Just working out the tube....

[Sushigaijin]

50 f/2 macro, 25mm tube...

2x life size, give or take.



And a second shot, pushed nearly two stops (!) Noise totally under control, lots of detail, but a bit lacking in color detail, etc.

[Knight]

Gotta hand it to you ,your one Brave SOB. If i saw one of those looking in at 500mm i would be way to close for my liking lol and your doing Macros of them lol

[Loupey]

Looks good, Erik.

You will find that center sharpness does not degrade when using tubes. But distortion and edge sharpness may become a factor - especially when used with zooms.