Roundshot VR Drive Nodal Point

[Bill Gercken]

Hi,

Hope its OK to post this question here – I have not found a Roundshot forum where I can post newbie questions.

My question is in regard to positioning the camera on the slide for indicating the nodal point. The instructions do not indicate that you need to align the end of the nodal slide with any part of the camera. So when you enter the “B” point into the software is it really just an arbitrary number that is on the slide relative to the camera/lens combination entrance pupil? Or is the value actually used to calculate something in the software? When initially mounting the camera to the slide I locked it down in a position where the rail would not cause vignetting of the lens.

Thanks!
-bill

Roundshot VR Drive Nodal

[Bill Gercken]

Talked to my distributor and he answered my question. Yes the number entered is just a reference to the camera/lens and fixed position on the slide. (I did not see a way to delete my original post.)

Cheers!

[Luc Villeneuve]

Your distributor is right, it’s just a reminder for the position of the camera on the rail. If you use different lenses, you have your reference. Personally, I printed the X ? Y values and stick it to the main part of the robot so I can adjust the position even before I start the VRDrive.

On Facebook, the is a group dedicated on Robotic photographic equipment. https://www.facebook.com/groups/689193057759496/

[Bill Gercken]

Thanks Luc!

I appreciate the link.

Cheers,
-bill

[Luc Villeneuve]

Bill Gercken wrote:

My question is in regard to positioning the camera on the slide for indicating the nodal point

Personally, I have 2 sets of stoppers. One in the front and the other one in the back. Back stoppers are at the very back of the rail. No matter the lens, I never move them.

[Bill Gercken]

That is what I wound up doing. I am actually using a RRS short rail for the wide angle lens setup (Sony A7s/Zeiss Batis 18) with one slide stop on the back. Great idea adding the second in the front. That will definitely make it easier to attach in the dark.

Thanks Luc!

[Author]

Posts