I have the Askar FMA 135 and it is a fantastic addition to my equipment. Problem was, not much available for accessories and the ability to attach them to the scope. I decided to create a few things that I thought would be beneficial. Just in case others are having trouble with the same issue, I figured I would post the designs.

Dovetail Bases

I found some that my design is based on in a post and loved them. Minimal in design and not intrusive to the scope. Unfortunately, the original designer was no longer making them. Here is the link to the website (it is in Japanese but it does translate if you need to) just in case you're interested-

https://stellartech.science/2021/06/24/fma135_base3/

I decided to take a crack at designing it myself. You will need to tap the hole on the side with an M4X0.7 tap for an M4 screw. The hole itself is already sized so that you can tap it without needing to drill it wider first.

Bahtinov Mask

Since the scope has a 1.25" filter thread adapter for attaching filters to the front of the objective, I figured I could use it for a Bahtinov mask. I used an old ND filter cell that has double sided threads so I can still use the small factory cap. To install, remove one of the filter retaining rings and remove the filter, then drop in the mask. Re-install the retaining ring. The Bahtinov mask stays attached to the adapter (a page out of WO book). I included an image showing how the mask works. It is a 10 second exposure with a tri-band filter installed.

EAF Bracket and Ring

These parts were a re-mix from two contributors. Both originals are excellent designs. The bracket was modified by adding my tall dovetail base and removing sections I did not need. I also added some access for screws . The GT2 ring, I reduced the height to 12mm. I also added two pre-threaded M4 screw holes to secure the ring to the telescope focus ring but you may want to run your M4 tap through them again just to clean up the threads.

You will need the following:

      - M4X5mm nylon tipped grub screws      - GT2 272mm to 280mm closed belt 6mm wide

To set things up:

1. Install the GT2 ring gear on the focuser ring of the telescope.

2. Install the bracket and motor with the pinion gear.

3. Align the pinion gear and gear ring so that they are in alignment with each other.

4. Run the motor to about 5000 steps. This should be enough to run the autofocus routine in ASIAir (or whichever control method you are using).

5. Manually focus the telescope (do this with you filter installed as this will affect the focus position).

6. Install the belt and slide the motor up to tension the belt. Do not over tension. All that is needed is to prevent slipping and unwanted backlash. Too much tension could damage the helical focuser over time.

Dew Shield

This was actually the first thing I created for the telescope. I image in a Bortle 7-8 zone and have a streetlight about 50 meteres away from me. This I printed in matte black PLA to help reduce internal reflections. Regular PLA black prints just a bit too shiny. It just slips on over the objective.

Feel free to modify any of the designs to suit your needs or requirements. I am not planning to make any changes to them but if I do, I will upload them here. All hardware is readily available on Amazon.

All parts were printed in PLA plastic (Polymaker) using the standard bed/nozzle temeratures set by the BambuLab slicer.