[LargeFormat] On Location

[Clive Warren]

At 5:36 pm -0800 20/2/02, Jim wrote:
snip
>
>Charlie,
>
>I suspect that your 150 & 210 are f/5.6 lenses. The 90 is f/8. It is 
>a well known fact that the wider the lens, the more difficult it is 
>to see to focus. My belief (and practice) is that the wider the 
>lens, the wider the max aperture needs to be. Which is why my 75mm 
>lens (a Rodenstock Grandagon) is f/4.5 and I have no trouble 
>focusing. I rented an f/8 90mm Super Angulon and couldn't see a damn 
>thing! Dismally dark GG image. My 120/180/210 are all f/5.6 and give 
>a bright image. My long 720mm Nikkor is f/16 max and is bright and 
>easy to focus.
>
>What I am saying is, is it possible that you simply cannot focus the 
>dim f/8 90mm GG image?
>
>Jim


The double posting may have had something to do with your friendly 
ol' ListAdmin. Anyway, it's welcome traffic.

You're right about that dim image - that was the lens I was using 
when I thought I had gone blind ;-)

In the big wide outdoors I find the GG image plenty bright enough but 
in a dim interior it can be challenging if your critical area of 
focus is small. Having said that, even with the f8, once I figured 
out that my eyes no longer focus closer than 6 inches without 
assistance there was no problem in focusing......

So Charlie, do you think you could be optically challenged like me?

Cheers,
       Clive