Telescope Reviews: AFOV and PST?

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Don Trinko
sage

Reged: 07/05/09
Posts: 314
Loc: Ohio

AFOV and PST? new

#3446415 - 11/13/09 05:32 PM

If I get an EP with a larger AFOV will the sun stay in the feild of view longer or does the PST limit the feild of view? Thanks; Don T.

--------------------
Nexstar 8SE
Celestron C6
Orion 4.5 Starblaster OTA
Meade DS2130at-lnt
Astro-Tech 66mm
Coranado PST 40mm
Celestron 9x63 Binoculars
Nikon 7x35 Binoculars
EP's 8 to 24 Zuhmell, 8 to 24 Hyperion, 8 to 24 TV, 32mm TV, 12.5 Astro-Tech Paradime, Celestron 40,26,9.7 plossel,
Zuhmell 32,12.5,6,4 plossel , TMB 5,3.2, planitary II.

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brianb11213
Post Laureate

Reged: 02/25/09
Posts: 3312
Loc: 55.215N 6.554W

Re: AFOV and PST? new

[Re: Don Trinko]
#3446459 - 11/13/09 05:51 PM

Quote:

does the PST limit the feild of view?

Yes ... even the 20mm Kellner that comes with the PST is limited by the scope rather than its own field stop.

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Don Trinko
sage

Reged: 07/05/09
Posts: 314
Loc: Ohio

Re: AFOV and PST? new

[Re: brianb11213]
#3446479 - 11/13/09 06:06 PM

Thanks; Not much sense in a high dollar high AFOV EP then!

Don T.

--------------------
Nexstar 8SE
Celestron C6
Orion 4.5 Starblaster OTA
Meade DS2130at-lnt
Astro-Tech 66mm
Coranado PST 40mm
Celestron 9x63 Binoculars
Nikon 7x35 Binoculars
EP's 8 to 24 Zuhmell, 8 to 24 Hyperion, 8 to 24 TV, 32mm TV, 12.5 Astro-Tech Paradime, Celestron 40,26,9.7 plossel,
Zuhmell 32,12.5,6,4 plossel , TMB 5,3.2, planitary II.

Post Extras:

brianb11213
Post Laureate

Reged: 02/25/09
Posts: 3312
Loc: 55.215N 6.554W

Re: AFOV and PST? new

[Re: Don Trinko]
#3446492 - 11/13/09 06:13 PM

Quote:

Not much sense in a high dollar high AFOV EP then!

Given the 1A passband of the etalon in the PST, the crucial thing about EPs for the PST is delivering lots of contrast. IMHO the Baader Genuine Orthos are about the best currently manufactured EPs to use with the PST (in 18mm, 12.5mm and 9mm focal lengths ... the others are too short). TMB monocentrics may be better and Zeiss monocentrics certainly are, but at a price where you'd be investing in a Solarscope rather than a PST.

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Don Trinko
sage

Reged: 07/05/09
Posts: 314
Loc: Ohio

Re: AFOV and PST? [Re: brianb11213]
#3446523 - 11/13/09 06:25 PM

Thanks; I'm using a AstroTech paradime 12.5mm at the moment. It seems to work better than the 20mm Kellner.
Don T.

--------------------
Nexstar 8SE
Celestron C6
Orion 4.5 Starblaster OTA
Meade DS2130at-lnt
Astro-Tech 66mm
Coranado PST 40mm
Celestron 9x63 Binoculars
Nikon 7x35 Binoculars
EP's 8 to 24 Zuhmell, 8 to 24 Hyperion, 8 to 24 TV, 32mm TV, 12.5 Astro-Tech Paradime, Celestron 40,26,9.7 plossel,
Zuhmell 32,12.5,6,4 plossel , TMB 5,3.2, planitary II.

Post Extras:

brianb11213
Post Laureate

Reged: 02/25/09
Posts: 3312
Loc: 55.215N 6.554W

Re: AFOV and PST? new

[Re: Don Trinko]
#3446654 - 11/13/09 07:27 PM

Quote:

It seems to work better than the 20mm Kellner.

Most things do!

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