Doublestack PST Mod + Quark

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Starry Jack
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Doublestack PST Mod + Quark

Post by Starry Jack »

What is your optical train when you use the PST and Quark?

Specifically, do you use the BF on the mod? I just tried in 3 minutes time between THICK clouds:
152mm f6.5 to glasspath to PST Stage 2 Mod minues BF to Quark to 12nm to camera.

Hard to tell because of the soupy thick clouds, but I did achieve focus and could get an image.

I'll try again when the clouds are gone.

Thanks,


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Re: Doublestack PST Mod + Quark

Post by marktownley »

Nope, Naked PST etalon goes after the Quark and before the camera. Your way will put the Quark at f10, and while it will work will be getting dark I imagine.


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Re: Doublestack PST Mod + Quark

Post by Starry Jack »

You're a smart cookie, Mark.
I did focus, but it was dark.

It was nice to get the PST Stage 2 Mod out again, but I was reminded how I really dislike tuning and dislike the sweet spot.

For tuning, I can never tell when I've hit the spot.

Thanks for the comments,
Jack


Explore Scientific 152mm f6.5 achromat
Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
12nm Filter
ZWO174 (IMX249 chip 5um)
Huge Sense of Adventure Viewing Creation
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Re: Doublestack PST Mod + Quark

Post by Starry Jack »

Mark,
I cannot find a thread outlining a PST Etalon + Quark doublestack...do you know of one or of any placement/distance parameters?

Thanks,
Jack


Explore Scientific 152mm f6.5 achromat
Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
12nm Filter
ZWO174 (IMX249 chip 5um)
Huge Sense of Adventure Viewing Creation
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Re: Doublestack PST Mod + Quark

Post by AndiesHandyHandies »

Hi

If you use a Combo Quark, with a 2x Tele-extender for F20 or 3x Tele-extender for F30 in front, can you then DS with the Quark after a PST Stage 2 Mod?

Using a 35nm Baader as ERF can you use no BF on the PST Mod2 and then rely on the BF on the Quark?

Does the Quark have a circular polariser in it and will it help with PST Etalon reflections?

Cheers. Andrew.


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Re: Doublestack PST Mod + Quark

Post by AndiesHandyHandies »

Hi

Valery said 'Double stack with Quark + PST etalon without it's lenses.'

Does that mean the PST etalon after the Quark and it works in the tele-centric beam?


Christian says in his site the PST does work at F30 despite the theory saying otherwise.

Cheers. Andrew.


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Re: Doublestack PST Mod + Quark

Post by marktownley »

AndiesHandyHandies wrote: Mon Nov 09, 2020 11:09 am Hi

Valery said 'Double stack with Quark + PST etalon without it's lenses.'

Does that mean the PST etalon after the Quark and it works in the tele-centric beam?


Christian says in his site the PST does work at F30 despite the theory saying otherwise.

Cheers. Andrew.
Simple answer - yes.


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Re: Doublestack PST Mod + Quark

Post by AndiesHandyHandies »

Hi

Is that yes to both?

Cheers. Andrew.


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Re: Doublestack PST Mod + Quark

Post by marktownley »

AndiesHandyHandies wrote: Mon Nov 09, 2020 11:45 am Hi

Is that yes to both?

Cheers. Andrew.
A solid etalon has a polarised output.


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