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Astronomical darkness returns to 55° North on Tuesday so it’s time to get my finger out and finish a few summer upgrades. The first and the most major is moving from the 77ED to the 101EDII. It is compatible with the same components as the 77ED, so all you have to do to upgrade it is to change the front objective.

It has a focal length of 530mm compared to the 77ED’s 430mm so gives a slightly tighter FOV, and is also slightly faster with the 0.85x reducer giving it F5.3 compared to F5.6. I’ve still to run some flat frame tests but still being under F5 I’m hoping 1.25″ filters will still just about do the job.

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