![]() The rest of the body is equipped with M48 threads on the telescope side and the filter side. On the camera rotator side, there is a M54 thread. The flattener’s backfocus is 56 mm and the adjustment distance for DSLR and mirrorless cameras is 1 mm. Users can also attach a filter wheel to the cameras, and the Adjustable 0.8x reducer will still function like normal. The types of CCD and CMOS cameras that can be used with this tool are as follows: Additionally, it is manufactured with full frame, chip-size DSLR cameras in mind. This particular 0.8x field flattener and reducer is designed specifically for the William Optics Zenithstar 61 refracting OTA. William Optic’s 0.8x Reducer/Field Flattener is a great tool to use when you want to improve image quality by being able to adjust spacing without the need for extension tubes. I am new to all this and just ordered the GT81.William Optics Adjustable 0.8x Reducer/Flattener for Z61 Here is my M31 taken with the GT81, ZWO ASI071MC (an APS-C camera) and the field flattener. It may be useful if a ZS81 owner could post an example. The telescope stays mounted and balanced, meaning less setup time. ![]() My current setup has the HEQ5 on dolly wheels which I use to move it out of the house and then kick out from under the tripod feet. People say you should not move the CEM26 with the telescope mounted on it Re the mount, I could not find a CEM26 in stock, but I did find an HEQ5, and since so many of my YouTube heroes use the HEQ5 I went ahead with that. Either way, if you are taking it on a trip you may want more than the free case that comes with it and leave accessories and camera mounted. ZS81 may (?) require more disassembly to fit in its case. GT81 will fit in its case if you remove the field flattener. GT81 has the rotator which I am finding really useful now that I am doing HaRGB with sessions on different nights and framing and alignment have become more important. ![]() ZS81 has a longer focal length and therefore a bit more magnification - check this out in Stellarium using the camera view ZS81 is a doublet and costs less GT81 is a triplet and costs more - triplet is supposed to be better across the frame than a doublet, since this is my only telescope I can't compare. I'm assuming the focuser is the same and it's night and day after using SLR lenses, not usable once EAF is addedĮAF fits easily on the GT81, I assume this is the same for the ZS81.īoth have mounting points on the barrel where I mounted a red dot finder and my ASIAIR Pro. I considered both the ZS81 and GT81, and had decided on the CEM26 but they were all out of stock or back ordered.īoth have handlebar - fantastic for holding the scope while mounting, as well as mounting UniGuide 32 guide scope or other guide scopeīoth have Bahtinov mask - very handy until you get an EAF ![]()
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