Here is an example of Sonnar 250f5.6 on A900 with HB extension tube. Natural light f8, 1/400s.
[url=http://www.flickr.com/photos/bigsu ... .jpg[/img]
DSC32468autocontr by BigSury, on Flickr[/url]
Here is the crop to show some details....
[url=http://www.flickr.com/photos/bigsu ... .jpg[/img]
DSC32468autocontrcropflower by BigSury, on Flickr[/url]
Here is the set up with extension tube and converter....
[url=http://www.flickr.com/photos/bigsu ... .jpg[/img]
DSC16603 by BigSury, on Flickr[/url]