0.72x Quad Telecompressor Corrector for 155f7 EDFS

Expand your field! Reduce your f/value, speeding up the collection of photons! And do it with pin-point stars all the way to the corners of your full frame 35 mm sensor! Astro-Physics introduced a new version of the -element telecompressor corrector that Roland designed for the 155mm f7 StarFire. Keep in mind that this telecompressor corrector requires a 3.5" connection to your telescope, so these scopes must be updated to the appropriate focuser or adapter: 155mm F7 StarFire EDF. Has a 4" focuser, so will need our 4" to 3.5" Adapter with Thumbscrews for 4" Focuser (ADA435) 155mm F7 StarFire EDFS. Has a 2.7" focuser, so will need to upgrade to the 3.5" focuser Construction: Four carefully matched glass elements are carefully figured and then coated with the very latest multi-coatings to produce this optical wonder. All mechanical parts, including the covers, are CNC machined and black anodized with a lustrous finish. The male threads are 3.270" x 16 Back focus Spacers and Focuser A