1 hour ago, Interceptor121 said:
I have used the Olympus 300mm f/4 and the Panasonic 200mm f/2.8 primes
I had the Olympus on loan for a week and concluded it is a fine lens but 300mm f/4 as start is too long unless you are shooting small birds all the time. So I now have a Panasonic 200mm f/2.8 it comes with a 1.4 TC that appears to have a very very marginal loss. So I have a 200mm/2.8 lens that is fast and if I need reach a 280mm f/4 that performs as well as the Olympus 300 f/4
I wrote a review on dpreview https://www.dpreview.com/forums/thread/4531092
Clearly if small birds are all you shoot it makes sense to start at 300mm if you get a good price however I would not recommend to take a 2x TC and run the lens at f/8 for 600mm
Thank you for the comment (I have read your interesting review in DPReview). The Pana 200mm is an interesting lens, but too close to the 40-150mm Zuiko Pro with 1.4x TC (that I already have; it is rather heavy, but brilliant), the 300mm will cover a better range...
I wanted to point out that at 7500$ for the 150-400mm, I am out. I cannot imagine that there will be many buyers except "influencers", "ambassadors" etc., that get supported by olympus for spreading enthusiastic reviews. This lens will not help to keep OMD alive...
(Up to now I am not shooting birds with tele, but for years now we have a couple of falcons that nest on a big Austrian pine in our garden. It starts with the fighting who will settle down and breed this season and ends with few days, when the cute little ones make their first attempts to fly. I have to go for a good tele to make pictures next spring....
)
Wolfgang