Atik Cameras

Author Topic: Backfocus Questions  (Read 6344 times)

joelshort

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Backfocus Questions
« on: April 04, 2012, 07:30:01 pm »
I have the Atik OAG/EFW2/383L+ kit.  Can anyone tell me EXACTLY what the backfocus of this complete kit is? 

If memory serves the published backfocus is:
OAG=24mm
EFW2=22mm
383L=17mm

That adds up to 63mm.  However, when I calculate the actual backfocus by using accurate image scale etc, I get a figure of 58mm.  5mm doesn't sound like much but it can greatly affect the correct use of flatteners/reducers, so I'm trying to figure out the exact backfocus of this kit.