BORG 0.72x Quadruplet Super Reducer
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Up for sale is the Borg 0.72x quad super reducer for Borg 71fl, 72fl, and 90fl, converting the f/5.6 doublet to the fast f/4 astrograph, covering a full frame image circle. Borg part number 7872.
Telescope side has the M57 male thread.
Camera side has the M57 female thread.
Distance to the focal plane is 60mm from the rear flange.
With Borg DSLR adapter 5005, and the camera adapter, e.g. Canon EOS adapter 5005 or Nikon F adapter 5003, it puts your Canon or Nikon camera at the right position.
I initially intended to build a super wide image rig. But never materialized. Hence for the sale.
Condition is very good. Glass is clean. Threads are smooth.
Sale includes the reducer with front and rear cover. No adapters. Sale is CONT US only. Price is 400 dollars net to me, plus shipping.
Telescope side has the M57 male thread.
Camera side has the M57 female thread.
Distance to the focal plane is 60mm from the rear flange.
With Borg DSLR adapter 5005, and the camera adapter, e.g. Canon EOS adapter 5005 or Nikon F adapter 5003, it puts your Canon or Nikon camera at the right position.
I initially intended to build a super wide image rig. But never materialized. Hence for the sale.
Condition is very good. Glass is clean. Threads are smooth.
Sale includes the reducer with front and rear cover. No adapters. Sale is CONT US only. Price is 400 dollars net to me, plus shipping.
