Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
oddog
member
Reged: 11/11/08
Posts: 72
|
|
I just got this Pentax 65 refractor from a friend to play with for a while. I can find NO information about it on CN, AM, or with a Google search. I did find a very similar scope but it was a 65ED APO and had a different looking objective (probably a collimatible cell) in AM classifieds. The box was identical to mine except for a sticker added declaring the ED-APO nature of the scope. In any event, is this an achromat? No collimatable cell, no markings other than 65mm objective and 700mm focal length and of course the Pentax name in numerous places. I looked at Jupiter briefly the night I got it (but of course the sky has been cloudy every night since) and the contrast was very impressive but it only came with a .965" 20mm Pentax Kellner so the image was pretty small. Not sure what I am going to do with this, I might keep it, I might sell it, might give it back to the owner. Any information would be appreciated, especially links to an instruction manual.
Thanks
Tom Duncan
Edited by oddog (10/27/09 12:49 AM)
|
galakuma
super member
Reged: 05/19/07
Posts: 167
Loc: Japan
|
|
Hi Tom.
There were two types to the telescope,Pentax 65.
The type of achromat was released in 1982.
The type of the apochromat was released in 1983.
The difference of two types had nothing without specifications of an object lens.
Edited by galakuma (10/27/09 09:51 AM)
|
Larry10
member
Reged: 06/16/03
Posts: 47
Loc: NE Ohio
|
|
Good luck with this one, Tom.
This was one of three achromats made available for a while in the U.S. In addition to the 65 there was an 85mm and a 100mm.
You'll find a reference to them in the October issues of Astronomy in at least 1987 and 1988. I also recall seeing a full page ad at one time on either Astronomy or S&T. I had a glossy Pentax brochure for this trio but there is no way in heaven I remember where I put it.
They were pricey. Full manufacturer retail price for the 65 was $1125.
You might try contacting Pentax USA in Colorado. They were the official distributor in the 80's
Larry
--------------------
Larry
|
Steve_M_M
scholastic sledgehammer
Reged: 06/09/04
Posts: 976
Loc: Moorpark, CA
|
|
There was also a 70mm.
--------------------
1956 Goto Optical 6" f15 Observatory Refractor
From the Titan Observatory as featured in S&T 1957-1959
&
1961 Nishimura 6" Reflector
|
oddog
member
Reged: 11/11/08
Posts: 72
|
|
Thanks all for your input. I took it out again last night to observe the moon and the contrast and lack of significant color fringing was amazing. If this is an achromat I would love to view through their APO. Owner wants to sell it, I don't want it, so what should we ask for it? Generally in very nice condition, a couple of rub marks on the green paint of the mount, a bit of marking on the tube from the plastic rests in the cradle, the cradle doesn't close on the tube as nicely as I would expect (but no apparent impact damage), and it is missing one of the EP's (6mm Ortho) as well as the sun projection screen and bracket. No instruction manual. Original cardboard box shows its age. Any and all suggestions welcome.
Tom Duncan
|
Steve_M_M
scholastic sledgehammer
Reged: 06/09/04
Posts: 976
Loc: Moorpark, CA
|
|
This should help. If yours has no diagonal, that could be a problem.
http://www.astromart.com/classifieds/details.asp?classified_id=360646
--------------------
1956 Goto Optical 6" f15 Observatory Refractor
From the Titan Observatory as featured in S&T 1957-1959
&
1961 Nishimura 6" Reflector
|
oddog
member
Reged: 11/11/08
Posts: 72
|
|
Thanks for the referral, I had seen that ad but wasn't sure what I could glean from it as it is 70mm. Not sure how not having the diagonal is a 'problem', it was not supplied with the scope, it was available as an accessory as were other items. I viewed Jupiter and the Moon again tonight with it, trying different EP's from my .965 collection and I see that the fringe color control is as much controlled by the EP as it is the objective. With the Pentax 20mm there is almost no fringing but with other average grade .965's of similar focal length there is more. With the Pentax EP the views are quite stunning. If I was more into lunar observing I would keep this in a heartbeat.
Edited by oddog (10/31/09 03:02 AM)
|
|
1 registered and 9 anonymous users are browsing this forum.
Moderator: RLTYS, Glassthrower, Clive Gibbons
Print Thread
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Thread views: 151
|
|
|
|
|
|
|
Previous
Index
Next
Threaded
Edit
Reply
Quote
[Re: 