Thread: Powermate with ext tubes with/without diagonal little focus change??
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Old 31-08-2021, 01:33 AM
Don Pensack's Avatar
Don Pensack
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Don Pensack is offline 		 
Join Date: Aug 2006
Location: Los Angeles
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As you can see from this chart, the magnification changes very little behind the PowerMates with different back focus distances:
https://www.televue.com/engine/TV3b_...id=53&Tab=_app
The 4x PowerMate gets to 4.45x at 100mm away from the lens.
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