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Does anyone know anything about these eyepieces from Scoptech?

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22 replies to this topic

#1 mtminnesota

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Posted 03 March 2021 - 01:55 AM

"Plossl orthoscopics"?  Astro Hutech just started selling them this week.  The price is too low to pass up, so I ordered a 14mm to fill a gap in my eyepiece range.  That one has the widest FOV in the range (53 deg) and 12mm eye relief.  Who makes them, and how good are they?

 

https://astrohutech....a_st-or=st-or14


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#2 RFeaster

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Posted 03 March 2021 - 02:04 AM

It looks very much like the Takahashi Starbase orthos:  LINK

 

I have the 14mm Starbase & can confirm that the AFOV is larger than 50°


Edited by RFeaster, 03 March 2021 - 02:06 AM.

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#3 CosmoSat

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Posted 03 March 2021 - 03:19 AM

If of a similar design, strangely on the 14 is mentioned as 53°. Tak still claims 45 tho.
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#4 Avgvstvs

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Posted 03 March 2021 - 03:35 AM

Looks fine but you won't know till you look through it. But you get what you pay for.

I suspect for the price they will be nothing like the Takahashi's mentioned above.

In the old days there were Orthoscopic's or Plossl's being different EP designs.

I've never heard of an Orthoscopic Plossl, but I could be showing my age.

Personally I would opt for something with a larger AFOV at 14mm

Good luck and let us know if they are any good


Edited by Avgvstvs, 03 March 2021 - 03:39 AM.

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#5 mtminnesota

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Posted 03 March 2021 - 04:17 AM

It looks very much like the Takahashi Starbase orthos:  LINK

 

I have the 14mm Starbase & can confirm that the AFOV is larger than 50°

Mystery solved, thanks!


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#6 mikeDnight

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Posted 03 March 2021 - 04:31 AM

It's been said that the term "orthoscopic" is more a condition than a design. Orthoscopic's produce a nearly perfect view, so a well designed plossl such as those produced by Televue, five element pseudo Masuyama's such as the amazing Ultrascopic and Ultima, and even more complex designs such as Pentax XW's can be thought of as being very orthoscopic in nature.


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#7 25585

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Posted 03 March 2021 - 07:25 AM

It's been said that the term "orthoscopic" is more a condition than a design. Orthoscopic's produce a nearly perfect view, so a well designed plossl such as those produced by Televue, five element pseudo Masuyama's such as the amazing Ultrascopic and Ultima, and even more complex designs such as Pentax XW's can be thought of as being very orthoscopic in nature.

Also Brandons.


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#8 MartinPond

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Posted 03 March 2021 - 08:29 AM

Past about 55 degrees,

no eyepiece can be said to be orthoscopic.

Nothing against any type, it's just that

a lot of geometric distortion is needed

to keep focus. It's a mapping thing. 

 

Abbes, Symmetric Plossls, RKEs, and 1,2-Konigs

   are very "orthoscopic", if they stay near or under 50-degrees.

For reading linearly-marked meters like dosimeters, pressure gauges,

  golf-distance monoculars, or measurement/inspection loupes,

  the 1,2-Konig  is most commonly fitted with a reticle.  

A 1,1 symmetric Ramsden is sometimes used, but with a color filter.


Edited by MartinPond, 03 March 2021 - 08:50 AM.

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#9 RedzoneMN

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Posted 03 March 2021 - 09:17 AM

Past about 55 degrees,

no eyepiece can be said to be orthoscopic.

Nothing against any type, it's just that

a lot of geometric distortion is needed

to keep focus. It's a mapping thing. 

 

Abbes, Symmetric Plossls, RKEs, and 1,2-Konigs

   are very "orthoscopic", if they stay near or under 50-degrees.

For reading linearly-marked meters like dosimeters, pressure gauges,

  golf-distance monoculars, or measurement/inspection loupes,

  the 1,2-Konig  is most commonly fitted with a reticle.  

A 1,1 symmetric Ramsden is sometimes used, but with a color filter.

Would the Tak LE’s qualify?


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#10 Russ S.

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Posted 03 March 2021 - 11:01 AM

Made in Japan is a nice surprise, which would make sense if they're copies of the Tak Starbases, for that price I'd assume they'd have to be from China. According to reviews the Tak SB's are more plossls than orthos, but has characteristics of both, thus the coined name I guess. They are apparently best at f/10 and slower. Very interesting, hope you'll update us with a report when it arrives  

 

https://www.cloudyni...e#entry10132991

 

https://www.cloudyni...er-any-reviews/


Edited by Russ S., 03 March 2021 - 11:07 AM.

