These are some out-of-the-camera shots and sections. They are the unenhanced/unsharpened JPG's straight from the SD card. etc.
Taken on the Canon EOS600D with the 75-300 IS USM, which is the lens above the cheapie versions.
Aperture Preferred Auto at
f9 (around 1/320sec) and
tripod mounted.
I was testing auto-focus with/without the Image Stabiliser, and was interested to see that, with it turned on, over time (3~4 seconds) the image moves slowly a significant distance to the upper right, then slowly re-centres over the following 3~4 seconds. So images taken using the Stabilizer can have entirely different edges depending on when in the cycle you fire the shutter.
Thought that interesting.
But I publish these for Jenchris who seemed unhappy with the focusing performance of the 75-300 that came with her camera kit, so she can compare the performance of a lens that may be a few hundred dollars dearer, yet not the cream of the Canon crop.
I still don't know if the two have similar optical element configurations though.
The full frame shots are reduced from 5184px to 1200px and links are provided to Dropbox to download the full res versions if a closer look is desired.
1/ 75mm full frame
2/ section of 75mm
3/ section of 75mm
4/ 300mm full frame
5/ section of 300mm
6/ section of 300mm
The bridge in the 300mm shot is about 700-800 metres away,
The little Lighthouse in the 75mm shot is about 70mtrs, and the '
Origen' tank is more like 350mtrs
Full Res here:
75mm -
https://www.dropbox.com/s/mp6fcr15hz...t%202.jpg?dl=0
300mm -
https://www.dropbox.com/s/ue21g2zlie...t%201.jpg?dl=0