Re: Quick Release Clamp: Lever Release or Screw Knob Release?
dwswager wrote: Rob Tomlin wrote:
The question is which version of the BH-40 to go with? I haven\'t used either kind, so I don\'t know what I would prefer in terms of a Lever Release vs the Screw Knob release.
Any advantages or disadvantages to one over the other?
RRS states that 80% of the clamps they sell now are lever release.
I have an old one on my Arca Swiss B1 with a knob I can actually disengage so I don\'t accidentally open the clamp and dump the gear.
The lever is nice in that there is a half way point that will release pressure and allow you to re-position the gear in the clamp without fully disengaging the clamp from the dovetail. That is what the stops are for on plates so they don\'t shoot through the clamp. I would call or email RRS if you have non RRS plates (Kirk, Arca, Sunwayfoto, etc) to verify the lever would work with what you have or plan to get.
The knob is nice because you can definitely apply more clamping pressure than the lever does and you can usually accommodate most any Arca Swiss plate because you can close the clamp further than the lever does. However, newer lever clamps, at least the panning clamp, says they have made it so it will accommodate most plates.
I plan to purchase the panning clamp soon and will most likely go with the knob just for my piece of mind. I have a Kirk macro focusing rail that I use for that purpose and as a half assed nodal slider. I can just imagine me doing something stupid and accidentally bumping open a lever clamp!
actually a lever clamp can apply more clamping pressure then a rotating knob. the average clamping load from a lever is approx 50lbs of force. it has mechanical advantage provided by the lever and cam assy. the only way you can do that with the knob is by using a vise grip on it and use it as a lever.
as to accidently bumping open a lever lock clamp i can safely say you\'d have a pretty good challenge on you hands in the RRS clamp case due to its design.
i\'ve been using the lever lock clamp since it arrived years ago. in most cases it is smarter and safer to to use because you know what state its in per the levers very obvious position
Re: Quick Release Clamp: Lever Release or Screw Knob Release?
dwswager wrote: Rob Tomlin wrote:
The question is which version of the BH-40 to go with? I haven\'t used either kind, so I don\'t know what I would prefer in terms of a Lever Release vs the Screw Knob release.
Any advantages or disadvantages to one over the other?
RRS states that 80% of the clamps they sell now are lever release.
I have an old one on my Arca Swiss B1 with a knob I can actually disengage so I don\'t accidentally open the clamp and dump the gear.
The lever is nice in that there is a half way point that will release pressure and allow you to re-position the gear in the clamp without fully disengaging the clamp from the dovetail. That is what the stops are for on plates so they don\'t shoot through the clamp. I would call or email RRS if you have non RRS plates (Kirk, Arca, Sunwayfoto, etc) to verify the lever would work with what you have or plan to get.
The knob is nice because you can definitely apply more clamping pressure than the lever does and you can usually accommodate most any Arca Swiss plate because you can close the clamp further than the lever does. However, newer lever clamps, at least the panning clamp, says they have made it so it will accommodate most plates.
I plan to purchase the panning clamp soon and will most likely go with the knob just for my piece of mind. I have a Kirk macro focusing rail that I use for that purpose and as a half assed nodal slider. I can just imagine me doing something stupid and accidentally bumping open a lever clamp!
actually a lever clamp can apply more clamping pressure then a rotating knob. the average clamping load from a lever is approx 50lbs of force. it has mechanical advantage. the only way you can do that with the knob is by using a vise grip on it and use it as a lever.
as to accidently bumping open a lever lock clamp i can safely say you\'d have a pretty good challenge on you hands in the RRS clamp case due to its design.
i\'ve been using the lever lock clamp since it arrived years ago. in most cases it is smarter and safer to to use because you know what state its in per the levers very obvious position
Sep 09, 2014 at 04:26 PM
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