Difference Between Regular and Model II RB Prism

[neil_poulsen8]

<p>I'm wondering what differences there exist between a "standard" and the Model II RB prism that I've seen advertised on a certain auction site. Are the optics better in the Model II? Less distortion? </p>

[marc_batters]

<p>Not so much a difference in optical design. Two different styles of prism housing designs; one early and one later.</p>

<p>RB Pro SD's and original RZ Pro's were made simultaneously for quite some time, maybe a decade. <br /> At some point, Mamiya discontinued the squat RB prism housing, and adapted the RZ prism housing for the RB.<br /> Why continue making two separate prism housings, when one would do? The Type II prism was born.</p>

<p>I'm a RZ'r, but many RB users prefer the original RB prism over the Type II. It's a bit shorter and the viewing angle is close to 45 degrees. The type II, (and with all RZ prisms), the viewing angle is closer to straight-on.<br /> The optional, adjustable diopter/magnifier will fit either prism style.</p>

[david_pidcock]

<p>Exactly what Marc said. Plus the metal of the original and the "plastic" of the II prism makes it lighter and easier to handle.</p>

[jim_peterson2]

<p>I don't know if you've seen any good photos of them so thought this might interest you.<br>

<a href="http://chemicalcameras.wordpress.com/mamiya-rb67-professional-sd/">http://chemicalcameras.wordpress.com/mamiya-rb67-professional-sd/</a><br>

Unfortunately the older one I have isn't just the regular prism viewer but rather the metered one. But the unmetered one looks similar, just without the switch and dial.</p>

[jim_momary]

<p>Below is the PD Prism Finder (metered).<br>

Uses a 6V 4SR44 or 4LR44 battery.<br>

LED readouts.<br>

Works well.<br>

Jim M.</p><div></div>

[neil_poulsen8]

<p>Thanks for all the responses. Looks like I have two of the original, one with meter and one without. They really add to the weight of the camera. So, I think it makes sense to look for a model ii. </p>