I bought a Tamron CF Macro 28-70mm 3.5-4.5 lens on eBay for $35 AUD plus postage - cheap enough to give it a go and see what it's like.
I took a range of photos with my Sony NEX-C3 to get a feel for it on the weekend, and noticed this strange glow around white and bright colours. For example:
Note the bike's water bottle, the frame under the seat, behind the cyclist's head, and the shoulder of the white t-shirt to the left. They are all surrounded by a bright bluish haze, some kind of distortion.
What causes this? The lens was at widest or very wide aperture - is there simply too much light coming through to the sensor?
Note also the distortion in the trees behind the bicycle seat - is this just a low quality lens? Or is this because it's a macro lens, and not intended for this type of shot?