Extreme Riser - read this if you have Cavision parts...

taormina said:
Good points, Ryan and Erik. Possibly a double riser system would be ideal, but hear me out a moment.

I was a structural steel draftsman in another career and I spent alot of time designing steel platforms and structures for oilfield equipment. I know a bit about design.
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Well I do not - as I have never been a draftsman. Thanks for the information- very enlightening. What do you think about the connection point? Will that break / give out? I would think that the majority of the weight is now resting on the screws in the Z- is this in danger of failing with all of that wieght on there?


taormina said:
Ryan - You were right, my apologies. The FE worked fine without any modification - the LEX was simply too deep.
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No problem at all- I just chuckeled to my self when I saw your post. :) I didn't even think about there being a difference in height between the Extreme and the FE. I was completely baffled how you were able to get your ND Grads to work with the setup you had...

taormina said:
You would also need to go to 24" rails to add the aft most bracket. Look at my pics: mine are 18" and do not extend to the back of the camera.

I like Erik's solution, and would probably be a candidate for it, but you would need to pop for 24" rails.
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That is the solution I am already implementing- you can see the pictures of my rig else where on DVXuser. You can get away 18" rails with lenses that are a shorter (under 100mm) focal legnth, or if you have a clip on matte box.

You will need 24" when you want to use something like a 135mm lens. However, even at that lenght the 24" rods are still over kill. What would be perfect would be 19" or 20" rods. The 18" are too short, and the 24" are too long- somewhere in-between is the sweet spot. :)
 
Guys,

We are going to make a longer riser available, I think we can come up with a temporary solution for now before we manufacture a longer adjustable riser.

Adam,

How much longer was the riser you made than our piece was?

jason@cavision.com
 
I'm going home to measure exactly. It's not only the difference between the LEX and the FE, it is also that at maximum extension, your riser does not touch the bottom of the plate. It is only held up by screw pressure. Mine touches the bottom of the camera AND the bottom of the base plate. So that is where the extra length comes from. be back to you soon.

A
 
taormina said:
Mine touches the bottom of the camera AND the bottom of the base plate.
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That makes a big difference in how sturdy it is- and why I had originally opted to lower my matte box. Raising it up and relying on the screw pressure makes it kind of awkward / uneven. Good move on making the riser touch the bottom of the plate.
 
Riser will solve my two problems: bracket in Extreme's way and being able to attach mattebox/follow focus.





Regards

p.s. comments on the photos make sense in their original thread...
 
The riser is 75mm tall, to all that wanted to know. Remember - this is 75mm from the top of the cavision baseplate to the underside of the camera. It is the absolute minimum height that you need to make the matte box work. At this height, you even need to turn the matte box rail mount upside down to gain more clearance. The riser is no taller than it needs to be. If you can build one without slotted holes you're better off as well. Nothing to wiggle. Also, make sure the base plate touches the bottom on the lower plate for stability.
 
JConnors said:
Guys,

We are going to make a longer riser available, I think we can come up with a temporary solution for now before we manufacture a longer adjustable riser.

Adam,

How much longer was the riser you made than our piece was?

jason@cavision.com
Click to expand...
All,

Since Jason is working on the riser, I guess I shouldn't double work it. I have too many things to focus on right now.

Thanks Jason.

Hien
 
The riser is 75mm tall, to all that wanted to know. Remember - this is 75mm from the top of the cavision baseplate to the underside of the camera. It is the absolute minimum height that you need to make the matte box work. At this height, you even need to turn the matte box rail mount upside down to gain more clearance. The riser is no taller than it needs to be. If you can build one without slotted holes you're better off as well. Nothing to wiggle. Also, make sure the base plate touches the bottom on the lower plate for stability.
Click to expand...

Adam,

Thanks, appreciate that. I'll forward this along.

From what I measured, from the top of the camera plate (RPMD-90) to the bottom of the rear bracket (R15B80) (this is when the riser is adjusted to its highest position) is just under 60mm (59mm), so we need to clear about 16 more mm. 75mm is the minumum you require right?

