UFC Telescope-Adapter S70a to SP54a – Optical height: 1 mm

The Special thread 54 has another pitch than the common metric M54 threads. The pitch is 0.7 mm - an approximation of a US standard of old "step-down rings" - which were quite common. So the UFC S70 / SP54 (m) adapter would not fit your desired thread size and pitch of M54x0.75 mm. Unfortunately, we do not currently have a UFC S70 to M54 with male thread size in our product range. The Baader UFC M54x0.75 (m) Camera Adapter would fit your desired M54 thread size, but only in combination with our UFC Filter Base.

The #2459134 adapter is not the issue, as the thread pitches of the M54x0.75 thread of the Falcon rotator and the SP54 are similar enough. It might be a different story for the UFC base, that would be attached to this adapter. The UFC base has a diameter of 89mm. Looking at the technical drawing of the rotator, you should have around 50mm clearance from the center of the M54 thread to the motor housing. Where you potentially will run into issues is the additional height of the knob that is attached to the filter slider. This has a height of 10,5mm, reducing the clearance to nearly zero. You could screw out the knob, but that is really an afterthought. Unless you can try out the combination, we cannot say for certain if this will work, sorry.

The Special thread 54 has another pitch than the common metric M54 threads. The pitch is 0.7 mm - an approximation of a US-norm of ancient days "step-down rings"- which was quite common. And even then, M54 is not clearly defined - some manufacturers use pitch 0.75, others use pitch 1 mm in order to make their parts unusable for others - it´s a mess.