Comon Blackbird -Turdus merula

Hi Sam,

Now this is what I call" a bird's eye view" !

Nice shot.

Now for one technical aspect: note on the boundary of the white wall on the right side, there is a slight amount of chromatic aberration seen (blue tone). This shows up on the right side because either your lens imaged this scene near the edge of its field of view, or the lens was slightly de-focused due to the perspective used. This is common in many zoom lens, even those costing more than your lens.

The blue tone can be minimized or eliminated in a program like Photoshop.

The physical way to reduce this effect is to stop the lens down from F/5.6 to F/8.

In practice what this means is that the aberration exists, and will be seen much more on high contrast scenes where "white" exists against other colors (darker).

Best Regards, Mike

Thanks Mike !

The ugly truth is that I shot this bird at an angle thru a double-glazed, thermopane, window....

It's amazing that it still has come out as it did, under adverse conditions like low light & the bird tending to move. Feathers are also difficult to get right under such conditions.

Anyway, it's always worth a try, isn't it?!

cheers

Sam 

Hi Sam,

First, thank you for the e-card.

Wow, shooting through windows at an angle can "soften" an image and chromatic aberration can be amplified by the tilted glass in front of the lens.

Now, it would be good to shoot a bright white wall or mailbox ,etc. against a background scene in open air with the same settings.

Using different zoom ratios on the same white subjects will also reveal whether the lens is corrected across various focal length settings. Use the wide open aperture setting for each zoom position.

Last point: all refractive optics have some level of chromatic aberration. That is Physics. Often, the levels are too small to be noticed or become a part of the image dynamics. Only all reflective optical systems are free from any chromatic aberration.

All the best my friend,

Mike