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Re: [OM] Looking For Info on Pen System

Subject: Re: [OM] Looking For Info on Pen System
From: "Rand E. Tomcala" <rtomcala@xxxxxxxxxxx>
Date: Wed, 06 Jan 1999 00:05:21 -0500
Joel,
  A bit late, but I knew that I had some of this info around, I just had
to look for it.  This chart lists some half frame lens focal lengths and
their full frame 35 mm equivalent.

Half Frame mm   Full Frame mm
20              28
25              35
38              55
40              58
42              60
50              70
60              85
70              100
90              130
100             143
150             210
200             286
250             360
400             580
800             1150

Rand E.  










"Keith (R.K.) Berry" wrote:
> 
> From: joel2@xxxxxxxxxx  Subject: [OM] Looking For Info on Pen System
> 
> >Anyway I'm assuming since the pen takes half frame pictures that the
> reduces negative size has an effect on focal lengths.  A 250mm for example
> would become a 500mm (35mm equivalent) for example and as a result not just
> the camera would be compact but the entire system >would tend to be smaller?
> So that whooping big 800mm that was made for the Pen should be equal to a
> 1600mm in standard full frame 35mm format?  Correct me if I'm wrong on that
> score.
> >
> No, it's nothing like double. For an 8 x 10 print a full frame negative has
> to enlarged 8 times - a half frame negative has to be enlarged only 11
> times, not 16, so the ratio is around 8:11

> Regards,
> keith_r.k.berry@xxxxxxxxxx

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