Brand new CHL 2.5" dual speed crayford focuser by Moonlite designed specifically for the Celestron EdgeHD tubes. You can fit the 0.7x focal reducer inside the focusers drawtube for ultimate versatility.
We offer everything from our heavy duty tri-knob reduction unit with shaft lock system to different types of motor options for both visual or imaging configurations. Our "High Res" stepper motor options use PC based interfaces, providing automated focus ability running todays ASCOM software. The new C-axis bearing collimation system provide flexibility for achieving perfect mechanical centerline collimation should the need arise. Custom anodized colors and 68mm thread top options make for a perfect custom focuser to match your EDGE scope.
The new CHL 2.5” large format focuser features a low profile hybrid design to allow focal reducers to be used inside the focuser. We make 3 versions: one for EDGE 8” using the .7” EDGE reducer; one for EDGE 9.25” using the Lepus Telecompressor #19410; and for the EDGE 11” / 14” using the large EDGE .7 reducer or the Lepus Telecompressor. The focuser will also work with out the reducer installed.
CHL focusers for EDGE 8" and 9.25" scopes include a special short profile replacement knob kit. The machined aluminum knobs replace the stock plastic mirror lock and focus knobs. The knob design along with a tapered bottom focuser flange shape allows the CHL 2.5” large format focusers to thread on to the visual back in a very low position. This super low profile along with the reducers fitting up in the large format focuser’s drawtube provide much needed back focus for imaging set ups. We also include a special 68mm to Recessed T-thread adapter along with the normal 2” and 1 ¼” comp ring thread in tops. All 3 thread in tops come standard with any of these CHL model focusers.
CHL focuser for EDGE 8inch scope includes:
Replacement aluminum machined knob kit
Clear adapter tube ( for when the .7 reducer is not being used )
Special 68mm to- recessed T-thread with lock ring adapter
Note 68mm recessed T-thread adapter installed in drawtube. This adapter is included free with all CHL focusers. It allows the focuser and camera to rack down even with the top of the focusers body. Both a 2" comp ring and 1 1/4" thread in tops are also included as well.
MoonLite CHL focuser configuration and specs for EDGE 8” scope
Body = 1.85” thin style with new C-axis bearing collimation system
Bottom flange = Special EDGE 8” Focal reducer flange with 2” SCT thread system and clear tube adapter
Upper flange = .55” standard thickness
Drawtube = .55” travel 68mm thread top style
Knob/Motor = All options are available.
Distance from reducer edge to top of the recessed T-thread adapter is 35mm. That leaves 70mm of space for imaging sensors. (Based on .7 reducers 105mm required distance specs ).
All focusers are pre collimated on a spin fixture on a bench before we ship them. We project a laser in the focusers drawtube at a target located 8 feet away and adjust the drawtube tip/ tilt so the laser dot spins on its self when the focuser is rotated. Edge customers can now collimate the focuser to adjust for any error in the visual back/ center line of the imaging plane. The ability to adjust the focuser’s collimation can be very useful when setting up an EDGE scope for imaging.
Lifting Capacity: The drawtube pressure can be adjusted to each user’s preference. Increasing the pressure increases the load capacity (vertical lifting capacity) of the focuser. Decreasing the pressure lowers the load capacity but gives the focuser a smoother focusing action. We set the focuser at approximately 6 lbs. at time of assembly; however, you can adjust it to be less or more depending on your specific needs. The ideal setting is to have it adjusted so the focuser can hold the heaviest load presented without slipping and requiring no additional force. This will give the focuser the best feel and still provide the vertical lifting capacity required. To adjust - turn the aluminum thumbscrew located between the two setscrews on the bottom of the focuser CW to increase load capacity. The aluminum thumbscrew can only add pressure, not take away pressure. This is due to the 2 setscrews on each side of the thumbscrew applying a minimum set pressure amount. In some rare cases, it may be necessary to do a coarse adjustment by turning the 2 setscrews located on each side of the aluminum thumbscrew (1/8 allen wrench) a very small amount. Normally, 1/20 of a turn or less should be made on the setscrews in a CW direction, then check the lifting capacity pressure by racking the drawtube up and down.
Collimation: To adjust collimation, turn one of the 4 mini setscrews located between the bearing sets on the body of the focuser. This will tilt the drawtube in one of 4 directions. See advanced laser collimation document for more information about collimating an SCT. The focuser is already collimated before we ship it, so any adjustment made will take it off the factory settings.