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Reducer for the 128 Tak. FS?

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#1 dag55

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Posted 11 November 2012 - 01:57 PM

I am getting a 128 Tak. FS and can't find a reducer listed for these. I was wondering if there is a reducer for them or what reducer you use for the FS 128? Thanks for your help, Dane

#2 tomcody

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Posted 11 November 2012 - 05:13 PM

There was a dedicated reducer for that scope but it is no longer made, TNR has stated that the current reducer for the TOA130 is suitable to use, but note when looking up the backfocus distance in the Tak charts that the original one and the TOA reducers have different back focus distances, so use the correct one for the reducer that you get.
Rex

#3 johnnyha

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Posted 11 November 2012 - 05:14 PM

Keep in mind with a reducer in an FS128 you are spending a HUGE premium to get one lower fl view.

#4 dag55

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Posted 11 November 2012 - 05:23 PM

Thanks I will look at TNR and check out the TOA reducer and distances for both of the ones mentioned and the price as that will determine if it is worth the cost, thanks Dane

#5 tomcody

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Posted 11 November 2012 - 06:41 PM

If you look at the TNR site , at the picture of the TOA130 reducer, you can see it is marked TOA/FS right on it, but it is almost $900 now!
A lower cost option is the Televue reducer for the 102 F8 scope ( as I remember model 4087). This one costs less and is spaced at 55mm for DSLR cameras.
Rex

#6 chboss

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Posted 12 November 2012 - 01:49 AM

I own the original reducer for the TAK FS-102 and FS-128 I was lucky enough that it showed up one day on the used market. They seem to be pretty rare...

Here is an older picture shot with this combination:
http://aida.astroinf...ge.php?pid=4209

Other than that I use a TMB flattner originally designed for the WO FLT-110 that works well with a specially made adapter. But it does not decrease the focal length. I use it since it was cheaper used than the original flattner from Tak. Here a result with the WO/TMB flattener: http://aida.astroinf...ge.php?pid=4750

Hopefully you can find a reducer on the used market, the new parts are really expensive...

best regards
Chris

#7 art1942us

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Posted 13 November 2012 - 10:50 AM

The metal back distance for the TOA reducer is 83.7mm while the metal back distance for the FS reducer is 83.9mm.

#8 dag55

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Posted 13 November 2012 - 04:24 PM

Thanks for all the input, I don't want to spend 800+ dollars for a reducer but a used one at under 500 might be an option later. I will check out Televue's reducer in the meantime, Dane

#9 jsiska

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Posted 13 November 2012 - 09:25 PM

You could also consider the Optec NextGEN Ultra WideField 0.7XL focal reducer. The Takashi FS-128 has a focal ratio of f/8, and it just so happens that the Otec NextGen Ultra WideField 0.7XL is “Optimized for an f/8, the Ultra WideField 0.7XL will work for any focal ratio in the range of f/5.6 to f/20. The field is highly corrected up to 18mm in diameter and would work well even with larger fields with only slight degradation near the corners.”

The price for this Optec NextGEN Ultra WideField focal reducer is $275

From the Optec price list page:
“New parfocal 0.7X reduction telecompressor specifically designed to work with Apochromatic designs such as the Takahashi FS-series, Astrophysics’, and other high-end refractors. Four-element optical system delivers a flat field up to 18mm diagonal for CCD detectors. (NOTE: Order NextGEN CCD camera mounting plate separately above.)
[2-inch male barrel mount // OPTEC-2100 male dovetail]”





#10 dag55

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Posted 13 November 2012 - 09:47 PM

Thanks the Optec NextGen.7XL looks promising and the price doesn't hurt either,plus it should lower the F-ratio more than the .8 reducer Dane






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