New lightweight rod support bracket

[Billy Mead]

*subscribing*

 

[Douglas Underdahl]

Yes, you should be able to put handgrips on the rods.

 

[Shawn R]

Velcro is amazing stuff.

 

[Larry McKee]

Any word on the approval process?

 

[Douglas Underdahl]

Not yet! Should have finished units in less than 2 weeks.

 

[Larry McKee]

Cool. Thanks.

 

[Denis Buhot]

Well done... do you feel like giving us maximum weight supported with such a system ? I'd appreciate that.. I doubt it (or the front part of the red..) could stand, say, a Nikon 800 mm... a shame, though...

 

[Douglas Underdahl]

I'll probably do a destructive test - hang weights from it until the rods bend severely or the screws tear out (not of the camera - a surrogate aluminum plate!!). Any bets on how much weight, hung 4" down the rods, the unit will take until failure? I say 100 pounds.

 

[Pawel Achtel]

I'll probably do a destructive test - hang weights from it until the rods bend severely or the screws tear out (not of the camera - a surrogate aluminum plate!!). Any bets on how much weight, hung 4" down the rods, the unit will take until failure? I say 100 pounds.

Douglas,

Having masters degree in structural engineering I wanted to suggest that we (engineers) usually calculate these things without expensive damage. How about you give me tensile strength or type of the alloy you used, dimensions and I will calculate the strength before failure for you? I can also calculate safe load rating for your peace of mind.

Of course, as a part of the deal, I will gladly accept the mount(s) that I saved from the inevitable destruction and brutal annihilation :innocent:

 

[Douglas Underdahl]

I have an engineer that I consult regularly, but here, it would be more fun and more accurate to destroy one.

 

[Steve Sherrick]

Can you film some of these tests Doug for our viewing pleasure?

 

[Mitch Gross]

The issue should not be destruction point as this is likely by far quite excessive. More likely than destructive overload weight is shearing force -- imagine an overeager AC dashing through a doorway and slamming the rods sideways into the doorframe. Trust me I've seen it. The shearing force of either the screws or the metal into which they are threaded will be the likely failure point here.

But what you should really care about is deflection weight. How much weight can be put upon the rods at a given distance (say six inches) before they deflect (bend downward) by a given measure, which should be enough to take a lens out of planarity with the image sensor by straining the mount. I would put this at a fairly low percentage of deflection angle, perhaps a degree or two.

This is why Aatons use steel rods instead of aluminum for their similar rod design to this. Not saying that these rods won't handle the weight just fine, but this is in fact the critical test.

 

[Jason Osterday]

Any chance this will be released in the next two weeks?

 

[Pawel Achtel]

I have an engineer that I consult regularly, but here, it would be more fun and more accurate to destroy one.

Can't argue with that

 

[Poi Boy]

Looks like a great option for my light setup, Thanks Douglas.
Aloha
-A

 

[Denis Buhot]

deflection... yes

deflection... yes

.

But what you should really care about is deflection weight. How much weight can be put upon the rods at a given distance (say six inches) before they deflect (bend downward) by a given measure, which should be enough to take a lens out of planarity with the image sensor by straining the mount. I would put this at a fairly low percentage of deflection angle, perhaps a degree or two.

.

especially when the weight of a big telephoto lens will be mostly hanging off balance.. One degree or two.. looks quite much to me...I'm truly interested !!!

 

[Pawel Achtel]

I would put this at a fairly low percentage of deflection angle, perhaps a degree or two.

hehehe Mitch, one or two degerees is an entire angle of view of some lenses. Trust me, you would not want to bend a lens 1-2 degrees, even if it was a rental :w00t:

 

[Mitch Gross]

If you guys think a degree of deflection is way too much then best you stick with 19mm steel rods. Trust me, I know what happens in the real world.

 

[Denis Buhot]

no offence..

no offence..

If you guys think a degree of deflection is way too much then best you stick with 19mm steel rods. Trust me, I know what happens in the real world.

meant, Mitch.. Just wondered.. I'm truly interested, really and pretty confident you know what the real world is.. Just keep on filling us in, you might come up with a winner here...

 

[Nick Gardner]

I think the real benifit of this system is not lens support (15mm aluminum 60mm spaced rods won't support a 20-100), but hand held and jib/steadicam with primes. It would be very nice to fly a prime, an mb-19, and a couple of motors on these rods.

Cheers,
Nick