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Showing results for tags 'extension tube'.
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Quite a few bits and bobs to shift. All items £2.50 P&P OPEN TO SENSIBLE OFFERS Enjoy! ADM MDS Dovetail plate adapters i.e. Mini dovetail clamps x2 - £15 each, £27.50 for two. PENDING TO BRYAN Telepak1 without vixen clamp, handy gadget for adding a second scope to a counterweight bar, I used it on a Giro mount. - £20 inc P&P SOLD 6x30 Finderscope with o ring but no bracket - £7.50 STILL AVAILABLE 1.25" erecting Prism - £12.50 1 STILL AVAILABLE EOS to C adaptor with CS spacer - £22.50 25mm Super Plossl - £10 Payment via PayPal fees paid or gift, bank transfer also ok.
Hi All, just thought i would show the results of a little project. I have been guiding with my Orion Mini Fifty with great success using a ED80 F7.5 scope to image through. recently though i wanted to get a little closer to some of the objects coming up in the summer sky. M13, M3, M33, M27, Cygnus wall, m101, wizard nebula... etc etc the list goes on. I will be trying with my 2x barlow giving a focal length of 1200. Which should be OK guiding with my mini fifty, but i wanted to try and match the pixel ratio a bit better to see if it helped, BUT i cannot get focus on the mini fifty when i use a 2x barlow on that... i can screw the barlow lens directly to the end of my QHY5ii_L mono but the focus point puts the camera about 1mm out of the back of the tube. TOO CLOSE to use a barlow as an extension tube because of the internal shoulder.... hmm dilemma. Now i am a product designer so to the drawing board i went....well to Sketchup anyway. Money is always tight so an aluminium turned part was out, but a rigid plastic 3d printed part was on the cards. And as luck would have it, my work bought a new SLA 3D printer (Form2) from form labs) capable of printing to 25 micron resolution. I thought Christmas had come early! attached are images of the final part attached to the rear part of the Mini Fifty, ready to be screwed in place. Not sure how i managed it but i got the tolerances right first time....and measuring the rear part with a ruler. fitting diameter to slide over the rear part of the min fifty = 42.25 diameter. fitting for the camera (1.25") = 32.5 diameter. as you may have noticed i will need to add 3 x M3 threaded inserts to the back end of this to clamp the QHY securely in. i can post images after this is done. if anyone wants this model i can provide it. None of the internal/external detail is needed really, but this was to see what the Form2 could do. And i can say ........it is amazing. (for everything but closed cavity printing. clear skies everyone.
Hello, I am looking to buy an extension tube to achieve direct focus through my SW80ED, I guess 2" diameter by 2"/5cm length should do fine, anything you want to get rid of and willing to ship EU? Thanks for looking Giovanni