300 f2.8 foot plate

Is there a 6 inch plate or something similar that can be attached to the collar footplate of a 300 f2.8 that has two screw holes to make the fitting more secure when attached to the tripod head . The weight of the lens + 2xtc and a 1D makes for an insecure fit held by one single screw and I need enough fore/aft adjustability for proper balance on a gimbal head.

Thanks

You would think that Really Right Stuff makes a replacement.....
http://reallyrightstuf​f.com …code=LensFoot-All&key=cat

I use the LCF-53 on a couple of lenses... Once you use one, you'll never go back to a plate bolted onto the canon foot....

I've never used my 300 2.8 on a tripod... I'd assume if you get a longer foot than is standard, then you should be OK. If necessary, have a machine shop drill and tap a hole in it for you if you think 2 bolts are necessary. Shouldn't cost much...

Mark H

There are quite a few after market feet available for the superteles.
I never had a problem with the 1/4 - 20 hole in the foot and had a quick release mounted to the foot.

I use a RRS plate on the 300 IS Mk. I and Arca-Swiss clamps on my monopod or tripod for adjustability. If you want the second screw hole for additional (2-point) security rather than adjustability, I'd suggest going, instead, the QR plate (with LocTite) and clamp route. That way you won't sacrifice adjustability (for balance) for solidity. I wouldn't try tapping a second hole into the 300's foot as that might weaken it (and positioning could be touchy).

Wimberley also makes the model P-40 "Arca-Swiss" type lens plate that has three "spacing" adjustable screws (you can remove one if you only want two) and safety end pin screws too and it's almost 6" (5.9" to be exact). I have one I don't use anymore (I sold all my "big" lenses). PM me if you're interested.

Here's the Adorama info on the one I have: Wimberley P40 Arca-Type Plate for Telephoto Lenses

I use one of these on my Canon 300 F2.8 IS Mk1:

http://www.ebay.co.uk …ain_3&hash=item​3cd27a8176
I would recommend the longer version with a 1 series though:
http://www.ebay.co.uk …ain_3&hash=item​3cd6e5be56
They do an even longer one if you feel the need!

The flange at the back of the plate butts up against the foot and prevents any rotation - it is a copy of the Kirk one.