If you want to do long exposures (over 5 minutes) in Alt/Az mode without a wedge, you can correct for field rotation (which results from the scoep not rotating on the same axis that the earth does) with Meade's Field De-Rotator. Attaches to the rear cell of your scope to precisely counter the effects of Alt/Az-induced field rotation.
Available for shipment to the USA and Canada only.
Dimensions & Specifications
Telescope Accessories Series
Meade Field De-Rotater
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1-year limited manufacturer's warranty
Return & Exchange Policy
At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.
Q1: Can the field de-rotater be used with the DSI in an AltAz mount?
A: Yes you could use it with the DSI in an Alt AZ mount though you don't need to.