OTAs are actually the lesser of your worries if you plan to use a binoviewer (BV). Most SW 120EDs have unbeatable optics for their price, but are mechanically limited
If you get decent optics and it is well collimated, it has an excellent value for money. In fact, optically Stellarvue I think it gave them problems, as I read in these same forums, and that is why it has finally stopped selling them. A vendor and hobbyist here in Spain told me that Sky-Watcher has better quality control than the factory that these tubes come from. have a tube in the focus group that can be removed to accommodate the binoviewer. These telescopes that are sold under brand names like TS, Altair, Tecnosky, Stellarvue, etc.
#PHOTOLINE CHANGE TO 321 BIT TV#
Eyepiece design made a difference but I was not willing to compromise as I was comparing a BV with Plossls verses a single TV Nagler.Īs for optical performance I don't think there is much difference between those 2 but my experience is limited of those.Įdited by photoracer18, 10 February 2021 - 05:33 PM. Would not make it using a 1.25" diagonal either by a small amount. The BV would not reach focus without using a 1.5x 2" Barlow in front of the 2" diagonal (about 2.25x). My first refractor attempt was using a Vixen ED114SS at F5.3. I was a beta tester for Denkmeier at their beginning. There is no existing focuser that can be put in the same position with the same height that could be used for everything including mono viewing because it would need a focuser with a 6.5" travel. The scope I have, the original SV102ABV, at around F8 (some years they were F7.8 and some F8.7) had a 4" removeable extension between the focuser and the OTA. That is fine if all you do is bino-viewing, otherwise you need to add 4" of extension to get back to mono viewing, give or take a little on the length.įor your issue unless you can get a replacement tube that is the correct length for BV you usually can't fix it with a focuser only as most out there that are replacement focusers are designed to be the same drawtube range as the original one. I know of some people on the AP refractor list who ordered their scopes with shorter tubes. Then they got the idea of shortening it a little bit and putting in a focuser with a long focus tube that was barely BV compatible just so mono viewing still worked.
I have had a couple of those (and still have one). Most people forget that early BV ready refractors were normal ones with shorter tubes where the cutoff length was replaced by an extension to the focuser that you could remove to make the scope the perfect length to use the BV.
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