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I've stacked two 1.7s, not that handyThe ME 1.7 does not change the function of the eyepiece, it just multiplies whatever mag the eyepiece has by 1.7x for each one you put on.
An S/ATX 95/115 goes from 30-70 to 51-119 with one ME and 87-202 with two
An S/ATX 65/85 goes from 25-60 to 42.5-102 with one ME and 72-173.5 with two
A BTX 95/115 goes from 35 to 59.5 with one ME and 101 with two
A BTX 65/85 goes from 30 to 51 with one ME and 87 with two
There's not much change in brightness during daylight hours going from 0 to 1 ME, but adding a 2nd makes it notably darker. Basically good for astronomy and little else. I've never tried 3 of them. YMMV
The ME 1.7 does not change the function of the eyepiece, it just multiplies whatever mag the eyepiece has by 1.7x for each one you put on.
An S/ATX 95/115 goes from 30-70 to 51-119 with one ME and 87-202 with two
An S/ATX 65/85 goes from 25-60 to 42.5-102 with one ME and 72-173.5 with two
A BTX 95/115 goes from 35 to 59.5 with one ME and 101 with two
A BTX 65/85 goes from 30 to 51 with one ME and 87 with two
There's not much change in brightness during daylight hours going from 0 to 1 ME, but adding a 2nd makes it notably darker. Basically good for astronomy and little else. I've never tried 3 of them. YMMV
Appears some have missed what your asking for.
I would imagine an extender that allowed for variable zoom would not only be extremely expensive to pair with the BTX but also cumbersome and large for an already large optic. You would essentially be putting another entire spotting scope in-between the BTX eyepiece and the objective. I also dont know how well culmination would be for the BTX
IF it was plausible i would imagine it would have been done by now or at time of making the BTX.
At this point you might consider building your own set of big eyes out of two swaro STC spotting scopes.