Thanks for the replies.
Because my setup is not permanent, and I am not really looking for the 1 hour exposures, just bundles of 1-10 minute ones, I thought a #1220 would be a good option.
Generally, I take my scope out on my own so a wedge can be an extra burden for me. A de-rotator will be a quick setup, and should give adequate results.
Martin, thanks. I have seen them in the Bintel shop online, which is actually what piqued my curiosity in the first place.
I have *just* missed out on a #1220, just on an off-hand enquiry. I'll keep looking, there must be one out there somewhere.
Failing that, I'll go into Bintel and get a new one. Online price in under $700.
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