A compression ring makes sure you don't mar your autoguider or eyepiece.Īlignment Rings and Versatile Dovetail Mounting Options Or if your autoguider has a fixed 1.25" nosepiece, you can insert it directly and lock it into the focuser's accessory holder. The focuser is machined with male T-threads to securely attach an autoguider that has a removable nosepiece and female T-threads. That means your autoguider only moves in and out during fine focusing and does not rotate, so the camera orientation and field of view of the guide stars remains fixed. The helical focuser also incorporates a fixed-orientation design. The total focus travel range is thus 42mm. The design of the precision helical focuser eliminates any play in the drawtube over its entire travel range. A thumbscrew is also provided to lock down the helical drawtube where desired. The fine focuser has a knurled focusing collar and a 0-10 scale on the drawtube with 0.05mm increments. Precise, fine-focus adjustment comes from a newly-engineered helical focusing mechanism with 10mm of travel. Once set, the drawtube locks in position with a thumbscrew. The focuser includes a drawtube with a total travel of 32mm for coarse focusing. It works best for imaging with refractor or reflector telescopes with focal length up to 1500mm. With an overall length of 8.1" (205mm) to 10.5" (267mm), and a weight of 1lb-6.2oz, this f/3.8 refractor with a focal length of 190mm won't take up much space or weigh down your mount. Ideal for autoguiding long-exposures with DSLR or CCD cameras, this moderate-aperture 50mm guidescope gives bright images and puts within reach many guide stars not accessible with smaller-aperture scopes.
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