I have an opportunity to pick up a used ASA DDM60 Std built around 2013 that has been firmware updated. Aside from it being a direct drive mount that ASA no longer makes, I'm wondering if it'll be considered as an upgrade from my 6 year old Vixen AXD. My intended payload will be my Takahashi µ250CRS used for imaging with my ASI6200MM camera - a combination that's 0.31"/px at Bin1x1. My payload is < 20kg which is well within the reach of my AXD's 30kg payload, and the DDM60's 25kg payload.
Currently with the AXD I'm guiding a wide range from 0.23 -> 0.7" RMS depending on environmental conditions, and I do have some slight teething issues with the Vixen's ASCOM driver not fully supporting AsyncSlewing (more precisely the Slewing property isn't accurate) which the maker hasn't acknowledged it as a fault yet. What I am hoping to gain from the ASA DDM60 is from it's encoders and from it's lighter weight to save my ageing spine.
However all I have are just the specs of the DDM60 and am not certain if in practice if it'll be a marked improvement over my Vixen AXD from a guiding perspective. I mean if my AXD is able to provide a more consistent 0.2-0.35" RMS, in guiding, I'd probably wouldn't be so anxious in looking for an alternate mount. A such I'm wondering if the DDM60 with it's encoders will provide that.
Anyone care to share their thoughts/opinions?
I've attached 2x PHD2 files, one where I do have good guiding the whole night, and another is just average. Scope/payload setups the same for both instances.
PHD2.zip 266.94KB 5 downloads