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Pentax Telescopes & Mounts

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#1 coinboy1

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Posted 22 August 2017 - 09:13 PM

I have recently become infatuated with Pentax telescopes after doing some research on them. To me, they seem nearly the quality of Takahashi and made in Japan. Unfortunately Pentax stop making telescopes in 2008. Also it seems not many were imported here to the U.S. There is some information here on CN for Pentax telescopes, but not so much mounts.

 

I found this website: http://familystar.or...5&topic=25782.0

 

It has a brief history on Pentax telescopes with great pictures, you will want to use Google Translate to read through it all but it is absolutely fascinating to me. Anyone have any experience with Pentax equatorial mounts? I have heard of the MS-2, MS-3, MS-4, and MS-5 mounts but haven't really seen any specifications on them. It would be really cool to have people post pictures and any pertinent information here on their Pentax telescopes and mounts. Thanks! 

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#2 Stew44

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Posted 22 August 2017 - 09:29 PM

I have the 100, and the 70, and used to have the 85 that are shown in the black and white leaflet.

 

Have the pier mount for the 100 as well as the extruded aluminum legs.  Will get some pictures out here of the 100.  It is pretty impressiven and performance is first rate.


Edited by Stew44, 22 August 2017 - 09:30 PM.

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#3 rolo

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Posted 22 August 2017 - 10:27 PM

I've had a few Pentax scopes and one mount. A 75SDHF a 105SDHF and a couple of older achromats, a Pentax 100 and Pentax 85 which share the same mount.

The SDHF models are mainly for deep space imaging and are superb for that but they're not high power planetary scopes. A Takahashi FS102 and Vixen 102FL will easily outperform the 105SDHF for that.

 

The 100 and 85 achromats are as good as it gets for an achromat. There was also an ED triplet version of the 100 that is said to surpass the Nikon counterpart. The mount was okay but I wasn't impressed. Its stable enough but no amount of adjusting left me satisfied with its performance. Below is a picture of my old somewhat rare Pentax 100

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#4 rolo

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Posted 22 August 2017 - 10:31 PM

Build quality is as good or better than Takahashi. Here's the 75SDHF. Below is the configuration of both versions.

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Edited by rolo, 22 August 2017 - 10:42 PM.

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#5 rolo

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Posted 22 August 2017 - 10:37 PM

Also had a Pentax J60 that was very nice, the mount is one of the best alt az mounts I've used. Worm and gear on both axis.

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#6 Stew44

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Posted 23 August 2017 - 05:39 AM

Here's my 100 achromat on pier.  Mount wonderfully stable; telescope, best achromat performance I have seen in a 4", and at f/12 as well (so good on color I thought ED for quite some time, but now accept that it's only an achromat).

 

P6090410.jpg


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#7 mitsos68

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Posted 23 August 2017 - 08:15 AM

Hi,

some museum pieces here:

 

https://www.cloudyni...telescope-r3040

 

 

Regards

 

Dimitris


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#8 Stew44

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Posted 23 August 2017 - 09:51 AM

Hi,

some museum pieces here:

 

https://www.cloudyni...telescope-r3040

 

 

Regards

 

Dimitris

How can one not be drooling over what is present at this place!  Thanks for sharing this again.



#9 Chuck Hards

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Posted 23 August 2017 - 10:18 AM

I recently looked at the objective of my J60 under double-pass autocollimation, using a 133LPI Ronchi grid.  I was surprised to see that the lines were not as straight as the objective on my older Asahi Pentax 60mm objective, and even older Asahi Jupiter 60mm.  Very surprised!


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#10 rolo

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Posted 23 August 2017 - 10:43 AM

I'm surprised how these Japanese classics have shown optical quality all over the place. Some are just plain dawgs! I believe you Tested a Zeiss 50/540 that didn't test very well. Just goes to show that you can't judge an entire brand based on a few DPAC results. I'm starting to believe it's on an per scope  basis. 


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#11 Stew44

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Posted 23 August 2017 - 11:53 AM

I had a Pentax 50mm tabletop. The twin Tasco 6TE had a better star test. All three of the f12s (70,85,100) are great optically

#12 Chuck Hards

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Posted 23 August 2017 - 12:54 PM

I'm surprised how these Japanese classics have shown optical quality all over the place. Some are just plain dawgs! I believe you Tested a Zeiss 50/540 that didn't test very well. Just goes to show that you can't judge an entire brand based on a few DPAC results. I'm starting to believe it's on an per scope  basis. 

 

Nor can you judge a brand based on reputation.  I buy one Zeiss, it's not that great.  Makes me a lot less likely to buy another Zeiss.  At least Pentax is running at only 20% bad with me, not 100%.  


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#13 stevep

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Posted 24 August 2017 - 07:22 PM

Agree with this, Qc is what it's all about, and from experience Pentax seemed to be on top of it,

I have owned 4, still have 2, mid 50's Jupiter yoke fork mount, optics very good, but not excellent, did not have the snap

to focus, now it a museum in Spain, J 80  OTA, optics excellent, previous owner and following owner remarked on how good it was, someone is enjoying it here in the UK, 100 F12 Achro, I would have to agree with Rolo, this is about as good as it can get for a 4'' Achro, and I've looked through a good few, and the very rare 100 f12 ED Apo,  I don't know if it's better than the NIkon f12, I was tempted to purchase a Nikon when one came up for sale in Europe for a comparison, but way to expensive for my pocket, so that comparison will have to wait !

