Originally posted by biz-engineer For the shot of the Cormorant, I used the electronic shutter to reduce vibration because of cropping, every pixel counts. But... for every other shot when using the viewfinder because PDAF is so much faster than LV AF, I couldn't use the electronic shutter. For being able to use an electronic shutter, PDAF should be one the image sensor itself. There was a guy next to me with a D810 and 600 f4, we compared the same photos, his with magnetic shutter of nikon D810 (+gitzo tripod and Jobu gimbal) and mine with DFA150-450 K1 crop mode and electronic shutter. It was hard to see any difference between the D810 image 100% zoomed and the K1 image cropped, the D810+600f4 was only a tiny bit sharper but really hard to justify the cost difference with the Nikon combo and the Pentax combo. It seemed to me that with long lenses vibration can ruin pixel sharpness of the most expensive gear.
I recently sold my Tokina 800 mm f/8, a lens that comes in 2 sections, plus the heavy duty tripod and the Velbon "magic arm" with modifications I did to it to enable freedom of motion while getting the mirror slap stabilization down the tube of the 30 inch long lens to a Canon full frame user. He was impressed with my photos using the lens with one film SLR and 2 Pentax DSLRs. During the trip to the same location for him to try out the lens he told me he wasn't getting good results from his Canon 200 mm f/1.8(!!), 300 mm f/2.8, 400 mm f/2.8,100-400 mm f/4. He then said he was mostly using a P&S(?!?!!) with a 20X zoom for good shots at long ranges plus a Nikon spotting scope with a 40X eyepiece. He took his 1DS MK 3 and the 5D MK 2 with us and all the lenses along with 3 tripods(all Carbon fiber) and 4 gimbals! I spent an hour or so demonstrating the 800. It takes about 30 minutes to get it setup, leveled, lens assembled and onto my gimbal, camera body and then attach the stailizing arm to the body. I used my K-5 and not my K-10-D which was one that gave me great images. I set it to f16 after focusing at f8 with focus confirmation. The shots were fair but not up to my best because I had never used a preset lens on the K-5 in "M" Made lots of mistakes. during all that time he never set up a camera! He did set up his spotting scope. I have never used one and could not spot the items I was shooting through it due to extremely narrow angle of view. He thought my shots were great. After several hours of shooting we packed up and went for lunch. When we arrived back at his home I showed the photos all of which were a bit blurry because I was getting focus confirm from trees only 1000 feet away. This was a hot August day with lots of haze over a large lake yet the shots of a marina about 3 miles away were good and the ones of a large condo with balconies 5 miles away were good. I should say snapshot good comparable to a P&S camera. He showed me the shots he had taken with his Canon bodies. All with AF and IS and they were bad. I found out that he didn't understand how to set his cameras at all. I taught him more about his cameras without opening a manual for them than he had known in years of attempted use. He thought the cameras would do it all! He did not know the difference between a MF switch on a lens and a fully manual lens. I found those bodies easy to set up for actual MF. I learned from him that he had been sold this gear from our biggest photo store who push Canon a lot and he attended their classes to learn about the cameras. He had never seen the performance of a Adaptall 70-210 f3.5 19AH lens which is brighter than all of his shorter zooms. I have the Pentax copy of his 28-200 f4-5.6 zoom and my images from it look better. I was not critical of his framing and camera control but did attempt to help him learn that the operator must help the DSLR do it's job. He has about $40,000 invested in his 6 tripods 5 gimbals and 20 or so lenses. He said he didn't care if the 800 ever worked for him after he had paid me. It was cheap and he could resell it or junk it. He wasn't sure good photos could be taken with "old junk lenses". By that time he had learned about all he could and would get angry when I suggested practice with his cameras. I am on my tablet without access to shots taken with my 800 but I will post some!