8" helicoid focuser for 8" Newton with 2" filter slider by pelzfuss

Last crawled date: 3 years ago

The helecoid focuser fits on all 8" Newtons with 203 mm steeltubes (without changing the lenght of the tube!)
You need:
1x Pixco M65-M65 helicoid
1x 2" eyepice Tube (50mm long) (please adjust the hole in the eyepice tube adapter yourself. Make half a mm wider as necessary!)
1x 9,5mm ball catcher
and some 52mm to 48mm step down rings for the filter slider
8x 3mmx25mm screws
a bit two-component adhesive to fix the single parts
Print all parts with 2mm thick walls to make it stiff enough!!
Pic 1: 65mm-65mm helicoid
Pic 2: 2" eyepice tube, 9,5mm ball catcher, 52mm-48mm step down ring
Pic 3: I designed the base in 3 parts, so there's no support needed.
Pic 4: The eyepice tube is glued into the PETG Adapter // The PETG Adapter is glued into the Helecoid (just three little drops of glue between the screws of the helicoid)
Pic 5: make the original focuser screws fit the base and fix it on the tube
Pic 6: fix the filtercase with 4x 3mmx25mm schrews onto the base // fit in the ball catcher
Pic 7: squeese the helicoid carefully into the top plate. (be aware, that the helicoid is screwed completely together)
Pic 8: turn it around and give some glue to edges
Pic 9: glue the step down ring into the slider
Pic 10: The design allows you even thick filters (here my castel UHC, wich is 9mm high)
Pic 11: although the china helicoids have a certain thread play, I gave it a go on my 8"f5 foto newton. focusing is really fun and my eos600da was held really secure.
Pic 12: M81/M82: 19x 6Min; ISO 800; IDAS LPS2; EQ6; guiding PHD2