EF Mount Module to 1.25 inch telescope focuser

by Schorhr, published

EF Mount Module to 1.25 inch telescope focuser by Schorhr Aug 21, 2011
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EDIT 2016: Check out MementoMori's remix @ http://www.thingiverse.com/thing:1732234

Simple modification of this great EF mount. Thank you, AlexEnglish!
I did not believe it at first, but it really does fit tightly.

With this you can take photos through any telescope, as long as you reach focus (No problem with a 102/1300 Maksutov, could not get in far enough on a 76/300 newton-dobson though).

These adapters usually cost €20 ($28) from a telescope shop, and this probably 5% or less, depending on material, support and setting.

The Mak does have a T2 mount, but for using a barlow, this is a quick and inexpensive solution! :-)

Needs fixing in the future:
Spacer, so tightening the tube into the focuser is easier (now the focuser screws are pressing directly against the EF mount disc)

(Sidenote for the DailyEarring project: It'll be back. Sorry for the hiatus. In the mean time, enjoy the printer live-cam at http://up.no-ip.org:8888 untill my site is back up :-) )


UPDATE 2016: Check out http://www.thingiverse.com/thing:1732234

2- Future ideas: Ad a tube at the base of the 1.25" so the telescope does not rest against the camera mount, else tightening the telescope eyepiece screws is tedious.
1- For dailight use (450D on a Skylux 70/700 refractor) I painted the white part on the top disk and inside the small tube with a "Nail Polish Matte" (ebay ~€3) but any other laquer should work. Without the contrast and sharpness suffers greatly.

Attention! Achtung!
When printing on an pp3dp UP, scale to [[[ 0.99 ]]], else it will not fit!
My first print did not, and I was affraid it would damage my EF mount...
Then I printed it successfully with 0.3mm layer and FAST setting (usualy I use fine/0.2mm), and oriented the 1.25" tube upwards...

Needs fixing in the future:
Spacer, so tightening the tube into the focuser is easier (now the focuser screws are pressing directly against the EF mount disc)

Other Ideas:
-turn around for more support material but smoother EF mount).
-Use black ABS or paint black (nailpolish...) to avoid ambient light problems

On a Cupcake you may want to print the thing in two parts and glue it together, but I don't really have a clue. Please share your experiance

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The EF side of this dosn't line up at all. comparing it to a cap these are at least 25% bigger, and line up in the wrong spot to fit the camera.

I used this on a smaller Canon DSLR, EF-S, the full sensor canons have EF. Fits fine on EF-S, even with printer tolerances, the size should not be 25% bigger?

Would prob be a good idea to change the name of this item to EF-S then. Because that turned out to be a wasted print. Thanks for your efforts, just slightly annoying when something isn't labeled right.

Also, this might be good to add to the description:
Compatible cameras:
EOS 7D Mark II
EOS 20Da
EOS 60Da
EOS 100D/Rebel SL1
EOS 300D/Digital Rebel
EOS 350D/Digital Rebel XT
EOS 400D/Digital Rebel XTi
EOS 450D/Rebel XSi
EOS 500D/Rebel T1i
EOS 550D/Rebel T2i
EOS 600D/Rebel T3i
EOS 650D/Rebel T4i
EOS 700D/Rebel T5i
EOS 750D/Rebel T6i
EOS 760D/Rebel T6s
EOS 1000D/Rebel XS
EOS 1100D/Rebel T3
EOS 1200D/Rebel T5

Comments deleted.

No chance to print it with my protos V2. the stl file seems corrupt and under repetier host the mesh is not valid..

Hello Reaching,
sorry for the inconvenience.
The software I'm using has no trouble printing intersecting volumes as long as they are each solid.
Also the STL export plugin of sketchup which I used sometimes "looses" a triangle or two if they are too small.
I just quickly combined the EF model with a tube, if you want you can do that - or:
Netfabb Studio basic, Netfabb cloud or Meshlab as well as other 3D tools should be able to fix it in a few seconds.

Excellent work, this is exactly the kind of thing I hoped to see the EF mount used for. Your photos look great.

In your instructions you mention printing in two parts and gluing. This is what I am doing for my microscope adapter. I have the part that will fit into the eyepiece socket on the microscope, which will nest into the EF mount and will be bonded with acetone. I should have it finished tomorrow,
then I can test and publish.

Also, I'm curious to hear more about the scaling you had to do to the mount. Does that have to do with the printer you're using, something with its settings, or an issue with the model? Mine was printed on a TOM at 100% and while very snug, didn't have to be forced at

Thank you :-) The photo's turned out allright (just shot through the dirty window here :-) )

Looking forward to see your microscope results!

I am in luck, with the UP!+ I can just print it in one part.

Scaling: I think the UP!+ tends to create prints which are a bit thicker; Also if printing holes they sometimes end up beeing ~0.3mm smaller...
But it also depends on the settings (fast/normal/fine, 0.2mm-0.4mm layer thickness).
Usualy it's a bit better on 0.2/fine, but that's just the result of d
ifferent printers I suppose.
No clue if this is just the case with my printer, as I reset the calibration to default.