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Transit of Mercury in the Spicule Layer. Phil took this great image with his Quantum 6 Scope, Solar Spectrum etalon and PGR Camera.

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Look where I've placed my PST Mod Focus

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Starry Jack
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Look where I've placed my PST Mod Focus

Post by Starry Jack » Wed Jul 10, 2019 2:27 am

With these images, where should I be placing my PST Mod?

SCOPE: 152mm with PST Stage 2 with 5mm BF Stock eyepiece holder. 1:7 Glasspath right in front of the etalon.

I have placed the ruler on a consistent spot on the mount. The Sun comes to focus at 210mm. When I place the PST Mod body into the focuser (2nd image) where should I space out the blocking filter (the line midway on the stock PST eyepiece holder)? Or is it really a matter of where the camera chip lies?

Thanks,
Jack
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Explore Scientific 152mm f6.5 achromat
Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
ZWO174 (IMX249 chip 5um)
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marktownley
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Re: Look where I've placed my PST Mod Focus

Post by marktownley » Wed Jul 10, 2019 6:45 am

The front collimating lens of the etalon assembly needs to be at the zero point of the ruler in the first shot.
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Starry Jack
Im an EXPERT!
Im an EXPERT!
Posts: 378
Joined: Tue Feb 03, 2015 3:44 pm

Re: Look where I've placed my PST Mod Focus

Post by Starry Jack » Wed Jul 10, 2019 1:03 pm

Mark,
That makes all the sense in the world and I don’t understand why I did not grasp that fact until now. I can’t wait to make the change soon. You may have opened up a new direction for me when this works.

Respectfully,
Jack
Explore Scientific 152mm f6.5 achromat
Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
ZWO174 (IMX249 chip 5um)
Huge Sense of Adventure Viewing Creation

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