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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 02 Mar 2017 (Thursday) 21:29
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Better lense 35mm 1.4l versus 50mm 1.2l?

 
LonelyBoy
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Mar 05, 2017 17:54 |  #16

Elton Balch wrote in post #18292771 (external link)
Well, clearly, I'm no threat to "Bill Nye, the science guy"!!!

Here's an article which explained it in simple terms with a couple of visuals::-)

https://photographylif​e.com/what-is-focus-shift/ (external link)

:) I hope I didn't come across as harsh, but it seemed odd that you were saying you knew how it all worked and still didn't understand why it didn't happen at f/1.2 This site, by the way, is the one that made it click for me:

http://toothwalker.org​/optics/spherical.html (external link)


https://www.flickr.com​/photos/127590681@N03/ (external link)
I love a like, but feedback (including CC) is even better!

  
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Elton ­ Balch
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Mar 05, 2017 18:31 |  #17

LonelyBoy wrote in post #18292790 (external link)
:) I hope I didn't come across as harsh, but it seemed odd that you were saying you knew how it all worked and still didn't understand why it didn't happen at f/1.2 This site, by the way, is the one that made it click for me:

http://toothwalker.org​/optics/spherical.html (external link)

If I thought you were being harsh, I'd let you know :p. I'm just interested in an answer that helps me understand what's actually happening!


Elton Balch
5D Mark III, 7D Mark II, 24 mm f/1.4 L, 35 mm f/1.4 L, 50 mm f/1.2 L, 85 mm f/1.2 L, 100 mm f/2.8 macro, 135 mm f/2 L, 300 mm f/4 L, 16-35 f/4 L IS, 24-70 f/4 L IS, 24-105 f/4 L IS, 70-200 f/2.8 L IS II, 100-400 f/4.5-5.6 L IS ii, 580 EX Flash, Speedlight 600 EX RT, 1.4 extender, extension tubes and other stuff.

  
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CheshireCat
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Post edited over 2 years ago by CheshireCat. (2 edits in all)
     
Mar 06, 2017 00:13 |  #18

BigAl007 wrote in post #18292272 (external link)
How? Resolution is not, and never has been a variable in Depth of Field calculations. [...]

True, until the digital era.
Print size and view distance are losing their meaning in the digital era.
Most users don't print anymore.
Displays are bigger and bigger and much more true-to-reality than obsolete prints.
Folks now zoom-in 1:1 and get as close as they want to the display.

It's clear that sensors resolution and competing lens resolution are the only limitation.

So what does "depth of field" actually mean today ?

It's the depth of space where you get maximum resolution.
And maximum resolution is a function of lens aperture killing aberrations as much as required by a sensor element size.

.. and then there's diffraction... but that's a different story.


1Dx, 5D2 and some lenses

  
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Phoenixkh
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Mar 06, 2017 05:40 |  #19

And here I thought "focus breathing" was a Lamaze technique. <eg>


Kim (the male variety) Canon 1DX2 | 1D IV | 16-35 f/4 IS | 24-105 f/4 IS | 100L IS macro | 70-200mm f/2.8L IS II | 100-400Lii | 50 f/1.8 STM | Canon 1.4X III
RRS tripod and monopod | 580EXII | Cinch 1 & Loop 3 Special Edition | Editing Encouraged

  
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Zaphs
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Post edited over 2 years ago by Zaphs.
     
Mar 06, 2017 16:33 |  #20

I've had both - actually traded the 35 1.4 (of the Sigma kind, but I've NEVER had any focus issues) for the 50 1.2. The 35 was sharp, even 100% at 1.4 it would always amaze me how good it was. I sort of got bored with it, hence the trade.
The 50 is everything people across the internet report - misses, shifts, etc. It annoys me like no tomorrow, most of the time I'm on the verge of putting it up for sale. But then, once in a blue moon it happens - focus hits and THAT THING RENDERS LIKE NO OTHER.
Yes, I have a love-hate relationship with it :p


6D, 24-70/4L IS, 50/1.2L, 135/2L :3

  
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Better lense 35mm 1.4l versus 50mm 1.2l?
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