I've been eyeing the William Optics RedCat. But I'm not sure about the price, I'm usually very much a budget lens buyer. Ideally I'd like a tracking mount too. Still frustrating if I can't get the astrotracer to work properly anymore though!
Funnily enough it seems the least effective when the target is closer to the horizon for me!
I shot the region around Antares and the region around Polis (both ~17° last night). The first three 40s shots with the Takumar 150/4 are perfectly tracked. Swapped lens and out of the next 106 shots at30s I have 2 (!!) that are really tracked properly. about 20 are usable-ish and the rest is really only fit for the bin I fear.
The streaks I'm getting are horizontal, so it seems like the sensor simply is moving in the wrong directly. Interestingly enough the good/best shots always are the first ones after realigning the camera every so slightly.
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Note: I'll feel extremely stupid if it's tripod creep!!}
Out of the 1 shots I took of Lyra I've got 10 usable ones, and that's at 60° and a perfectly tracked 60s exposure of.. erm.. somewhere near Ophiuchus (35°)
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Jogged my brain a little, will try and get hold of a different tripod for this evening!}
Will report back, cheers