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I use one of these on the back end of my old 4" f15- it provides views far superior to my thousand oaks front glass. One thing to note, after being bounced from dealer to dealer I was finally advised by Takahashi Japan that they do not reccomend using these on the FSQ - but I am aware of plenty of people who use them on TV NP101s with no ill effect. I've heard anecdotally about an FSQ that did suffer damage to the rear doublet.
Obviously not a problem with your TSA- and well worth it. I would advise you to get polarizing filters for both 1.25" and 2", plus get the Lunt 2" to 1.25" adapter as there is no recessed slot in the 2" holder for a typical adapter's set screw.
Cheers,
Andrew.
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