Re: Saltzman enlarger has arrived

"Thor Lancelot Simon" <tls@[EMAIL PROTECTED]
> wrote in message 
news:fru2eh$t8r$1@[EMAIL PROTECTED]
> In article <1eist3pmgrbap8orv4s1f260u8581ent7s@[EMAIL PROTECTED]
>,
> John  <use_net@[EMAIL PROTECTED]
> wrote:
>>On Sun, 16 Mar 2008 18:07:01 -0700, "Richard Knoppow"
>><dickburk@[EMAIL PROTECTED]
> wrote:
>>
>>>The latter was mostly made for aerial mapping from
>>>10x10 negatives.
>>
>>Just a little question about this as the previous owner of 
>>my D138 was
>>working in this field. How fast do they usually fly and at 
>>what
>>altitude ? I'm pretty sure he told me they were using 5" 
>>roll film for
>>this.
>
> I thought aero film for mapping was 10" or 5" rolls, 
> giving a 4 3/4" or
> 9" square negative?
>
> The diagonal of 9" square aero format is a little smaller 
> than the
> diagonal of 8x10" sheet film which is, supposedly, why 
> some lenses
> designed for mapping work, such as the Metrogon, do not 
> really cover
> 8x10.
>
> -- 
    The actual negatives are about 9x9 but the enlargers are 
set up for 10x10. Once upon a time you could get 10x10 
paper. I used to get it at Freestyle and use it for 
Rolleicord pictures.
    The coverage of the Metrogon and some other aerial 
lenses is probably marginal for 8x10.


-- 
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@[EMAIL PROTECTED]