WildernessTracker wrote in post #17506118
The first bird was taken using a really old 75-300mm lens (no IS and noisey to focus). I can easily edit out the CA in Lightroom.
yes, some CA can be edited out, some not so much. IMO, the jackdaw feathers around the head might be suffering from some kind of lens aberration that destroys detail in such a way that it cannot be fixed.
What is classed as high ISO? I have never liked going too high and if I do I end up over editing it by trying to remove the noise. I can try and let the camera pick an ISO when shooting birds in flight.
you were shooting at 200. If you to to 400 you could stop down to f/8 for the same exposure. If you went to 800 you could then go to 1/500 with no hit on exposure. I don't think you will see a big hit in image quality simply by increasing the ISO, it's all a balancing act though. Depending on output, and your ability to not zoom in too close on your computer monitor, ISO 1600 or 3200 can be very useable.
When you say stopping down one stop from max aperture, do you mean going from f5.6 to f8 (still not fully got my head around stops

)?
yup. "Wide open" is using a lens at max aperture, "stopping down" is using it at less than maximum. By stopping down you are using a smaller portion of the lens and therefore reducing the effect of any flaws in the lens. As far as i know, this holds true for every SLR lens ever made.
However you eventually reach the point of diminishing returns as diffraction creeps in at very small apertures, f/11 and above for instance.
PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20