PentaxForums.com - View Single Post - I took the plunge...Pentax DA 18-250mm

*sewebster* · 07-17-2008, 08:08 PM

Originally Posted by k100d

i looked up the specifications of the FZ7 here
Panasonic DMC-FZ7 Review: 1. Introduction: Digital Photography Review and the 35mm equivalent focal length is 432mm. for DSLRs, the 35mm equivalent focal length is 1.5 x the focal length. therefore for the tamron it is 375mm at its longest. which is why the picture is more "zoomed" in on the FZ7.

I think you have a typo since 1.5x300 = 450?

Edit: oops, I think you meant that the Pentax 18-250 has an equivalent of 375mm at the long end (250*1.5), not the Tamron 70-300.

07-17-2008, 08:08 PM	#8
sewebster Site Supporter Join Date: Jun 2008 Location: Vancouver, BC Gallery Photos: 0 Posts: 214	Originally Posted by k100d i looked up the specifications of the FZ7 here Panasonic DMC-FZ7 Review: 1. Introduction: Digital Photography Review and the 35mm equivalent focal length is 432mm. for DSLRs, the 35mm equivalent focal length is 1.5 x the focal length. therefore for the tamron it is 375mm at its longest. which is why the picture is more "zoomed" in on the FZ7. I think you have a typo since 1.5x300 = 450? Edit: oops, I think you meant that the Pentax 18-250 has an equivalent of 375mm at the long end (2501.5), not the Tamron 70-300. Last edited by sewebster; 07-17-2008 at 08:15 PM..*