The Nikon I believe is still a great cam, especially for photos.
Problem with the codec is that you can not do much in post such as, color correction, grading etc etc. You really have to film with the look in mind, but of course you know this otherwise you would not be looking into spending another 3000,- for an external device.
Personally I believe its a whole lot of money. If you do not need to use the Nikon much for photos, then I would not invest in the external device. But if you use it for both photos and filming it may be a good investment.
Just saw a review of the Black magic and I was Super Surprised, its 2.5 K (not 1080). Whow, thats really good for that price.
the Blackmagic Cinema Camera. It captures 2.5K (2432 x 1366) 12bit RAW footage with a claimed 13 stops of dynamic range on a sensor that is, at 16.64 x 14.04mm, slightly smaller than the Four Thirds standard. It features a Canon EF mount and the compact body includes a capacitive touchscreen and a Thunderbolt connection.
My first impression is, this is fantastic, still need to look into the specs though, such as the lens etc. but for that price 2.5 K……..whow.
Regards,
Adi Oberoi