MGF1 Epsilon focusers are designed to be SECONDARY focusers, and do not require drawtubes, but do require a docking adapter. They do not include built-in drawtube capability and have standard 2" ID moving tubes that accept your 2" format barrel nose eyepieces and accessories.
MGF2 Omicron focuers are designed to be PRIMARY focusers . They require optional moving tubes, with a 2.25" inside diameter, that do not accept your standard 2" format eyepieces and accessories, and require the use of our optional 2" format drawtubes, offered separately at the DRAWTUBES link. This functional design offers near-zero profile, full drawtube insertion into the Omicron's moving tube. This unique drawtube option provides your Omicron with more back focus range (up to 12" with custom drawtube) than any other commercial focuser available today, while also providing a selective choice of back focus travel, depending on which drawtube you choose. Drawtubes, Docking Rings & Spinners sold separately.
MGFC??s are designed to be 2.7" COUPLING in-line focusers mainly for hi-end APO refractors, and need no other drawtube, docking adapter or accessory to operate. Depending on which model you choose, your co-focuser will have built-in male and female threads for an AstroPhysics, Takahashi or Meade refractor. They are not interchangeable between the three scope thread formats and are dedicated to the scope format you choose. They have an oversize 2.25" clear aperture, so the largest CCD chips will not be vignetted by passage of your scope's light cone through the co-focuser to get to your CCD camera.
Most important, MicroGlide focuser's add autofocus capability to your scope without fussing around with "Mickey Mouse" modifications to your existing scope's focuser via aftermarket universal mounting kits that really don't [properly] fit any scope. The major disadvantage to these aftermarket installations is the ratio of the stepper motor to the focuser's moving tube travel. One step in one direction and the image is too soft, in the other, it's still too soft, because the ratio is too coarse to obtain razor-sharp focus. This is a subtle, but very important factor that few people consider when installing aftermarket autofocus - is the ratio fine enough for my scope and camera? VSI's MicroGlide focuser offer a ratio of 0.0000069" per step. That's a factor of ten finer than our MacroGlide and MasterGlide focusers, and these focusers still offer the finest autofocus on the market, by a large margin.
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