I don't understand all the conversation about equivalent exposure. I've shot from 1969 to present and I've never used it in weddings, racing, wildlife, landscape & etc. I was aware of it but didn't have a need or use for it.

Back in the film and manual exposure days we used up one & down one much of the time. I have shot backstage in the dark along side a newspaper photographer and both of us were counting shutter speed and apertures. Now that all cameras are electronic you do not have to count at all-its displayed right in front of you.

Raise one and lower the other.

In 2010 I scanned 3,517 rolls of B+W. Color Neg and slide with an Epson Perfection V700 Photo scanner. It took one complete winter to do, but I have it all saved twice. I also have the NIKON Coolscan 5000 which I used on the really good stuff.

I am headed to the Mississippi in Jan for eagles. I am buying it for that firstly and I'll also use my 600mmF:4VR By Feb 2018 I'll be cruising the county roads looking for hawks. The 500 end should be more helpful than 420 with my 300mmF:4 & 1.4EII. At Magee Marsh I'll work the boardwalk with the 2/5 on the monopod with my SB-900 attached. My 600mmF:4 is only used at areas outside of the boardwalk.

I am planning purchasing the 2/5 lens very soon and I am wondering how my D800 will work with the lens. Will images be sharp enough to print 8x10,11x14 and even 16x20? Will the resolution hold up at those print sizes? A friend uses the 2/5 lens with his D500 and his results are very good, but I have 16mp more in my D800. Is it possible the D800 might out resolve the 200-500 lens.
I am new to this forum and this is my first attempt at writing. I hope to have more success here that I had at another photo site.

Thanks
Larry