Guess my macro / bellows

[sybren]

Hi folks,

I could borrow a macro bellows from a friend's father. It's an old beasty with a M42 screw mount. Fortunately it fits my Canon 7D as I'm the happy owner of a converter ring. Coupled with a Auto Revuenon 55mm f/1.7 lens it can make tremendous macro photos! Check this out:



Can you guess what it is? Shouldn't be that hard Here is another macro shot using the same setup:

[IABoomer]

I would guess detail on a piece of paper currency. Nice shot.

[PWhite214]

The second looks like a coffee bean. Very nice shots

Phil

[sybren]

Originally Posted by IABoomer

I would guess detail on a piece of paper currency. Nice shot.

It is, but what currency? And what bill?

Originally Posted by PWhite214

The second looks like a coffee bean. Very nice shots

Phil

It is, it was a bean of approx. 6-7 mm, and the bellows wasn't even fully extended. I guesstimate the macro ratio at about 3:1

[BCampbell]

You can do a good estimate by diving the total extension distance by the focal length of the lens, then adding the native magnification. Those lenses usually start at .15x, so to get to 3x you'd need somewhere around 150mm of extension. That's pretty impressive actually, once you start going that far the point of focus can actually move beyond the sensor, rendering focus impossible.

I have a similar setup that I just wrote about, using generic extension tubes with a k-mount lens and adapter, I'm running somewhere around 1.5x. The cheapest way to get decent macro.