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

audiobomber · 07-18-2008, 11:23 AM

Originally Posted by Alfisti

The cheapo consumer 300mm lenses are too slow (aperture not AF). Most are f/5.6 at 300mm and MUST be stopped down to at least f/7 or f/8. Now you're up at ISO800 or 1600 'cos you have no light.

The 55-300mm does not have to be stopped down. It's plenty sharp wide open at 300mm. Stopping down makes it better, but it's not a necessity.

07-18-2008, 11:23 AM	#21
audiobomber Loyal Member Join Date: May 2008 Location: Sudbury, Ontario Gallery Photos: 0 Posts: 526	Originally Posted by Alfisti The cheapo consumer 300mm lenses are too slow (aperture not AF). Most are f/5.6 at 300mm and MUST be stopped down to at least f/7 or f/8. Now you're up at ISO800 or 1600 'cos you have no light. The 55-300mm does not have to be stopped down. It's plenty sharp wide open at 300mm. Stopping down makes it better, but it's not a necessity. __________________ Dan ___ K20D, K100D Super, DA 16-45mm, DA 55-300mm, DA 18-250mm, Kalimar A 28mm f/2.8, FA 50mm f/1.4, D FA 100mm Macro, Raynox 250, Sigma 530 Super flash, BG-2 and Travor battery grips.