i will have to go back and check my data on the shot. that was pretty much the first day with it. i was kinda just messing around i cannot say i put to much time into the shot, it was just a test in my backyard. i will say the lens has some CA issues in high contrast areas, i would say thats one of the biggest downsides to the lens. i did a little tweaking on it along with some sharpining, but you might see the purple in the white of the squirls eye. i heard with NX view, or NX capture, you can do much more with CA and this lens. personally i dont edit with those, i use photoshop and lightroom. but for the price i can live with a little CA, i think it really is only going to be a problem rare occasions.
i am almost possitive the camera (d800) was in dx crop mode or around 15mp. for that photo and may have cropped a little more. more about the lens. wide open with a teleconverter its a little lacking in the contrast department. stop down a bit like the squirl photo its much better. also just add a little contrast in editing if its ever a problem. i will say the lens is good wide open at F4 with no converter. even with the converter i was suprised that vignetting is almost non existant.
i think the lens is pretty easy to use. its really not too bad in size. remember its a prime 500mm. i ordered a new lens foot plate, as you can see my tripod foot setup really sucks. i found a 2 screw arca style foot that will work with my arca swiss knockoff ball head. personally i see no need for a special wimberley head, my ball head is rated for 40lbs, and the legs at least 15 or 20lbs. im very happy using my ballhead with the lens.
i even use it sometimes with no tripod. its hard to manual focus and hold the lens, but for a few shots, maybe a couple minutes without rest. i find it also not much worse then a tripod if you have a place to lean it on to steady and rest some of the weight. i was on a wildlife reserve the other day. and was driving my car and shooting with it out the window LOL. i was the only person in a huge reserve so i could basically stop in the middle of the road. cool cause i would one hand put the lens and camera in the passenger seat and grab it.
i think one of the hardest parts of the lens is, going to be the same with any super telephoto prime. finding the thing you want to take a picture of, at 500-700+mm its sometimes hard to spot your subject, deffently when its out of focus. a small bird is gone before you can spot it and get it in focus. i think i need to invest in one of those scope things that you put on your hot shoe, i think they are called hot shoe finders, mostly made for mirrorless cameras without viewfinders.
i will deffently keep adding more info, may start a thread on just a review, with more info for people thinking to try this old lens. i need more time to use the lens, and get the TC16A autofocus converter which is on order...