Review on Pentax 16-45mm f/4.0 SMC PDA ED AL Zoom Lens: Compatible with Pentax and Samsung Digital SLR Cameras by Ojasvi Shahas ᠌

As some pentaxists wrote - for birding (photo hunting) you want more, it is treated by buying a converter - relatives are a little expensive, Tamron, Kenko are our salvation. Now I understand that the 1,4x converter is the most for it - it will be 420mm and the picture is still more interesting (despite the drop in aperture ratio) than the Tokina 400mm f5.6 fix is ​​allowed. If you can find at least 40-50 Definitely recommend - you won't regret it! The question of the budget as they say) Regarding the crop factor on this lens, the DA series is designed for APS-C (crop) cameras, but on the Pentax K-1 crop lenses are corrected for full-frame.