Also, make sure the base plate touches the bottom on the lower plate for stability.
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Do mean you'd like to have the riser flush at the bottom of the slot in the R15B80.

J
 
Sounds about right to me, about 5/8" too short. 75mm is the absolute min I was able to achieve with all Cavision equipment.

Exactly, the riser should be flush at the bottom of the slot in the R15B80. The cavision unit at maximum rise does not touch the bottom of the slot and relies on screw tension for strength.
 
Also, keep in mind, I as well as others have different matte boxes than Adam has. He has the Cavision, I have the Cinevate, I don't know how the matte box mounts differ or if they do.

I am waiting to get my HVX back from service this week or early next week, then I can take measurements.

Thanks for being on this guys, we are all in the same boat, new LEX, HVXs and not being able to use our matte boxes.

Dan
 
The riser extension probably has to be a tiny bit more than 16mm, so others as puredrifting can use their matte box as well. And then folks with the cavision matte box dont have to flip their t-support bracket upside down...
 
I think we have a solution. Stacking an additional RPMD90 (camera plate) on top leaves it around 72-73mm, so I don't think thats the way to go. We added one of our heavy duty risers to keep it flush in the slot of the R15B80 and then attached the riser ontop of that, this gives you a lot of adjustability. When it is flush in the slot of the rear bracket the height is around 80mm, when its not flush and at its highest point the height is 87mm. You'd be able to make up that difference and get it centered by adjusting the height of the matte box with the front bracket.

I'll have a few pictures up shortly.
 
Have any of you tried to turn the adapter 180 (upside down). It will work great too. As for the bracket, you can use 1 of the 3 tapped holes using for mount holder for it. 2 screws for mount holder is more than enough. The only thing is the film plane marker will be off 2mm, just add 2mm to the final measurement. Another draw back is you see our logo upside down :-(
 
I don't think you want to raise it more than 75mm or it will look silly.

Hien, having it upside down creates the same kind of problems for the matte box - you can't raise it up high enough - and will the holder travel high enough?

A
 
I agree anything higher than 75mm would look silly, just was keeping the others in mind who dont have a cavision matte box :)
 
overlandfilms said:
I'll arrange a group buy of the iris rod bracket and rear t-riser and longer socket-cap bolts. Conversely, because the difference is roughly 3/8" of an inch, you could simply add another RPMD90 bracket to the top your existing RPMD90 bracket for an instant workaround. This lists for $35, but we'll help anyone who wants one if they want to jump in on a group buy. Email me or phone for the DVXUser discount.

1194372447.jpg

The left riser is taormina's custom-built piece. The center is a Photoshop lengthened version of the
stock Cavision riser part on the right. Approximate difference is 3/8" in length.

Separately, once we have the L35Extreme in our hands, I'll configure a (more expensive, more versatile) dual 15mm x 60mm to 15mm x 60mm system that utilizes the RS15IIm and other parts to give you something that looks more like this as a global answer for the DOF crowd. It's a more professional solution that will accommodate more lenses with less stress both on the camera to DOF connection and the imaging lenses alike.

MB513H2-2.jpg

19mm to 15mm rods set-up. Note that the L35Extreme could be
overslung, leaving the camera at the desirable lower position.

e
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that last photo, i must know the setup! piece for piece!! Genious!
 
overlandfilms said:
because the difference is roughly 3/8" of an inch, you could simply add another RPMD90 bracket to the top your existing RPMD90 bracket for an instant workaround.
Click to expand...


I tried this with the extreme mounted to an A1 and a Petroff mattebox and it wasn't quite enough height, the rods still had some tilt.

While tightening the riser so it wouldn't tilt, the inside portion of thread chunked off so now I have a useless base. It would be nice if the 3/8" tap on the bottom of the rod plate was moved so that it didn't intersect with the riser tap. This would leave much more thread to tighten the riser. It would also be nice if the riser tolerance was tighter so there wasn't any tilting of the riser in the base.
 
I don't think an extra bracket will do the job with my hv20 and cinecity mattebox. I'll wait for other solutions and keep my mattebox resting.
Regards

p.s. Jason, when replying, go to advanced and there you can upload photos
 
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