
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p_zetner
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Re: H'alpha - double pass module

Post by p_zetner »

Hi Cata.

I think you have to be careful about this one and ensure that it is "image quality". An image quality filter should give lambda/4 (per inch at 632nm) transmitted wavefront distortion or better.

Peter.


Catalin Fus

Re: H'alpha - double pass module

Post by Catalin Fus »

Peter,

I have bought the other two units like HeII and TiO with normal specs and they are working great.

I'll try the CaK received today...probably in the next days, when it will be clear again...and I'll gladly publish the results :-)!!

Regards
Cata


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