 

Steve



#14 Stew44

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Posted 24 August 2017 - 07:59 PM

Agree with this, Qc is what it's all about, and from experience Pentax seemed to be on top of it,

I have owned 4, still have 2, mid 50's Jupiter yoke fork mount, optics very good, but not excellent, did not have the snap

to focus, now it a museum in Spain, J 80  OTA, optics excellent, previous owner and following owner remarked on how good it was, someone is enjoying it here in the UK, 100 F12 Achro, I would have to agree with Rolo, this is about as good as it can get for a 4'' Achro, and I've looked through a good few, and the very rare 100 f12 ED Apo,  I don't know if it's better than the NIkon f12, I was tempted to purchase a Nikon when one came up for sale in Europe for a comparison, but way to expensive for my pocket, so that comparison will have to wait !

 

Steve

I'd venture the Pentax 100 would beat that Nikon.  Probably the best achromat 100 (at f/12 even) that I've used and folks I greatly respect thought it an ED refractor.   Probably my favorite over a very nice Unitron that Johann now has, and even my Goto.


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#15 Chuck Hards

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Posted 24 August 2017 - 09:05 PM

I'd venture the Pentax 100 would beat that Nikon.   Probably my favorite over a very nice Unitron that Johann now has, and even my Goto.

 

 

 

lalalala.gif


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#16 Stew44

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Posted 24 August 2017 - 09:31 PM

😜
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#17 coinboy1

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Posted 25 August 2017 - 06:30 AM

I have something coming in the mail for me....smile.gif

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#18 khalil

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Posted 25 August 2017 - 06:31 AM

Hello tony

 

Nice to see you again , i thing you don't open your account anymore.

 

Kindly check your inbox

 

Khalil



#19 coinboy1

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Posted 25 August 2017 - 10:31 AM

A few more pictures from the seller. Will write a full review when I get the scope in!

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#20 SteveGR

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Posted 25 August 2017 - 11:21 AM

I've never used a Pentax scope, but I knew a guy who shot with Pentax cameras and glass, and some of those lenses were really nice.  It would make sense that their scopes would be good.  If I'm not wrong, I think Takahashi has their glass made by the same division that makes Canon camera lenses.  So, they go hand in hand.


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#21 Stew44

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Posted 25 August 2017 - 11:22 AM

The Pentax diagonal.  Unique to Pentax scopes as nose piece is not typical diameter.  I was fortunate to get a Pentax 1.25 diagonal with my 4" and two Pentax 1.25" Barlows.  The hole underneath the prism is for the solar projection plate holder rod.


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#22 terraclarke

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Posted 25 August 2017 - 11:32 AM

Wow! That Pentax 75ED is gorgeous. My brother has the Pentax 75mm ED and the 65mm ED; just the OTAs in the original Japanese packaging. Seems they were 18 to 20 years old? They were amazing when I looked through them. IIRC, the 65mm was longer/slower than the 75? 


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#23 dyslexic nam

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Posted 25 August 2017 - 12:13 PM

So I haven't been on CN in well over a month, and when I decide to check back in there is a Pentax scopes thread at the top of the Classics page.  Fate.

 

I love vintage Pentax gear, though my "collection" is pretty modest.  I have a 50mm Asahi (yoke) table top scope, a J60-c (short achro) and two J80s, with the second one (both scope and mount) making a strong argument for being parted out to help restore other J80's/J60's that may need some assistance.  I also have a few representatives from the vintage ep sets that are probably my favourite eps. 

 

A few more pictures from the seller. Will write a full review when I get the scope in!

I think this solves the question of where that particular series of ep's came from (I have the same 6mm ortho that is pictured).  I think it has generally been pegged between the SMC orthos and the older orthos/kellners that came with the 85/100 scopes (both ED and achro).  I think the inclusion of this ep with the 75 would help confirm that timeline, assuming it is a contemporary of the scope itself.  This is the first time I have seen it in the context of a scope.  A bit of discussion on the eps here:

 

https://www.cloudyni...ntax-ep-series/


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#24 Jon Isaacs

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Posted 25 August 2017 - 02:09 PM

I recently looked at the objective of my J60 under double-pass autocollimation, using a 133LPI Ronchi grid.  I was surprised to see that the lines were not as straight as the objective on my older Asahi Pentax 60mm objective, and even older Asahi Jupiter 60mm.  Very surprised!

 

I had two of the older 60 mm x 800 mm Asahi Pentax refractors and really enjoyed them. In part, this was because I had found two odd ball Burgess Optical diagonal eyepiece holders that fit the non standard visual back threading of the A-Ps visual back so I was able to use 1.25 inch eyepieces..

 

I briefly had a J60 but it had a 0.965" visual back and drawtube and I preferred the views of the older Asahi-Pentax..

 

What is the difference between Asahi-Pentax and Pentax, what the history there?

 

Hon


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#25 vvalmiki

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Posted 25 August 2017 - 02:34 PM

I have something coming in the mail for me....smile.gif

Is this the one that was for sale in Sacramento?

 

Regards, Vinay




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