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Canon 20mm f3.5 Macro Bellow Lens

Started 4 months ago | Discussions thread
Joseph S Wisniewski Forum Pro • Posts: 35,461
Re: Canon 20mm f3.5 Macro Bellow Lens
1

SigmaTog wrote:

Thank you everybody for your great professional replies, all very much appreciated.
I had the lens on blackened tubes. I can now see that bellows would be better with all those angled pleats inside.

Almost always. The angles in the bellows make them near perpendicular to the light from the lens, and that really helps reduce reflection.

Tubes tend to have light grazing them far from perpendicular (almost parallel sometimes) and that tends to make even the best black paint appear surprisingly reflective.

Over on photomacrography.net there are multiple threads about flare control and the various paints, flocks, etc. that people have tried. Unfortunately, half of them end with "___ is the best I've ever used, but they don't make it any more."

(And why is your post and my reply showing in bold?)

I have tried a baffle inside the tube with a 12mm hole, about 20mm behind the lens & that worked,

Excellent!

I've always been baffled why people don't try this more often. It's simple, easy, and quick. You can get black flocked paper from a scrapbook store that might not be what you want to line a tube, but sure makes great baffles.

I will try a bellow too.
All the good points of the lens mentioned above are true for mine too.
" there are easier ways to get to high mag while still preserving full automation ", what are the choices please ?

I have no idea what that poster meant by "full automation". Autofocus isn't much help at 5x, if you're doing stacking you want to set exposure manually anyway, and letting the lens motor handle the stacking under camera control instead of letting a focusing rail do it with its own controller doesn't strike me as optimum.

Maybe wide-open composing?

I am trying to photograph a luminescent beetle's shell at magnification to see the structure of the surface. The dynamic range is large.
PS I made a mistake with the scale, the interval should be 0.1mm.

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The term "mirrorless" is totally obsolete. It's time we call out EVIL for what it is. (Or, if you can't handle "Electronic Viewfinder Interchangeable Lens" then Frenchify it and call it "LIVE" for "Lens Interchangeable, Viewfinder Electronic" or "Viseur électronique").
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Stanley Joseph Wisniewski 1932-2019.
Dad, so much of you is in me.
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Christine Fleischer 1947-2014.
My soulmate. There are no other words.
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Rahon Klavanian 1912-2008.
Armenian genocide survivor, amazing cook, scrabble master, and loving grandmother. You will be missed.
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Ciao! Joseph
www.swissarmyfork.com

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