11-01-2017, 08:07 PM
At this moment, I'd say e.g. a Nikon D500+200-500 or a third-party 150-600mm would be a better option for birders such as yourself.
As for Pentax, I believe their strategy should allow them to expand their product line with OEM products, rather than rebadges (as a birder, why would you get a Pentax with a weaker AF, and the same lens you can buy cheaper for Canon/Nikon?).
Even "killing" the 150-450 might be a mistake, while you'd love the added reach of a x-600mm lens, others might prefer the more manageable and shorter lens.
Last but not least, the DA 560mm f/5.6 is much more affordable than a 600mm f/4 from the other manufacturers.
As for Pentax, I believe their strategy should allow them to expand their product line with OEM products, rather than rebadges (as a birder, why would you get a Pentax with a weaker AF, and the same lens you can buy cheaper for Canon/Nikon?).
Even "killing" the 150-450 might be a mistake, while you'd love the added reach of a x-600mm lens, others might prefer the more manageable and shorter lens.
Last but not least, the DA 560mm f/5.6 is much more affordable than a 600mm f/4 from the other manufacturers.