I have been using the 600/4 GM with the 2X TC to shoot grebes at Lake Hodges for a few months. I have been very pleased with the results. I posted a couple of Grebe Rushing images earlier this year and just posted 8 more on the Nature and Wildlife forum, https://www.fredmiranda.com/forum/topic/1637414 . I will post a few of them below.
I have been using both the A7R4 and the A9 with the 600/4 + 2X TC. Both have performed extremely well with the lens+TC. With the 1200mm reach I was managing to fill a significant fraction of the frame so the advantage of the extra pixels of the A7R4 was attenuated. These images are all shot from the shore off of a tripod with a RRS FG-02 fluid gimble head. The tripod was as low as possible and the lens was about 3 feet above the water surface since I want as low an angle as possible.
Dave
Feb 27, 2020 at 09:57 PM
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