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Tani (Circle T) Ortho Question

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#1 mfoose

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Posted 24 March 2021 - 07:58 AM

I have been slowly accumulating circle T ortho to compliment my T6 Naglers and I found this unbranded 4mm ortho on eBay the other day for a reasonable price and bought it. I didn't see the typical circle T sticker on it, but I was hoping it was on the other side or circle T was stamped on the barrel. Unfortunately no sticker and the barrel has no makers mark stamped in it. Fortunately it is in great condition besides some slight wear on the barrel.

 

It looks identical in design, the only difference I have noticed is that the 4mm volcano top has a glossy finish compared to the 9mm, 12.5mm, and 18mm I already own. 

 

I think this one is circle T because it is just so similar. I think that the glossy finish simply means it was made during a separate batch, from what I know Tani was in business for a while, and the sticker either fell off or was taken off by a previous owner, but these are just my best guesses. Any way to confirm that an unbranded ortho is a circle T besides the sticker or makers mark? I know that there were some similar orthos that were not circle T, https://www.cloudyni...-glass-to-tani/ and I am trying to complete a set of unbranded circle T.

 

The last picture is the underside of the 4mm ortho next to the 9mm circle T.

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#2 deepwoods1

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Posted 24 March 2021 - 08:28 AM

Certainly looks like consistent quality construction. I can check tonight unless someone else chimes in. 


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#3 Terra Nova

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Posted 24 March 2021 - 09:12 AM

I’ll have to check it against my Edscorp 4mm Circle T volcano-top ortho which is heavy, well made, and optically wonderful in my Tak TC-76.


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#4 Terra Nova

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Posted 24 March 2021 - 10:40 AM

Here it is:

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#5 Terra Nova

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Posted 24 March 2021 - 10:41 AM

One more, this time on its side:

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#6 mfoose

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Posted 24 March 2021 - 11:15 AM

Thanks Terra! Looks like a carbon copy, but for the "EDSCORP" and the circle T. I did get to use it once with my Vixen 102 f/9.8 achro on the moon and while the seeing wasn't ideal, there were a few moments of clarity and it was very sharp! I plan to use it mostly on doubles.


Edited by mfoose, 24 March 2021 - 11:21 AM.

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#7 GreyDay

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Posted 25 March 2021 - 05:05 AM

I have been slowly accumulating circle T ortho to compliment my T6 Naglers and I found this unbranded 4mm ortho on eBay the other day for a reasonable price and bought it.

Circle T ortho's go for silly money here in the UK, they're both rare and pricey, typically £50-£60 ($70-$80) and rarely in mint condition. Baader BCO's cost less brand new and do a reasonable job for the cost. It'd be great to have a full set of Tani's to go with my classics, but i cant see them getting cheaper.


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#8 deepwoods1

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Posted 25 March 2021 - 11:55 AM

Looks to be the same as mine 4mm with the barrel removed. Slightly different production year. 

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#9 mfoose

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Posted 25 March 2021 - 03:08 PM

Looks to be the same as mine 4mm with the barrel removed. Slightly different production year. 

Thanks for this! Yes, it looks the same but for the black finish. You can even see that the gloss black on mine wasn't applied evenly around the threads. Some of that area is unpainted.

 

I wonder if the gloss finish was typical for early production and matte finish for later? Or if they were just out of matte finish during a production run and gloss was all that was available?

 

Anyways, it is very apparent that this is a Tani ortho.


Edited by mfoose, 25 March 2021 - 03:09 PM.

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#10 DIYDarren

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Posted 25 March 2021 - 05:12 PM

Hi all, I saw that ortho on eBay- I let you have it ;)   (I already have a 4mm like yours so no worries.)

 

Anyway, I agree it looks like a Circle T-  The finish on the older ones tends to be more glossy, with the very earliest ones being the most glossy and getting a bit more satiny over time. Then when it changed over to the "circle t" sticker those have a more textured paint. Assuming yours predates the Circle T sticker era, the marking would have been on the barrel. Makes me wonder if the barrels got swapped at some point. Though I was taught by other masters here (and have confirmed it myself) that there were many makers making very similar looking Orthos. 

 

The 4mm is awful small for dissection, but I have found that the circle Ts have always been Abbe orthos. (3 +1) where as some of the other volcano top "orthos" were symmetrics (2+2). So if you took the lenses out that would probably also help you identify. 

 

Enjoy! Darren


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#11 mfoose

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Posted 25 March 2021 - 08:45 PM

One thing I have noticed in some of my brief research is how different makers have tended to label these volcano top orthos. I have found this to generally be true, for volcano top orthos labeled on the diagonal section of the volcano top: "Or. #mm" and outward facing text are circle T, "OR #mm" outward facing text are circle minus, and any inward facing text tends to be circle v. Again, my research has been brief, but from classified ads and various pictures from forum sites seem to back up this general trend.


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#12 Chris K

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Posted 01 May 2021 - 09:23 PM

What does the circle-T mean?



#13 Terra Nova

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Posted 01 May 2021 - 10:40 PM

What does the circle-T mean?

An eyepiece with a barrel possessing an engraved or stamped circle with a capital T inside it denotes that the maker was the Japanese company Tani (not to be confused with the very similar maker’s mark for the Japanese telescope manufacturer Towa).

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