I am wondering if anyone has any experience with this combination and how much backfocus/extension I would need. Thanks.
Powermate 4x + Skywatcher F4 Coma corrector
I might be wrong but isn't coma at the edge of the FOV for a Newtonian, which isn't visible when using a Barlow lens. So, wouldn't that mean coma wouldn't be seen with a Barlow lens, especially a 4× Barlow, this making a coma corrector redundant?
I might be wrong but isn't coma at the edge of the FOV for a Newtonian, which isn't visible when using a Barlow lens. So, wouldn't that mean coma wouldn't be seen with a Barlow lens, especially a 4× Barlow, this making a coma corrector redundant?
To be honest I dont know. I assumed this myself and seeing I'll be using a 9mm sensor it might be null but I do know f4 scopes exhibit coma much much worse than just the edges.
I would not use a coma corrector when using a barlow or a PowerMate. Due to the very, very small FoV you will not see any coma on the sensor.
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