Push-pull zoom resistance 100-300 5.6 L

Primes:
Bower 14mm 2.8, Takumar 28.mm 3.5, Bower 35mm 1.4, Takumar 50mm 1.4, Canon 50mm 1.8, mamiya 55mm 1.8, Samyang 85mm 1.4, Meyer-optik 135 2.8, Mamiya 135mm 2.8, Takumar 135mm 3.5, Mamiya 400mm 6.3
Zooms:
Canon 28-105mm 3.5-4.5, Canon 100-300mm 5.6L.

Kelly - EOS 5D - EOS 40D - Rebel XS - EOS 10D - EOS 1D - SX230 - AE-1 - OM-1n - Minolta Himatic7 - EOS-1N
ABR800 - Several flashes, remote triggers, stands, too many and yet not enough lenses

Fred - Photographing everyday Military life in Iraq | SmugMug
7D | C 100-400L | Σ 70-200 2.8 OS | Σ 30 1.4 | C 10-22 | Σ 8-16 | C 17-55 2.8 IS | C 28-135 IS | 580EX II | Σ 1.4x

BaghdadFred wrote in post #14649439
I Have no idea what the Canon 100-300 5.6 L is.. I'm guessing you mean the 100-400L 4.5-5.6?

Haven't you tried tighten/loosen the locking ring?

Totally different lens.

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Fred - Photographing everyday Military life in Iraq | SmugMug
7D | C 100-400L | Σ 70-200 2.8 OS | Σ 30 1.4 | C 10-22 | Σ 8-16 | C 17-55 2.8 IS | C 28-135 IS | 580EX II | Σ 1.4x

100-300L 5.6 .. it's a great ole "L" lens. I love it for the price. (<$325 for mint copy).
That said, no practical way to adjust tension - other than maybe a "lens band".

http://www.photoethnog​raphy.com …05/equipment-canon-1.html

Gear List

ettsn wrote in post #14649374
Yeah, I've got it's little brother the 70-210 f/4 and it slides like ball bearings on bacon grease. Nothing you can do, unfortunately. Still, a cool old lens!

No ball bearing, nor bacon, but it cannot maintain full extension when sitting straight up. What resistance is "normal"?

Primes:
Bower 14mm 2.8, Takumar 28.mm 3.5, Bower 35mm 1.4, Takumar 50mm 1.4, Canon 50mm 1.8, mamiya 55mm 1.8, Samyang 85mm 1.4, Meyer-optik 135 2.8, Mamiya 135mm 2.8, Takumar 135mm 3.5, Mamiya 400mm 6.3
Zooms:
Canon 28-105mm 3.5-4.5, Canon 100-300mm 5.6L.

wallace1837 wrote in post #14650735
No ball bearing, nor bacon, but it cannot maintain full extension when sitting straight up. What resistance is "normal"?

It should be a little better than that, but unfortunately there's not much to be done without tearing the whole lens apart.

Stretch a lens band or thick produce (like broccoli) rubber band around the inner barrel when you're at full extension and it should keep the head from sliding back down on its own.

Kelly - EOS 5D - EOS 40D - Rebel XS - EOS 10D - EOS 1D - SX230 - AE-1 - OM-1n - Minolta Himatic7 - EOS-1N
ABR800 - Several flashes, remote triggers, stands, too many and yet not enough lenses