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Let's play a game once more ...
#1
... and have a look whether you learned something over the last years .... [Image: wink.gif]



I've attached the MTFs of a lens. Which one and what do you see here ?

This is not (really) a joke.



[Image: cool.gif]
#2
Not the SMC Pentax DA 50mm f/1.8? <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='Tongue' />
#3
[quote name='Klaus' timestamp='1349205448' post='20468']

... and have a look whether you learned something over the last years .... [Image: wink.gif]



I've attached the MTFs of a lens. Which one and what do you see here ?

This is not (really) a joke.



[Image: cool.gif]

[/quote]



Prime or zoom?



My first thoughts were, in order:

Sigma 30/1.4

Canon 28/1.8

Sigma 28/1.8

Sigma 24/1.8

Pentax FA43/1.9

Sony 16/2.8



But none really match, maybe the Canon 28/1.8 has the most similar characteristic with the wavy correction at the corners.
#4
Interesting. A pancake?



-- Markus
Editor
opticallimits.com

#5
[quote name='Klaus' timestamp='1349205448' post='20468']

... and have a look whether you learned something over the last years .... [Image: wink.gif]



I've attached the MTFs of a lens. Which one and what do you see here ?

This is not (really) a joke.



[Image: cool.gif]

[/quote]



All wrong so far. Please look 'behind' the question. [Image: rolleyes.gif]
#6
For fun I would say Canon 50mm f/1.0, but I doubt the centre resolution would be so high!



Interesting action in the border/corner region there. Badly corrected spherical aberration?
<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.
#7
[quote name='Klaus' timestamp='1349208306' post='20472']

All wrong so far. Please look 'behind' the question. [Image: rolleyes.gif]

[/quote]



Ah, ok.



MTF not corrected for field curvature? Of a lens with strong FC?



-- Markus
Editor
opticallimits.com

#8
[quote name='mst' timestamp='1349208577' post='20474']

Ah, ok.



MTF not corrected for field curvature? Of a lens with strong FC?



-- Markus

[/quote]



Yes
#9
[quote name='Klaus' timestamp='1349208634' post='20475']

Yes

[/quote]



And the lens is ?
#10
[quote name='Klaus' timestamp='1349210092' post='20476']

And the lens is ?

[/quote]



OEM?



-- Markus
Editor
opticallimits.com

  


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