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Message: <blockquote data-quote="Chosun Juan" data-source="post: 3636704" data-attributes="member: 92780">GREAT  question!   <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />I am currently mulling over several options ....Upgrading to the more hand filling grip and greater frame rate of  the Nikon D500 + maybe the 200-500 f5.6, or the Nikon D850 + 600 f4 and TC'S (madness!! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />,  and/or the Sony RX-10 IV .....What I know for sure is that I would like a bit more sharpness at 600mm than the Tammy offers. I would also like a larger aperture than f6.3 --- f5.6 or numerically less. This will involve more weight and cost, with the weight being the issue of greatest concern. I also know that the Sony's grip is not quite hand filling enough for ultimate satisfaction (a friend has the RX-10 III which I've tried) - though this might be a small sacrifice to make on the Mk IV given its many other advantages.I wish Nikon would hurry up and reduce the weight of their 300mm f2.8 down to ~2200 grams and give it some FL glass already. It would work great with a 2x TC on the D500 (I have a friend who runs the Canon equivalent - 7D MkII + 300mm f2.8 IS II + 2x TC ..... very nice, well apart from the Canon sensor which the Nikon D7200 flogs).Then of course Canon has the lovely 400mm f4 DO IS II that takes a 1.4x TC beautifully (for which Nikon has no equivalent), and the rumoured 600mm f4 DO IS III should make an appearance within the next ~12 months (for which Nikon has no comparable - pull your finger out Nikon! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />. Honestly a 600mm F4 DO (or PF) sounds like something of a holy grail ..... I would be on it quicker than a seagull on a hot chip!!!Then there is the Canon 7D MkIII which will inevitably arrive (when ????) but will it match the D500??? Also, what could Canon do with a hi-res upgrade to the 5D - could it match or surpass the Nikon D850 for DR and fps? You would think Canon would be sick of getting trounced by Nikon in bodies by now .....Arrrggggh! Decisions Decisions and forever just out of reach damn dangling carrots!  :-OPerhaps the Sony RX-10 IV makes a very sensible interim or even final resting spot!  :brains:I agree with you about the fun beginning at 600mm. My 150-600 Tammy is nearly always maxed out and the D7200 on 1.3x in-camera crop factor (this gives me about 1150mm equivalent @ 14.2MP all things considered) .... I would say it's needed about 3/4 of the time. A much shorter minimum focus distance (MFD) than 2.7m would help on a bit more too.The Sony will crop losslessly (ie not digitally) to 900mm @10MP, and 1200mm @5MP, and the MFD is 0.72m, so that will be handy.  I am due to trial the Nikon options I mentioned in a couple of weeks - hopefully I can get my hands on the little Sony to compare too   :t:Chosun   :gh:</blockquote>

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