[LargeFormat] Gundlach 12" Radar in #5 Betax

[Clive Warren]

At 10:57 am -0600 31/12/01, Ken Hough wrote:
>  >----- Original Message -----
>>From: "Clive Warren"
>>
>>  > Does anyone have a Gundlach 12" Radar lens in a #5 Betax shutter? > I
>>have some questions about how the elements are spaced and held in > the
>  >shutter!
>
snip
>>On close inspection of the front spacer it seems that there are four holes
>>that have been filled in on the inner diameter at the top. I cannot imagine
>>that these would be for holding screws as the front spacer surely is screwed
>>into the front of the shutter?
>>
>>Anyway, before applying any real force to the front spacer in an attempt to
>>unscrew it, does your 12" Radar have a similar spacer and does it unscrew?
>>Are there four filled in holes in the top of the inner diameter of the
>>spacer?


>The (spacer) threaded bushing was done so that huge barrels outer diameter
>could be done. I just put a lens spanner in it and turn.  I have a 
>lathe to hold
>the body of the shutter in.  All the ones I have are like that too.
>By the way 1/50 top speed is a dream. if you adjust the 1 sec time the fastest
>1/50 goes is 1/25. If you adjust the 1/50 so its correct, 1 sec is 1/2 sec.
>I have several BRAND NEW Betax 5s. Every one is like that.

My old South Bend lathe may not be able to hold the rather large 
diameter of the outer shutter assembly, however I can improvise.

When you say that you are using a lens spanner to remove the large 
bushing (spacer), do yours have the drilled holes in the top inner 
diameter - are you using these to insert your lens spanner? Are yours 
filled in before you start?

I probably can't afford the additional expense right now, but are you 
willing to sell one of your new Betax 5s?

All these questions and with a raging hangover.....

Cheers,
        Clive