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Also what is relevant is what size sensor you planning on using. A KAF8300 is not very demanding but a full frame 11002 is and 16803 even more.
I don't have direct knowledge of the Tak reducers/flatteners but basically no they don't stack on top of each other. They each have their metal back distances and are designed like other manufacturers as stand alone items.
I use a Tak 4 inch flattener on both my TEC180 and AP140 and it works beautifully whereas a 4 inch reducer and 16803 chip gave 3/4 of the field good stars and some distortions in the corners. The AP 155TCC telecompressor gives .7X reduction as well as flattening but that is a pricey unit and has a tolerance of +/- 1mm for spacing. Tak has high end reducers as well for the TOA scopes. The little 35mm one is pretty ordinary but no doubt works well for small sensors but not full frame.
Generally speaking full frame or above size sensors need a large 3.5 to 4 inch focuser and a 2.7 inch may not do it. I was unable to get a FS152 with a 2.7 inch focuser to run an STL11 with anything. Swapping out to a 4 inch focuser and 4 inch accessories worked though.
The AP155 TCC is adaptable to other scopes in my case a TEC180 (yet to be tested but it came off a TEC160 and worked).
2.7 inch focusers seem to be able to handle up to APS sized sensors (1.6 X crop). Just a general comment and not specific to TSA 102.
Greg.
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