stephenramsden
Carpal Tunnel
Reged: 08/17/07
Posts: 1622
Loc: Atlanta, GA--USA
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I got the PST back again from Meade on Monday. I took it out to the outreach today and the focuser has the exact same image shift as both times before.
They are sending me a new case, stand and an 18mm CEMAX eyepiece for my trouble.
The VP says that all PST's have image shift in the focuser mechanism and that mine is "within tolerances".
Does anyone else with a PST get an image shift when they turn their focuser? My other PST does not.
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Stephen W. Ramsden
Atlanta, GA--USA
NASA SOLAR SYSTEM AMBASSADOR
www.solarastrophotography.com
www.SolarScopeReviews.com
www.stephenramsden.com
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darkstar528
Postmaster
Reged: 03/06/07
Posts: 7382
Loc: Hodgenville, Kentucky, USA
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Not sure what you mean by image shift...
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Blue skies,
Stephen "Darkstar" Ames
PST(#96038), VIXEN 8-24mm,CEMAX 2x Barlow, Thousand Oaks White Light Filter and a Meade Elec EP
CFI, CFII, MEI, working on EIEIO!
BAA Member
My solar site:
http://seemysunspot.com
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colinsk
Carpal Tunnel
Reged: 01/17/08
Posts: 2170
Loc: CA
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If you are saying the image moves side to side (or up and down) as you focus then my PST has none. I have my pentaprism aligned perfectly square to the optical train and there is no play in the focus mechanism.
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Mahalo,
Colin Kaminski
Coulter 10.1" Dobsonian
TV-76/Baader Film White Light
LS60T/DS50/FT/BF1200
LDX-75
AT Voyager
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dengwer
super member
Reged: 02/14/06
Posts: 161
Loc: Texas
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I have not noticed any image shift in my PST.
David
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ETX125AT
Wife's ETX90RA
Orion Ultra-View 10x50
Meade 12" Lightbridge Deluxe
coronado PST
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solmax
Carpal Tunnel
Reged: 02/26/06
Posts: 1629
Loc: San Jose Ca.
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Same here no shifting.
Adrian.
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stephenramsden
Carpal Tunnel
Reged: 08/17/07
Posts: 1622
Loc: Atlanta, GA--USA
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With an 18mm CEMAX eyepice in my PST I get a shake back andd forth of the solar image by about half the solar diameter whenever I turn the focus knob.
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Stephen W. Ramsden
Atlanta, GA--USA
NASA SOLAR SYSTEM AMBASSADOR
www.solarastrophotography.com
www.SolarScopeReviews.com
www.stephenramsden.com
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stephenramsden
Carpal Tunnel
Reged: 08/17/07
Posts: 1622
Loc: Atlanta, GA--USA
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Colin when you say you have it aligned perfectly, is this something you did. Because when I looked in there, there was a screw attached to a black plastic part that fit in a slot onthe inside of the black box. There was a pentaprism glued to the black plastic part. the black box cover held it in place.
I saw no adjustable parts except for spring tension.
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Stephen W. Ramsden
Atlanta, GA--USA
NASA SOLAR SYSTEM AMBASSADOR
www.solarastrophotography.com
www.SolarScopeReviews.com
www.stephenramsden.com
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j3ffr0
professor emeritus
Reged: 07/06/08
Posts: 522
Loc: Virginia
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I believe I get a minor amount of image shift. I'll pay more attention next time I take it out. Some of it could be the way I position the mount for quick looks.
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XT10i, C8, Apex127, ST120, AT72ED, PST
35/24 Pan; 16/13/9/3-6 Nagler
15/10/7.5/5/3.8 Ultrascopic
20/15/9/6 Expanse
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colinsk
Carpal Tunnel
Reged: 01/17/08
Posts: 2170
Loc: CA
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Quote:
Colin when you say you have it aligned perfectly, is this something you did. Because when I looked in there, there was a screw attached to a black plastic part that fit in a slot onthe inside of the black box. There was a pentaprism glued to the black plastic part. the black box cover held it in place.
I saw no adjustable parts except for spring tension.
Discussions of opening the PST are not allowed on this forum.
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Mahalo,
Colin Kaminski
Coulter 10.1" Dobsonian
TV-76/Baader Film White Light
LS60T/DS50/FT/BF1200
LDX-75
AT Voyager
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Don W
Demi-God
Reged: 05/19/03
Posts: 15124
Loc: Wisconsin, USA
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Not so. Discussions of altering it once it's opened are not allowed.
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Don Wyman
Obsession 18" f/4.5 #1166
W/Argo Navis DSC and Torus Primary
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Ralph Marantino
Postmaster
Reged: 05/01/05
Posts: 6350
Loc: Old Bridge, New Jersey
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mine ain't shifty. 
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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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pennyandchris
professor emeritus
Reged: 01/30/07
Posts: 677
Loc: Horsham, England
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Only image shift I ever saw on my PSTs was due to a sloppy mount (photo tripod). On a nice solid mount (LXD75) there was zero shift.
