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I finally found it...MTF's, etc for the 125 Lanthar!


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41 replies to this topic

#1 stenrasmussen

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Posted 12 October 2010 - 08:51

And all I can say is: WOW!

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  • Voigtlnder_MF_Macro_Apo-Lanthar_125mm_F2.5_SL_linsen.png
  • 125Lanthar_2.jpg

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#2 nfoto

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Posted 12 October 2010 - 08:57

For once, the correlation between an MTF chart and the manifested image quality appears well-founded  ;D

Publishing observations such as this won't exactly diminish the demand for the APO 125 ...
Bjørn

#3 stenrasmussen

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Posted 12 October 2010 - 09:01

For once, the correlation between an MTF chart and the manifested image quality appears well-founded  ;D

Publishing observations such as this won't exactly diminish the demand for the APO 125 ...


Hee hee...and I got a little more...a little snap from a brochure:

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  • Lanthar Brochure.jpg

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#4 AlexV

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Posted 12 October 2010 - 12:01

Where did you get the brochure? I bought one (love it, too) but it did not have the original paperwork.

Alex

#5 stenrasmussen

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Posted 12 October 2010 - 12:45

Where did you get the brochure? I bought one (love it, too) but it did not have the original paperwork.

Alex


I found this image of the brochure on the web somewhere...and to be honest, I have no recollection of the site. Will see if I can find a link.
Actually, here's the one:
http://www2.xitek.co...threadid=130276
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#6 Fons Baerken

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Posted 12 October 2010 - 15:10

I wonder does the lens have a separate cap and not only
this rubber hoodlid :-[,that not unlike
the 14-24 stays put behind in the bag whether
you like it or not. ;D

#7 Andrea B.

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Posted 12 October 2010 - 15:43

My copy has a screw-on cap.
You can probably order one somewhere.

Thx for posting the MTF, Sten. It is interesting in this case to see that.

Andrea B.
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#8 Michael Erlewine

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Posted 13 October 2010 - 13:24

Incredible. It makes sense to me... my favorite lends of all time.

I am not expert at reading MTF charts. How does the above MTF for the 125 Lanthar compare to the Coastal Optics 60mm at this link:

http://diglloyd.com/...f4/optical.html

Founder of MacroStop.com, the All-Music Guide, All-Movie Guide, All-Game Guide, ClassicPosters.com, SpiritGrooves.net, and other sites.


#9 ChrisLilley

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Posted 13 October 2010 - 14:13

For once, the correlation between an MTF chart and the manifested image quality appears well-founded  ;D


Looks great out to 15mm, should be a great lens on DX  >:D
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#10 Hugh_3170

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Posted 13 October 2010 - 14:33


In one of the illustrations, I notice a price tag of 95,000 Yen.  I think that this is the equivalent of around $A1,180 or $US1,150 at the moment.  Interesting to compare this with what the Ebay sellers are asking.



#11 kds315

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Posted 13 October 2010 - 14:41

That was the price when it was available new off the shelf. Considering that only a few 1.000 were ever made, no wonder that it passed the $2.000 mark already (and also considering the weakening USD against the JPY). I bought mine long ago directly in Japan and won't even mention the price (all complete in makers box) to avoid some readers' heart attacks  >:D :angel:
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#12 nfoto

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Posted 13 October 2010 - 15:40

Some of us were plain lucky and purchased the 125 APO before the price hikes. Actually, I bought mine at a point in time where the price had very significantly slumped. Just a few hundred dollars.
Bjørn

#13 Tosh

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Posted 13 October 2010 - 16:21

Drat!  These MTF charts now make it abundantly clear that I'm the dull one in the shooting mage equation.  :(
Glenn

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#14 ChrisLilley

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Posted 13 October 2010 - 17:47

For comparison with the 1:1 MTF. (bear in mind that this one is for 40,20,10 lm/mm while for the apo-lanthar they are at 30 and 10; also that the radius on this one goes out to 40mm not just to 22.5.

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#15 Michael Erlewine

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Posted 13 October 2010 - 18:08

Would one of you please be kind enough to explain what the MTF Lanthar tells us? And, if you are feeling really friendly, how about how it compares to the Coastal Optics MTF I posted above.

Founder of MacroStop.com, the All-Music Guide, All-Movie Guide, All-Game Guide, ClassicPosters.com, SpiritGrooves.net, and other sites.


#16 Fredrik

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Posted 13 October 2010 - 18:09

I think it is very possible that there is a SLII version of this lens on the horizon, as Cosina is very aware of it's popularity.

I wonder what it's MTBF curve would look like  ;D
..even the voices in my head wonder why they still hang out with me.

#17 Erik Lund

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Posted 13 October 2010 - 18:16

For comparison with the 1:1 MTF. (bear in mind that this one is for 40,20,10 lm/mm while for the apo-lanthar they are at 30 and 10; also that the radius on this one goes out to 40mm not just to 22.5.

This is at f/4 ?!?

#18 ChrisLilley

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Posted 13 October 2010 - 19:04

This is at f/4 ?!?


well, its for an f/4 lens. It was just a comparison of another good 1:1 lens.
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#19 ChrisLilley

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Posted 13 October 2010 - 19:20

Would one of you please be kind enough to explain what the MTF Lanthar tells us? And, if you are feeling really friendly, how about how it compares to the Coastal Optics MTF I posted above.


OK, here is my understanding, hopefully others wil chip in to correct things that I may have wrong.

MTF is modulation transfer function. The x  axis is in mm, 0mm is the centre of the lens and 22.5mm is the corner of a full frame sensor. The Y axis shows contrast, from 100% (perfect) to 0% (totally rubbish) :)

The 10 line pairs per mm line will always be higher (closer to 100%) than the 20, 30, 40 or 50 lp/mm lines, and there are certain theoretical limits caused by diffraction so traces for the higher line pairs per mm can't ever get to 100%. (On the MTF I posted, crosses and circles indicate those theoretical points).

Both saggital (lines oriented from centre to edge) and meridional (lines at 90 degrees to the saggital) patterns can be measured. A perfect lens has zero astigmatism and has the same pattern for both types. Real lenses don't.

In broad terms, high and flat and gradually sloping down but not sharply curving down is good. Saggittal and radial not diverging a lot is good. Having the 20, 30 or 40 lp/mm traces (whichever they provide) high and close to the 10 lp/mm is good.

Lenses typically have worse MTFs as they get towards 1:1 magnification (or beyond that to higher magnifications). The posted MTFs for the apo-lanthar are thus interesting because they give results for infinity, for 1:2 and for 1:1. The one I posted was for 1:1.

Things typically not disclosed, but which affect the interpretation:

  • is this a theoretical, calculated MTF or an actual measured one that takes into account manufacturing and assembly tolerances
  • is this calculated for monochromatic light, or for some weighted mix of wavelengths (3, 5, 7) or an actual measurement with a real, continuous light source

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#20 Michael Erlewine

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Posted 13 October 2010 - 19:24

Thanks very much for the intro. I will study it.

Is what you presented for the 125 Lanthar a really good MTF? If I understand what you wrote, it is.

Founder of MacroStop.com, the All-Music Guide, All-Movie Guide, All-Game Guide, ClassicPosters.com, SpiritGrooves.net, and other sites.





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