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03-02-2010, 08:38 PM   #16
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QuoteOriginally posted by Marc Sabatella Quote
16-105 is 7X zoom. The largest zoom range I've seen in an f/4 zoom is about 4X (the 17-70). Yeah, I'd expect a 7X zoom to be a *lot* bigger.
What about making it 16-105 f4-f5
f4 from 16-70, f4.5 from 71-90, f5 90-105

03-02-2010, 09:05 PM   #17
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QuoteOriginally posted by Marc Sabatella Quote
16-105 is 7X zoom. The largest zoom range I've seen in an f/4 zoom is about 4X (the 17-70). Yeah, I'd expect a 7X zoom to be a *lot* bigger.
I just got a Pentax-A 28-135mm f4 today, ~4.8X. I guess it's not that large overall - maybe 20% bulkier than a DA 16-45 - but it has a huge front element and takes a 77mm filter. That's the same filter size as the K300/4. It looks like a medium-sized lens with a wide-angle hood already installed.
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