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06-04-2012, 03:48 PM
(This post was last modified: 06-04-2012, 04:43 PM by Brightcolours.)
The Nanoha 5X gives 4:1 to 5:1 magnification, making it an alternative to the unique Canon MP-E 65mm.
http://www.yasuhara.co.jp/nanoha/index-e.html
http://www.megapixel.co.il/english/archive/31121
Wow! A super lens with an affordable price. But I think only a very small group of people need it.
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06-05-2012, 08:15 AM
(This post was last modified: 06-05-2012, 08:22 AM by Rover.)
http://www.lensrentals.com/blog/2012/05/...n-actually
However, I guess it's gonna be a long haul before Photozone reviews that. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt=' ' />
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[quote name='Rover' timestamp='1338884127' post='18686']
http://www.lensrentals.com/blog/2012/05/...n-actually
However, I guess it's gonna be a long haul before Photozone reviews that. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt=' ' />
[/quote]
Photozone focusses on resolution tests. Macro lenses can't be tested with normal MTF targets, so do not expect any photozone review of this lens (or indeed the Canon MP-E 65mm).
What is the effective aperture at 11 and 5x magnification?
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[quote name='karlmera' timestamp='1338923789' post='18693']
What is the effective aperture at 11 and 5x magnification?
[/quote]
f/66. Those scared of entering diffraction should run away now. I really wish the MP-E65 had the built in light option as that really helps at higher magnifications.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
Well I suppose that F=11 is at x4 times since this is the maximum focus distance
At least that is according to the specification of similar product that I use - Dino lite microscope.
Anyway the blue LEDs pushes the diffraction a little bit further.
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[quote name='popo' timestamp='1338935932' post='18694']
f/66. Those scared of entering diffraction should run away now. [/quote]
It may well be F/90, if F/11 is calulated purely based on aperture diameter rather than effective aperture <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt=' ' />.
Quote:I really wish the MP-E65 had the built in light option as that really helps at higher magnifications.
I use LiveView for that <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt=' ' />.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....
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I'm using the effective aperture value = physical aperture value * (1 + magnification) as given in the MP-E65 manual. Seems to work well enough for everything I've thrown at it, although of course I can't say it'll be perfect always.
Liveview doesn't help with the "no light" problem of tiny effective apertures (5x mag and f/2.8 = f/17 effective) and the very short working distance meaning you shadow what little ambient light there is.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
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[quote name='popo' timestamp='1338992443' post='18709']
I'm using the effective aperture value = physical aperture value * (1 + magnification) as given in the MP-E65 manual. Seems to work well enough for everything I've thrown at it, although of course I can't say it'll be perfect always.
Liveview doesn't help with the "no light" problem of tiny effective apertures (5x mag and f/2.8 = f/17 effective) and the very short working distance meaning you shadow what little ambient light there is.
[/quote]
For all intends and purposes your used formula is fine (and obviously that is why it is used in the MP-E 65mm manual. For longer (focal length) macro lenses it underestimates the effective aperture somewhat. To get more accurate calculations one will need to know the pupil magnification: Effective Aperture = Lens Aperture x (1 + Magnification / Pupil Magnification). This can result in quite larger f-values. Another problem will then be that the pupil magnification changes with focus distance, so per magnification level the pupil magnification value will be different.
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