On 20 Dec 2003 at 15:06, Kevin Waterson wrote:

> With istD making all our old primes x 1.5,
> is there any change to the aperature eg:
> 
> a 135mm f1.8 becomes effectively a ~=200mm
> but is there any change in the effective aperature?

No, you are simply looking at a cropped area of the image projected by any 
lens.

Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
UTC(GMT)  +10 Hours
[EMAIL PROTECTED]
http://members.ozemail.com.au/~distudio/publications/
Pentax user since 1986, PDMLer since 1998

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