Re: [OM] Look what came from John H. today

[Chuck Norcutt]

For reasons unknown to me f/2.8 is a magic number for the use of Canon 
manual focusing screens.  The special manual focus screens specify that 
they're for the use of lenses of f/2.8 or faster.  They're actually 
slightly dimmer than the standard screen.  I don't know if that's the 
reason for the specification of f/2.8 or faster or if it has to do with 
the angle of incidence of the light rays on the screen... or both.

Chuck Norcutt


Ken Norton wrote:
> Just beware of one thing.  With the 2-series screens wide-angle lenses are
> more difficult to focus.  Some of the 35mm focal-length lenses won't show
> you out-of-focus on the ground-glass.  It's strange, but true.
> 
> Man alive, Joel's 28/2 is a sweet lens.  I developed one of the two rolls
> shot on Saturday and it contains a picture taken with the 28/2.  Wow.
> 
> AG
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