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Orion UK OMC140 Mak Cass
TeleVue Ranger
Coronado Ha and CaK PSTs
Meade LXD75 mount
Ambermile alt-az mount on wooden surveyors tripod
Manfrotto 074 photo tripod with 501 head
+ various binocs
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Daniel
scholastic sledgehammer
Reged: 06/16/05
Posts: 917
Loc: Roscoe,IL
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WOW... now thats a good one! image shift. I bet they spent over 10,000 in meetings trying to come up with excuses to cover their butts on the craftsmanship that goes into repairing them.
I think with all the problems they have had with repairs... replacing them would be the way to go. I mean... really. If it takes a week to a month to actually repair the darn things. The payroll alone is not worth it!! Figure in health care and unemployment costs,then workers comp fee's... heck. They could send you 2 new scopes for the cost spent on repairing ONE scope!
Just my opinion... AGAIN...
Image shift.... Get the @#$% outa here ya bums! there aint no such thing on a PST. IMO....
In fact, every PST I have looked through has NO image sfift at all. I have looked through more than 20 of them.
They tride to bribe you with goodies to get you to shut up on their goof up. I personally would keep the goodies, send the scope back, and say it is NOT RIGHT. I would sacrifice the use of my scope to get it right. eventually they will realize they cannot fix it, and just give you a new scope... I bet...
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Looking for a big ol Dobsonian..12-16"
ETX 70mm,F5
Bushnell 7-21x40 bino's
Barska 20x80mm Binos
Meade Video Eyepiece
Canon A-E1 SLR,Canon EOS ElanII
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stephenramsden
Carpal Tunnel
Reged: 08/17/07
Posts: 1622
Loc: Atlanta, GA--USA
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Well, I am sorry anyway. I certainly don't want to jeopardize my membership to this forum as it has been invaluable to me in my solar hobby.
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Jim Rosenstock
Post Laureate
Reged: 07/14/05
Posts: 4151
Loc: MD, south of the DC Nebula
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Quote:
Not so. Discussions of altering it once it's opened are not allowed.
How about discussions of dropping one over a cliff? 
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darkstar528
Postmaster
Reged: 03/06/07
Posts: 7382
Loc: Hodgenville, Kentucky, USA
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I'm very disappointed in how they've treated this and pray I never have a problem...
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Blue skies,
Stephen "Darkstar" Ames
PST(#96038), VIXEN 8-24mm,CEMAX 2x Barlow, Thousand Oaks White Light Filter and a Meade Elec EP
CFI, CFII, MEI, working on EIEIO!
BAA Member
My solar site:
http://seemysunspot.com
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DAVIDG
Carpal Tunnel
Reged: 12/02/04
Posts: 2127
Loc: Hockessin, De
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If you have image shift, it is most likely it is coming from the prism getting hung up it the track and tilting back and fourth. I have none in mine. Since we can discuss opening and looking into the system, then I would watch the prism has you turn the focusing knob. It should move smoothly up and down the track and both 90 degree faces of the prism should stay exactly parallel to the sides of the metal housing were the telescope screws in and then eyepiece tube is mounted. Turn the focuser so the prism is at the top of it's travel. In that position the top face of the prism should be exactly parallel to the inside top face of the black metal housing. If not your prism is misaligned. Also there is piece of friction material mounted to the side of the prism that contacts the inside face of the cover. Besure that is positioned so it is mounted flat on the side of prism. Too much friction between the cover and the friction material can be causing the prism to rock as it is being focused.
- Dave
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Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schief. 60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 14 Stellafane awards 7 in optics
Engineering = Taking what you have and making what you need.
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DAVIDG
Carpal Tunnel
Reged: 12/02/04
Posts: 2127
Loc: Hockessin, De
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Here is link to the patent for how the penta prism focuser works http://www.designerinlight.com/solar/solarpatents/07248405.pdf
Note in the drawings how the top and left side of the penta prism are exactly 90.0 degrees to the light path. If your prism is tilted and not like the drawing in the patent then it is misaligned. If it is rocking back and forth and not staying exactly 90.0 degrees to the entering and exiting light path, this will cause image shift.
- Dave
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Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schief. 60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 14 Stellafane awards 7 in optics
Engineering = Taking what you have and making what you need.
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stephenramsden
Carpal Tunnel
Reged: 08/17/07
Posts: 1622
Loc: Atlanta, GA--USA
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Daniel,
Exactly my thinking.
I am trying to keep this from a Meade bashing post at the urging of the moderators.
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Stephen W. Ramsden
Atlanta, GA--USA
NASA SOLAR SYSTEM AMBASSADOR
www.solarastrophotography.com
www.SolarScopeReviews.com
www.stephenramsden.com
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Zoomster
professor emeritus
Reged: 01/30/05
Posts: 722
Loc: Tampa FL
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No shift on mine, focus has always worked well, now if you want to talk sweet spots... lol, just kidding.
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Celestron CPC 1100 aka "The Marino"
Moonlite Dual Rate Focuser
WO Dielecric Diagonal
Denkmeier "Big Easy" Binos and assorted eyepieces.
Coranado PST
SPC900NC...not modded...yet. (eh-eh)
Is God willing to prevent evil, but not able? Then he is not omnipotent. Is he able, but not willing? Then he is malevolent. Is he both able and willing? Then whence cometh evil? Is he neither able nor willing? Then why call him God?
Epicurus
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