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who is doing the final polishing and figuring?

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Takahashi grinds and polishes these lens blanks from Ohara.

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While Tak does the optical work on their own mirrors and they do design their own refractor objectives, the production refractor lenses themselves are outsourced through Canon. This has been mentioned by Art at TNR on the Takahashi Yahoo Group several times in the past.

Tak does set the lens spacing and collimation in house though.

---John

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the production refractor lenses themselves are outsourced through Canon. This has been mentioned by Art at TNR on the Takahashi Yahoo Group several times in the past.

Tak does set the lens spacing and collimation in house though.

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the production refractor lenses themselves are outsourced through Canon. This has been mentioned by Art at TNR on the Takahashi Yahoo Group several times in the past.

Tak does set the lens spacing and collimation in house though.

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According a private conversation with Art years ago, this is only true for telescopes with Fluorite elements. For the Sky-90 and the FS-60C.

The ED glass (and all other elements) for the lens blanks on the TOA, TSA are purchased from Ohara, grinds, polishes and multicoated by Tak.

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I can only go on what Art himself has posted on the matter in other forums and even here on CN early last year:
link

Through the years I have seen many posts on the Tak Group, A-Mart Forums, and even some here on CN where Art goes into this.

---John

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What do you think about a Tak TOA 130 with the EM 200 mount? Is that a good setup?

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What does that package come with?

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What will I need for my 5D Mark II along with those things?

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I understand that the TOAs (at least the 150s) have been susceptible to misalignment due to jarring. In fact, I think Takahashi made changes to the TOA-150 cell early on to combat this. You're talking big, heavy lens cells with large (glass-insulated) air pockets between them. The difficulty of execution of this design was undertaken for one purpose - color correction for imaging. I suspect the TOAs will be more apt to come out of alignment over time as a result, but who knows.

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I wonder where did you find information regarding this..."misalignment" issue.
As a member of Yahoo Tak users, and Takahashi community on Facebook...I have never ever heard a TOA-150 user complaining about lens misalignment.
Please provide "evidence" (a link or something), I'm interesting in learning more.

Teo

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Takahashi TOA-13OS
Zeiss Abbe II ortho set + 2X Barlow

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Not sure if I ever posted my issue on the Tak group, but.....

I bought my toa-150 used, found out later that evening, and 7 hours away, that it was really far out of collimation. Was sent back to Art and Fred at TNR. They said the cell was bad, replaced it with a brand new one direct from Japan, and only charged a small amount for the labor. Luckily the guy I bought it from stood behind it and covered all the expenses of which shipping was the biggest. Now I have basically a brand new scope, particularly since I upgraded to the B model focuser.

So yes it has happened in the past to more than just me but I believe Tak as taken care of what ever caused the problem.

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TNR really does stand by their TAK scopes. As far as the issue with the older TAKs, it seems the older batch of TOA150's had issues with the cell coming loose from being jarred. This was corrected with replacement parts for them. I should know, my order for a new TOA150F delayed since no more new TAKs were coming into the U.S. from Japan until Takahashi corrected the issue. My 150F was brand new off assembly line with the new upgraded cell compartment so I never had an issue. I had a TOA130S that I sold when my order of TOA150 finally came in. I was sorry I sold the TOA130, I considered it one of the best scopes (for it's size) I ever owned. The focuser was ok but I had upgraded it with the Feather touch micro focuser. A real nice piece of equipment to have....

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Wow. This thread is still going.

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Keeps going, and going, and going,,,,,,,,,,,

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Mike:

My question was "when" as in "when (i.e., month/year approximately) was the interruption of deliveries" that you describe. I'm trying to figure out how long from the first shipment into the US it took to discover the issues and then address it.

It's good that they did what they should have done to remedy a design defect, but I think that's to be expected. Even Orion fixes problems of its own or its manufacturer's making.

Regards,

Jim

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Moondust, please keep in mind that the scopes (AP130/140) that you have compared the focal-point differ by 231mm in favor of AP140. Compared to the TEC/TOA, 20mm focal-point difference in favor of the TOA. The focal-point can play a role in comparing these scopes.

AP 130 : F6.3 (819mm)
AP 140 : F7.5 (1050mm)

TOA130 : F7.7 (1000mm)
TEC140 : F7 (980mm)

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Well, that's fantastic! The more folks that carry and push Yuri's scopes the better. And you could not ask for a better bunch to work with than the folks at OPT.

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