[rollei_list] Re: Kalart RF's & beam splitter mirror
- From: "Maurice M. Greeson" <maurice@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Mon, 26 Mar 2012 10:13:16 -0600
Edmund Scientifics still offers a 50% beam splitter mirror:
http://www.scientificsonline.com/mirror-type-beamsplitter.html
Maurice
On Mar 25, 2012, at 9:18 PM, Richard Knoppow wrote:
>
> BTW, I wrote an article on adjusting Kalart RFs which is buried somewhere
> on the Graflex.org site. I need to re-write it both to clarify it and to add
> some stuff. For a while Edmund Scientific sold squares of semi-reflecting
> glass which was perfect for replacing the fixed mirror in Kalarts. I don't
> know if its still available. It can be cut with a carbide scriber and is held
> in with shellac.
> The official instructions for the Kalart don't document a couple of
> critical settings. In fact they are not difficult to make. If the infinity
> settings and bed position are not correct its nearly impossible to make the
> thing track over its full range. If its set up properly its quite accurate
> at all distances. One problem, and its a problem with any camera which is
> not focused directly using the image from the taking lens at its intended
> f/stop is focus shift. This is due mostly to residual spherical aberration.
> Even some very good lenses have enough to cause some focus error when focused
> wide open and then stopped down. That affects virtually all cameras other
> than view cameras and SLRs focused at the taking stop. It can cause a
> rangefinder camera to appear out of adjustment or to take slightly blurred
> pictures. Even Rollei TLR cameras suffer from this and I suspect its often
> the cause of focus errors which are blamed on film buckling.
>
> --
> Richard Knoppow
---
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