Do you find that you do OK with the mounting and never
need to move the chips around for the best window?
Not a criticism, just a technical question.

This is what makes the RBTs so great for 35mm. Maybe
RBT could be convinced to make a 120 mount...?

-kp

Dr. Kevin Pernicano
Louisville, KY, USA (Home of the Kentucky Derby)

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Do you find that you do OK with the mounting and never
need to move the chips around for the best window?
Not a criticism, just a technical question.

This is what makes the RBTs so great for 35mm. Maybe
RBT could be convinced to make a 120 mount...?

-kp

Dr. Kevin Pernicano
Louisville, KY, USA (Home of the Kentucky Derby)

____________ _________ _________ _________ _________ __
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail. yahoo.com

I'm able to move the chips left and right to adjust the window and
(up and down too) to adjust the composition a little bit. I don't
see any limitation in comparison to the RBT mounts in that regard,
am I missing something?

I also mount 5P using RBTs and thought about creating a system that
added perfs to the MF slides so they could be mounted in the same
way. But now that I'm using it, I find the 3D world mounts and
mounting jig easier to use. I'm not sure why though, partially
because the RBT mounts aren't secured to a jig, maybe because 5P
film chips are smaller and therefore more "fiddly".

--- In MF3D-group@yahoogroups.com, "Bob Schlesinger" wrote:
>
> The thing that makes the RBT mounts so easy to use are the fact
that they take advantage
> of the sprocket holes in 35mm film. Since 120 film has no holes,
I don't think their system is going
> to be of any help.
>
> Bob Schlesinger
>
> *********** REPLY SEPARATOR ***********
>
> On 10/18/2007 at 4:46 PM Dr. Kevin Pernicano wrote:
> Do you find that you do OK with the mounting and never
> need to move the chips around for the best window?
> Not a criticism, just a technical question.
>
> This is what makes the RBTs so great for 35mm. Maybe
> RBT could be convinced to make a 120 mount...?
>
> -kp
>
> Dr. Kevin Pernicano
> Louisville, KY, USA (Home of the Kentucky Derby)
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>

> I also mount 5P using RBTs and thought about creating a system that
> added perfs to the MF slides so they could be mounted in the same
> way. But now that I'm using it, I find the 3D world mounts and
> mounting jig easier to use. I'm not sure why though, partially
> because the RBT mounts aren't secured to a jig, maybe because 5P
> film chips are smaller and therefore more "fiddly".

The pin bars of the RBT system make 35mm film mounting very fast and
accurate, provided that the film chips come from a stereo camera (or other
well-aligned systems) and therefore do not have rotation or other serious
misalignments built into them.

You don't need the secure the RBT mounts (at least, I don't). I just put
the pin bars in the half-mount, place the film chips in the pin bars, and
slide the bars to adjust the stereo window while I freeview the pair. It
only takes seconds and the result is perfect accuracy, without any rotation
error. Rotation errors are the anathema of stereo mounting. I see it all
the time when people do NOT use RBT mounts (other mounts with positioning
tabs or channels, have some slack and not everyone can do a good job with
these).

If you try to mount in RBT mounts without using the pin bars (this is
sometimes called free-mounting or "floating"), then you need to secure the
mount, someway to view what you are doing, and then the smaller 35mm chips
are not easy to manipulate. It is much easier to free-mount with Medium
Format film chips.

George Themelis