Starizona EvoFF V2 - Field Flattener For SkyWatcher EvoGuide 50ED - EVOFF-V2

This field flattener has a very generous 109mm of back focus. Field flattener for refractors; suitable for telescopes from f4 to f8; M48 thread for complete aperture illumination at 2; room for accessories between... Field flattener for refractors, suitable for telescopes from f4 to f8., M48 thread for complete aperture illumination at 2, room for accessories between - 109mm of back focus. Explore Scientific 2 Field Flattener for Explore Scientific ED APO... Review Discount Astromania 2 ED 2X Dual Power Telescope Barlow Lens This means that you need a spacing of 109mm between the lens plane and the camera chip. This is an advantage, as it means you can use other accessories in between - such as a filter wheel, a flip-mirror or an off-axis guider. Of course you could always crop your images to remove the blurred outer region; but using a field flattener it is much more elegant solution for using your expensive camera with its large format chip. Also, the focal length remains the same when using the flattener. A T2 thread plus M42 would limit the incoming light beam and so not provide sufficient aperture illumination for telescopes with 2 focusers. Field curvature is a common optical defect that is not noticeable with visual observing or photography using small chips. Many refractors and reflector telescopes suffer from field curvature. Excellent multi-coating on lenses. Field Flattener For Telescopes Starizona EvoFF V2 - Field Flattener For SkyWatcher EvoGuide 50ED - EVOFF-V2 Telescope Field Flattener If, however, you use a large chip or a full-frame camera, then this defect becomes glaringly obvious. But now the new Astromania field flattener will conjure astronomy photos with pin-sharp stars right out to the outer edge of the image field.