About expensive lenses

**C J Campbell** · #1 January 30th 07, 08:59 PM posted to rec.photo.digital

On Tue, 30 Jan 2007 11:38:18 -0800, M-M wrote
(in article ):

A Nikon 85mm 1.8 is $400.; an 85mm 1.4 is $1100.

Is the extra stop really worth all that extra expense? Why not just up
the ISO to compensate for those shots that really need the speed?

Am I missing something?

Upping the ISO *always* increases noise. If you want sharp, fine-grained
photos in dim light, you want a faster lens.

--
Waddling Eagle
World Famous Flight Instructor

**Paul Mitchum** · #2 January 30th 07, 10:01 PM posted to rec.photo.digital

C J Campbell wrote:

On Tue, 30 Jan 2007 11:38:18 -0800, M-M wrote
(in article ):

A Nikon 85mm 1.8 is $400.; an 85mm 1.4 is $1100.

Is the extra stop really worth all that extra expense? Why not just up
the ISO to compensate for those shots that really need the speed?

Am I missing something?

Upping the ISO *always* increases noise. If you want sharp, fine-grained
photos in dim light, you want a faster lens.

....or longer exposure times.

Or both. Or all three.

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