If you're not using a through the lens meter, you have to calibrate 
your lenses for exposure. I frequently used a handheld incident meter 
when shooting transparency film with my 6x7. But I had an exposure 
compensation factor for each lens. For example, I think my 300/4 
required 1/2 a stop of extra exposure, while my 105/2.4 was right on.
Paul
On Jun 28, 2006, at 7:10 PM, Don Sanderson wrote:

> Uh guys, maybe I'm missing something but unless someome is lying
> about their product isn't f/4.0 always supposed to be f/4.0??
> It'd pretty much leave slide shooters who use a manual meter SOL
> if it wasn't, wouldn't it?
>
> Don
>
>> -----Original Message-----
>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of
>> Joseph Tainter
>> Sent: Tuesday, June 27, 2006 7:38 PM
>> To: [email protected]
>> Subject: Seen on eBay
>>
>>
>> "A prime 2.8 lens is actually faster than a 2.8 zoom because of the
>> increased contrast which you'll find remarkable in comparison to your
>> zoom lens."
>>
>> Got that?
>>
>> Joe
>>
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>
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