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#11 mtminnesota

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Posted 03 March 2021 - 11:50 AM

Made in Japan is a nice surprise, which would make sense if they're copies of the Tak Starbases, for that price I'd assume they'd have to be from China. According to reviews the Tak SB's are more plossls than orthos, but has characteristics of both, thus the coined name I guess. They are apparently best at f/10 and slower. Very interesting, hope you'll update us with a report when it arrives

https://www.cloudyni...e#entry10132991

https://www.cloudyni...er-any-reviews/


They do sound good for the money, but nothing exceptional so I canceled my order. I'm starting to accumulate too many eyepieces, and I need to stick to the best of the best if I add any more.
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#12 Russ S.

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Posted 03 March 2021 - 12:10 PM

They do sound good for the money, but nothing exceptional so I canceled my order. I'm starting to accumulate too many eyepieces, and I need to stick to the best of the best if I add any more.

Ha, I keep looking for hidden gems too, but also don't want to keep collecting good but not great EP's! They may be ideal for slow scopes though 


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#13 csrlice12

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Posted 03 March 2021 - 12:22 PM

Find some old Meade Research Grade orthos....



#14 Russ S.

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Posted 03 March 2021 - 01:29 PM

Find some old Meade Research Grade orthos....

Or just get a TV plossl, I like it better than a similar size RG I have. A lot easier to come by and cheaper too


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#15 epee

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Posted 03 March 2021 - 01:49 PM

Odd that the description says, "single coat".thinking1.gif



#16 Starman1

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Posted 03 March 2021 - 02:25 PM

Review of the Starbase orthos:

https://www.cloudyni...ght/?p=10086030

https://www.cloudyni...ght/?p=10089551


Edited by Starman1, 03 March 2021 - 02:26 PM.

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#17 mikeDnight

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Posted 03 March 2021 - 05:55 PM

Would the Tak LE’s qualify?

I'd imagine some of them would, with possibly the exception of the 30mm LE, which is really very poor towards the edge, or at least mine was.



#18 BillP

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Posted 03 March 2021 - 06:01 PM

Don provided link to my assessment.  Beautiful build.  But the single coat for these means ghosts and stray light issues here and there.  A Symmetrical is not so hot in that department when only single coated.  If you want a good single coat, then get an RKE.


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#19 jimandlaura26

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Posted 12 April 2021 - 01:10 AM

I use the Tak Starbase Orthos (and Kellners) on my 150mm f/12 SkyWatcher Mak-Cass and Lunt 60mm f/8.3 H-alpha solar telescopes. They perform very well. 



#20 SandyHouTex

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Posted 12 April 2021 - 05:55 PM

I have the whole set and use them in my Tak Starbase 80mm refractor.  They are excellent, well-built eyepieces.



#21 RichA

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Posted 12 April 2021 - 11:32 PM

It's been said that the term "orthoscopic" is more a condition than a design. Orthoscopic's produce a nearly perfect view, so a well designed plossl such as those produced by Televue, five element pseudo Masuyama's such as the amazing Ultrascopic and Ultima, and even more complex designs such as Pentax XW's can be thought of as being very orthoscopic in nature.

 

 

It's been said that the term "orthoscopic" is more a condition than a design. Orthoscopic's produce a nearly perfect view, so a well designed plossl such as those produced by Televue, five element pseudo Masuyama's such as the amazing Ultrascopic and Ultima, and even more complex designs such as Pentax XW's can be thought of as being very orthoscopic in nature.

These hybridized Symmetricals.  Are they actually orthoscopic, without distortion?  I've never seen any Plossl or Plossl derivative that functioned exactly like an Abbe ortho.


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#22 Jon Isaacs

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Posted 13 April 2021 - 04:06 AM

It's been said that the term "orthoscopic" is more a condition than a design. Orthoscopic's produce a nearly perfect view, so a well designed plossl such as those produced by Televue, five element pseudo Masuyama's such as the amazing Ultrascopic and Ultima, and even more complex designs such as Pentax XW's can be thought of as being very orthoscopic in nature.

 

Orthoscopic means an undistorted field of view, it doesn't mean an aberration free field of view.  A nearly perfect view would be free of aberrations.

 

I'm not sure an eyepiece with a 53 degree AFoV can be free of distortion.

 

Jon



#23 SandyHouTex

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Posted 13 April 2021 - 04:58 PM

These hybridized Symmetricals.  Are they actually orthoscopic, without distortion?  I've never seen any Plossl or Plossl derivative that functioned exactly like an Abbe ortho.

I agree.  I’ve never heard anyone claim that plossls (symmetricals really) are orthoscopic.




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