Step 5: set the Fluorostar 91's focal length to 21mm. Shop for focal reducers, coma correctors, and field flatteners from your favorite brands Tele Vue, Baader, Antares, . This will be handy if you also are going to install a Electronic Automatic Focus (EAF . Flattener / Reducer; Astronomy Filters. M48 Camera Side Threads Maximum Backfocus GT71 = 64.1mmGT81 = 62.1mmZ81 = 60.2mmZ103 = 57.5mm Adjustment Setting for 55mm Backfocus GT71 = 9.1mmGT81 = 7.1mmZ81 = 5.2mmZ103 = 2.5mm . William Optics - Camera Concepts & Telescope Solutions The Z61 is the most portable telescope ever made by William Optics, a company with a reputation for building beautiful astrophotography refractors.. The back focus is listed below for each style of William Optics telescope or other DSLR you choose to use. Lens I removed the focal reducer and did some lunar observing. Flatteners Reducers - Telescopes Canada William Optics P-F6A-GT81 Focal Reducer / Focal Length - posted in Beginning Deep Sky Imaging: Ive been successfully using this focal reducer with my William Optics GT81 since about 2016, This focal reducer is rated x0.80 and with the Wilialm Optics GT 81 scope FL 478mm Ive therfore always calculated to be an equivalent FL of 382mm (478 x 0.80 . William Optics 0.8x Reducer & Field Flattener 73R for ZenithStar 73 Add To Cart. Features of William Optics 2" APO Apochromatic Field Flattener and 0.8x Focal Reducer for 66mm to 90mm Refractors WE-FLAT-2: This very elegant 2" reducer/field flattener has been designed for optimal results with the 66mm series of telescopes, although it is functional also with other 80 or 90mm refractors. Our Price: $768.00. . Free US Shipping. That means I'm getting a larger field of view and shorter exposures. SKU: U-MAL-FR-WSPACER . William Optics Gran Turismo GT81 IV (NEW Model) - Cyclops Optics $29.00. Add to Cart. Jump to. Additional Information . What I've done is measure the FL back from the primary lens. Focal length: 478 mm: Focal ratio: f/5.9: Image circle: 44 mm with Flat6A-III (97% full frame illumination) . Share. William Optics Flat4 0.8x Reducer Flattener - Cyclops Optics William Optics Flat6AIII 0.8x Reducer & Field Flattener - M63 to 2" . IC 1318, The Butterfly Nebula in SHO narrowband false colors. This 0.72X Focal Reducer and Field Flattener shortens the effective focal length a bit more than the FLAT7A, taking it from the native f/7.8 to f/5.6. The NEW William Optics Zenithstar 81 APO features an air-spaced doublet lens with an Ohara FPL-53 ED glass element in a CNC machined ultra high precision lens cell with fully multi-coated optics for high resolution, high contrast images virtually free of false-colour. $284.00. It will deliver an image circle of >44 with a 36×24 mm sensor. William Optics Flattener/Reducer - Stargazers Lounge This elegantly designed 2" reducer / flattener has been designed to optimise the flat-field imaging performance of William Optics f/6 to f/7.5 refractors. and thread the focal reducer/field flattener on in it's stead. William Optics Adjustable Flat6AIII for FLT91 - David Astro Lens Super high precision "COPPER" T mount for Canon EOS full frame Cameras. +1-800-504-5813 Contact Check Order Status. Flatteners & Barlows | Accessories | Products - William Optics Adjustable reducer flattener Flat73R for Z73 . Features of William Optics 2" APO Apochromatic Field Flattener and 0.8x Focal Reducer for 66mm to 90mm Refractors WE-FLAT-2: This very elegant 2" reducer/field flattener has been designed for optimal results with the 66mm series of telescopes, although it is functional also with other 80 or 90mm refractors.
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