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Reason 1:
I cannot see the return beam spot on the end of the laser collimator because it sits 60mm up into the draw tube as viewed from inside the OTA. If I were able to insert the focuser further into the draw tube as I can do on my GSO focuser I could easily see the spot. Yes there are other collimators available but so are there other focusers.
Reason 2:
The Paracorr type 1 has a 60mm nosepiece. I can only insert 45mm and as a result cannot achieve focus. Again I have no problem with the GSO focuser.
I cannot fathom why a focuser design would provide a stop to prevent accessories being fully inserted other than to prevent items slipping in and hitting the mirror. I cannot think of a single accessory that is 2" diameter along its entire body and if there is one out there it would not be common enough to require this annoying safety feature.
Both of the reasons I mentioned are common applications that other focuser manufacturers have accommodated.
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