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Mozhoven
scholastic sledgehammer
Reged: 05/26/05
Posts: 884
Loc: Middletown, CT
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Hello,
I just bought a pair of 17mm Hyperions to use with my binoviewer currently on it's way to my home. In the meantime, I wanted to try them out mono in my PST. To my dismay, they won't come to focus. It's close, but not close enough. (actually, I accidently unscrewed the focus knob when I got to the end, luckily it screwed back on easily and doesn't seem to be any worse for the wear)
Basically, I'm concerned that they won't come to focus in my Denk binos with a PST corrector. Will there be some differences focus-wise that this combo will give me that will allow proper focus? Or is this a known problem? 
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Jeremy Davis
Sculptor & Certified Binoviewer Addict (CBA)
Orion XT12i - 12" f/4.9 "Alfred E. Newtonian"
Wyorock Custom Crayford
Denk Standards w/Dual PxS
PST (w/the "Good" Gold Objective)
12x60 Oberwerk Binos
www.jdavisgallery.com
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j3ffr0
sage
Reged: 07/06/08
Posts: 425
Loc: Virginia
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FWIW I've had problems with some EPs coming to focus in my PST. UO volcano top orthos will not focus in mine.
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10" Dob, 127mm Mak, 120mm f5 achro, PST
35, 24 Panoptic; 16, 13, 9, 3-6 Nagler
15, 10, 7.5, 5, 3.8 Ultrascopic
20, 15, 9, 6 Expanse
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Mozhoven
scholastic sledgehammer
Reged: 05/26/05
Posts: 884
Loc: Middletown, CT
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Can this problem be solved with a barlow? (like a binoviewer in a newt) Unfortunately, I don't have one right now to try.
--------------------
Jeremy Davis
Sculptor & Certified Binoviewer Addict (CBA)
Orion XT12i - 12" f/4.9 "Alfred E. Newtonian"
Wyorock Custom Crayford
Denk Standards w/Dual PxS
PST (w/the "Good" Gold Objective)
12x60 Oberwerk Binos
www.jdavisgallery.com
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molniyabeer
Confused and Asleep
Reged: 01/08/05
Posts: 2559
Loc: Central Coast, California
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Odd. I've used my 8mm and 24mm and didn't note any issues. The 8mm is my favorite general purpose eyepiece with the PST.
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Steve
16" Meade LightBridge (Beowulf)
10" Hardin DSH, StarMax 127mm Mak, PST H-a
Oberwerk 11 x 70 binocs, Tasco 10 x 50 binocs
Santa Maria Clear Sky Clock
Figueroa Mt Clear Sky Clock
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Ralph Marantino
Postmaster
Reged: 05/01/05
Posts: 6331
Loc: Old Bridge, New Jersey
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There MUST be a club thast you can hook up with in your area to help you out you dont HAVE to join to get practical on the spot education.
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Lunt H-alpha LS100THa/B3400
Rockland Astronomy Club
Member BAA Solar Section
Central Appalachian Astronomy Club
Astronomical League
DSPST,PST & 70mm Coronado Cal K telescope.2.2A
Zeiss 2 inch prism diagonal&Zeiss Zoom EP
2inch APM Herschel Wedge in a 94mm F7 Brandon
14.5 inch f4.2 Starmaster Dob(Zambuto mirror)
TeleView Genisis SDF with 1000 Oaks Glass filter
Zeiss 63mm f13.5 refractor 1000 Oaks Glass filter
Itty Bitty Solar Radio Telescope.
LHRIES Lite Solar Spectrometer
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Mozhoven
scholastic sledgehammer
Reged: 05/26/05
Posts: 884
Loc: Middletown, CT
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Ok, correction. It does come to focus after all. I had forgotten that I put in a 28mm extension (Tuning ring) before I tried it the first time.  Guess the sun was frying my brain. So, the 17mm as-is works, but does not with a tuning ring. 
So, we'll see if it works with the Denks. (with the tuning rings, that is...)
--------------------
Jeremy Davis
Sculptor & Certified Binoviewer Addict (CBA)
Orion XT12i - 12" f/4.9 "Alfred E. Newtonian"
Wyorock Custom Crayford
Denk Standards w/Dual PxS
PST (w/the "Good" Gold Objective)
12x60 Oberwerk Binos
www.jdavisgallery.com
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Mozhoven
scholastic sledgehammer
Reged: 05/26/05
Posts: 884
Loc: Middletown, CT
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Steve,
How do you find the eye placement with that 8mm Hyperion and the PST? It seemed very tricky to me with my 17mm, more so than any other EP I've ever used. A little left or right and you have complete blackout.
--------------------
Jeremy Davis
Sculptor & Certified Binoviewer Addict (CBA)
Orion XT12i - 12" f/4.9 "Alfred E. Newtonian"
Wyorock Custom Crayford
Denk Standards w/Dual PxS
PST (w/the "Good" Gold Objective)
12x60 Oberwerk Binos
www.jdavisgallery.com
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molniyabeer
Confused and Asleep
Reged: 01/08/05
Posts: 2559
Loc: Central Coast, California
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It is a little more unforgiving than some but when I am centered it does give me a really pleasing image. The other eyepiece I use is the 20mm (Kelner?) that came with the PST plus a 2x barlow. I've not tried the Cemax line but have not read enough to convince me to drop more cash there vs. elsewhere.
--------------------
Steve
16" Meade LightBridge (Beowulf)
10" Hardin DSH, StarMax 127mm Mak, PST H-a
Oberwerk 11 x 70 binocs, Tasco 10 x 50 binocs
Santa Maria Clear Sky Clock
Figueroa Mt Clear Sky Clock
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