You are not missing anything. The maximum aperture is the same regardless of
format. What does change is the apparent depth of field for a given distance,
focal length and aperture. The larger the format, the shallower the DOF,
holding those 3 parameters constant.
Cheers,
Nathan
Nathan Wajsman
Alicante, Spain
http://www.frozenlight.eu <http://www.frozenlight.eu/>
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YNWA
> On 30 Jun 2017, at 15:00, Bill Pearce <billcpearce@xxxxxxx> wrote:
>
> I just read a news story on the web about a new 80mm Fuji lens for their med.
> format system. Although he couldn't calculate the effective focal length for
> the lens on the mf camera, he was easily able to state that as an 80/1.4
> lens, it would be an f1.0 lens on the mf camera. Forgive me but I'm
> confused. I remember that when I was shooting large format that we considered
> the 5.6 lens on our 8x10 still a 5.6 lens on our 4x5. What am I missing out
> here? I've seen this business on the web before, but it doesn't make sense to
> me.
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