I bought two of these for solar eclipse / transit watching with my children and have seen the transit of mercury from a professional observatory in Georgia (Europe). When the oil ran out in the generators, the telescopes were closed down and I got the only transit picture from the national observatory of Abastumani! In Turkey, I was invited to view a £6000 hydrogen alpha telescope as the eclipse started - look! There are four sunspots!! No I said, looking at my £40 cardboard telescope, there are 6 sunspots - there were indeed - sometimes simplicity in the optical pathway leads to clearer images. Every year for over a decade I instructed my Science and Society class in the Kilkenny Baha'i Summer School to observe the sun with their own eyes - through this marvelous little wonder that is a small but very accurate lens / mirror and a projection telescope that folds to a pizza box. Its traveled the world and just captured a Mercury Transit 11/11/19. Brilliant.
I am considering a purchase of binoviewer to use with my 305/1500 collapsible SkyWatcher dob. I would like to use ADC for planetary viewing, hence I need at minimum a 2x barlow/f.extender. my question is: could the 2.6 GPC be placed before ADC, i.e. can additional 55mm of lightpath be introduced between the GPC and binoviewer (OTA -> 2.6 GPC -> ADC -> bino)? Focusing distance is not much of an issue, since mirror can easily be moved. I am more interested in understanding how GPC will behave - is it sort of telecentric or 2.6x effect with distance becomes 3x or more.
Our company exists now for more than 50 years. In this time, more than 15.000 Baader Planetariums (the first patented product of our company) help all over the world to give students an understanding of astronomical correlations. In our own manufactory, more than 500 observatory domes have been produced and delivered turnkey-ready. Instruments and telescope accessories from "Baader" are known for their high qualities by many astronomers and universities. We consider it our duty and obligation, not only to sell telescopes, but an indivdually selected telescope system, that brings you a lifetime of joy.