39mm drop in filter for 600mm f5.6

Apr 6, 2009
Jacksonville & Melbourne
For now i am hanging onto my 600/5.6 to use for the upcoming shuttle launch. I bought it used and it id not come with a filter in the rear holder. I have read for some of these lenses that the rear filter was part of the optical formula. Ihave been looking for 39mm filters and found a neutral clear. Would that be enought to complete the optical formula?
Feb 13, 2009
Eau Claire, WI
That is a great price!! I think it would work just great. As far as the optical formula....it is true that Nikon intended for a piece of glass to be there. I have yet to find anything that show a IQ loss with it missing.

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