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Extreme macro?
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PostPosted: Wed Mar 21, 2012 9:31 pm    Post subject: Extreme macro? Reply with quote
What combination/lenses is good to use for most extreme macro photography?
Currently I use a flektogon 35mm f2.4 mounted on bellows, so I can get to about 3:1 macro. But at this magnification lens correction are not good any more so the image is not as sharp as it could be.
A dedicated macro lens without a flowting element won't have a higher magnification than this setup, probably just better correction. What about a lens with a floating element? What happens with magnification and abberation when it is mounted on bellows?

Just for example what I can do now:
Tartaric acid crystals on the bottom of a wine cork (probably @f11)


PostPosted: Wed Mar 21, 2012 9:49 pm    Post subject: Reply with quote
Plenty of options to choose from, I don't have a favorite as I don't need more than 1:1 for my work. Just by incident, I tried reversed lens macro yesterday, with a reversed wide-angle.

These are the grooves on a vinyl record, area shown is likely about 10-15mm wide on the vinyl. Top is full frame and below is 100% crop from lower right 1/3rd of the image. Shot with a Nikkor 24/2.8 Ai-S reversed on a D700, aperture set to f/22. I could have achieved better results by not stopping down so much but I wanted DoF and I was only going to use the photo downsized to 720px anyways so I didn't care about 100% detail.



PostPosted: Wed Mar 21, 2012 10:25 pm    Post subject: Reply with quote
Check out the many samples in this forum of enlarging lenses adapted to bellows for great close focus/macro at a very reasonable price.

BTW many of these lenses have M39 threading mounts, which makes adaptation simple.



patrickh


PostPosted: Thu Mar 22, 2012 1:27 am    Post subject: Re: Extreme macro? Reply with quote
sammo wrote:

Tartaric acid crystals on the bottom of a wine cork (probably @f11)

It looks cleary like diffraction is the limiting factor here. You should try to shoot @ f/4, f/5.6 or so (and maybe use a focus stacking software like CombinZP, Zerene or so to increase the DOF) if you wan't to get better quality out of the same lens.
I have no clue how the floating elements have influence when the lenses are used on bellows though.

I got good results @3:1 be using a reversed 40mm lens on and 100mm macro lens bye the way.
http://forum.mflenses.com/viewtopic,p,1202934.html#1202934

And as I'm a chemist I also have to say that it's actually not tartaric acid but mostly calcium- and potassium hydrogen tartrate Wink


PostPosted: Thu Mar 22, 2012 12:58 pm    Post subject: Reply with quote
Yes, diffraction is the limit, but not clearly, for me it seems that abberations still play a role. Lens abberations limit resolution if I open the aperture more and the image is not as pleasant as the lens abberations are too strong, there is no contrast.

I will probably buy an adapter to try with a reversed lens on short telephoto.

And I'm a chemist too Smile i haven't payed much attention to what they accually are Smile


PostPosted: Thu Mar 22, 2012 1:00 pm    Post subject: Reply with quote
sammo wrote:
And I'm a chemist too Smile i haven't payed much attention to what they accually are Smile


Me too Razz

Why don't you taste? Smile
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