Originally posted by cps_goodbuy Thanks Marcus for the images
What body were you using? Are they all at 2.8?
Any comments for the images I've posted for 2.8 performance of my copy?
I am using K10 d. I do have a Kx too.
I could not remember the aperture used. Very likely for the monkey, I would have used f2.8 cos it was setting sun then, about 7.00 pm my local time.
At f2.8 the dof is thin. A steady Gimball head is preferred. I bought one and used that for the sign-board post which was a distance of 450 metres. Still, cropped 100 percent, the pics turned out sharp and nice, usable. Higher keeeper rate with the gimball. Now I have to look for another stable tripod and will likely look for benro, the cheaper alternative.
I don't think there is anything wrong with your lens. Its more of getting a stable tripod, a gimbal or some stable support for 300 mm lens is essential. At 3 kg, handholding is definitely out for me.
Other bird shots were taken at f4 or f5.6 and higher iso , monopod used . Holding my breadth when I depress the shutter, to prevent any vibration.
You have a ready model. Try some distance of 20 metre at f2.8 and you would luv the bokeh of this lens, I am sure.
with the subject isolated. Bump up iso for higher shutter speed to be used.
Teleconverter at short distances degrade the image qualilty.
At f2.8, against harsh or bright background, purple fringing is obvious on the subject.
Marcus young