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Teleconverters RF vs EF

Started 1 month ago | Discussions thread
OP Shawn1519 Forum Member • Posts: 68
Re: Teleconverters RF vs EF

Thanks everyone for responding.  After thinking about this some more, examining how tele's work on DSLRs and EF lenses.  For example the EF 600 F4 lens the focal plane of the lens is the rear of the lens plus the distance from the lens to the sensor - put a tele in the mix, and the front element of the tele is much closer to the rear element of the lens than what the above described focal plane - thus the optical design of the tele must accomodate this.  The RF and EF tele's are obviously completely different optical designs, and the RF tele's are designed to accomodate the difference in focal plane distance between RF and EF lenses.

But one strange anomaly still exists (and this was pointed out by one person in this thread).  By design, a RF tele won't fit on a EF2RF adapter.  But yet the RF 600F4 and RF 400F2.8 lenses violate this design by allowing a RF tele to fit on the back of the (built in) EF2RF adapters on those 2 lenses.  This tells us that Canon modified the EF2RF adapter that they welded onto the RF 600F4 and RF 400F2.8 lenses.

Shawn

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