[Mesu]

Hello astronomers,

I'm the designer/vendor of the Mesu-Mount.
Saw the very interesting discussion about telescope mounts.

I like to explain things about the periodic error graph on the Mesu-Optics website.

The graph is made with a 65kg Takahashi epsilon 300 on one site of the mount and another 65kg on the other side. (a picture of this setup is on the website)
Let it run on a star for 1/2 hour without autoguiding.
The graph is the mount's PE+seeing+flecture+wind+walk by's when operating the mount and maybe more things that I don't know.

A PE graph that shows a fraction of an arc.sec PE can only be made by measuring pulses on an hi resolution encoder on the RA axis. That's what ASA does with his mounts. I talked about that issue when I met at a fair to promote our products. It's another way of measuring a PE and it can be don inside a building without telescopes.

Andrew has right when he writes.
"No measurable periodical error"
yet spend a great deal of time showing how they measured it
But I hope it's clear now why it's on the site in this way.
I measured the PE+all other things.

I think as other members mentioned that When the PE is on arcsec level and you still want to guide better because of the telescope resolution. Then you need feedback from the sky by autoguiding.

The MesuMount/ServoCAT autoguider can autoguide within a fraction of an arc.sec.

Best regards,

Lucas Mesu
www.mesu-optics.nl