3 element - 0.75x-Flat Field for sharper stars all to way to the edge. Specifically made for the 106mm APO. Screws on to the M63x1-Thread. 0.75x factor - reduces the focal length to 525mm while giving f/4.95. 55 mm to 60 mm back distance - fine tune in 0.05 mm Increments - from the M48x0.75-thread.
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
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