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Messages - Autocall

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17
Lenses / Re: Patent: Canon EF 2.8x Teleconverter
« on: March 27, 2012, 11:33:57 AM »
<p><strong>Canon’s patent</strong></p>
<li>When doubled, twice the lateral aberration, longitudinal aberration is 4 times greater rate of expansion, because the F-number is also double, longitudinal aberration is twice per depth of focus</li>

I read that as it, like the 2X, adds two stops. So a 2.8 lens -> 5.6, not 8.

you've read wrong: you loose 2 stops with the 1.4 converter, and tree stops with the 2.0 .
this means 4 stops with the 2.8

I'm sorry you're not right - you loose 1 stop with 1.4 and two stops with 2.0. Assume you have 400mm f4. It means a hole is 100mm wide (400/100). If you add 1.4 TC, you have 560mm. So it becomes 560/100 = f5.6 and  f4 -> f5.6 = 1 stop. Calculate it with TC 2.0 and TC2.8 accordingly and you will find it.

yeap, you're right.
sorry

I love how you fight about "stops" dudes ... bit of a clue : take F/2,8 or F/4,0 or whatever indeed and just multiply by the number on the extender ... magic ;)

Wow, how did you do that? That's really a case for Penn & Teller

apart from the relatively simple ratios, I was concerned by the loss due to the additional elements.
( a polarizing filter doesn't change the focal but causes 1 full stop loss for example)

18
Lenses / Re: Patent: Canon EF 2.8x Teleconverter
« on: March 27, 2012, 10:59:32 AM »
<p><strong>Canon’s patent</strong></p>
<li>When doubled, twice the lateral aberration, longitudinal aberration is 4 times greater rate of expansion, because the F-number is also double, longitudinal aberration is twice per depth of focus</li>

I read that as it, like the 2X, adds two stops. So a 2.8 lens -> 5.6, not 8.

you've read wrong: you loose 2 stops with the 1.4 converter, and tree stops with the 2.0 .
this means 4 stops with the 2.8

I'm sorry you're not right - you loose 1 stop with 1.4 and two stops with 2.0. Assume you have 400mm f4. It means a hole is 100mm wide (400/100). If you add 1.4 TC, you have 560mm. So it becomes 560/100 = f5.6 and  f4 -> f5.6 = 1 stop. Calculate it with TC 2.0 and TC2.8 accordingly and you will find it.

yeap, you're right.
sorry

19
Lenses / Re: Patent: Canon EF 2.8x Teleconverter
« on: March 27, 2012, 10:39:13 AM »
<p><strong>Canon’s patent</strong></p>
<li>When doubled, twice the lateral aberration, longitudinal aberration is 4 times greater rate of expansion, because the F-number is also double, longitudinal aberration is twice per depth of focus</li>

I read that as it, like the 2X, adds two stops. So a 2.8 lens -> 5.6, not 8.

you've read wrong: you loose 2 stops with the 1.4 converter, and tree stops with the 2.0 .
this means 4 stops with the 2.8

20
C. Fn 2, Custom Controls, set the first option (shutter button) to either "Metering Start" or "AE Lock".

This was among the very first things I did to the 5D3 when it arrived. The whole point of back-button focus is to separate the focusing from the shutter activation. The AE Lock (on shutter half-press) is handy when shooting Av/Tv because you can focus on one point, meter on another, recompose, and activate the shutter independently. Total control.

Edit:  I just saw how Canon chose to abbreviate the setting name.. "Shutter Butt. half-press". Really, Canon? There's no other way to abbreviate "button"?

wow! +5 karma


21
EOS Bodies - For Stills / Re: Defective 5D MK III.....
« on: March 22, 2012, 04:54:55 PM »
are you aware that you should first press the shutter button halfway before pushing it down completely?
jpeg samples, png savings,
come on...

22
Still be people not shooting panoramics for wide landscapes?
I understand that high-end Studio photography eventually still needs medium format but why the hell wouldn't the mk III be suited for landscapes?

23
Lenses / Re: Canon 50/1.4 focusing
« on: March 06, 2012, 04:33:26 AM »
here is an extract of the best review of this lens in my op.
hope it helps
Although it is soft wide open, the Canon EF 50mm f/1.4 USM Lens is sharp at f/2 and very sharp when stopped down to f/2.8 or narrower. Corners are soft until f/2 for 1.6x FOVCF bodies and f/2.8 on full frame bodies. Strong halation is present at f/1.4 (a soft, dreamy look) with some CA (Chromatic Aberration). Colors and contrast (after the halation diminishes at f/2 or so) are very nice. The 50 f/1.4's 8-blade aperture creates a good foreground/background blur quality. Light fall-off is noticeable through f/2 on a Full Frame body, When mounted on a 1.6x FOVCF body, light fall-off is noticeable only through f/1.6 or so. My exposures with this lens run about 1/3 stop brighter than with most of my other lenses.  

from
http://www.the-digital-picture.com/Reviews/Canon-EF-50mm-f-1.4-USM-Lens-Review.aspx

24
EOS Bodies / Re: Introducing the Canon 5D Mark III
« on: March 02, 2012, 05:56:15 AM »
Very happy after several years of waiting but why did they not put in a rotating back display??????

fortunately not!
thank God...

25
New generation Eye-controlled Autofocus

26
EOS Bodies / Re: 5D Mark III Full Spec List?
« on: March 01, 2012, 08:42:54 AM »
Anybody noted the mention INTELLIGENT viewfinder?
THIS is the groundbreaking feature that will shake the industry that they were talking about.
I know that this is not a inedited technology but I bet that i will have nothing to do with what have been done in the past!!
The optical TTL focus IS the feature that will hurt Nikon the most.
Buy shares now....

27
EOS Bodies / Re: NO 5dM3 On Friday * CONFIRMED By a canon Rep Today
« on: February 29, 2012, 05:52:56 AM »
according to this video and cr guy , it seems they are pretty confident about the 5D3 release..lets wait 2 more days ..

http://www.phototips.biz/2012/02/phototips-canonrumors-live-cast.html


from the website -
"..I believe their will be a special feature of this camera that has the potential to change our industry.."  :o :o :o


EYE-CONTROLED FOCUS.
who wants to bet?

28
Je vous confirme que Vendredi 2 Mars Canon fera son annonce du nouveau 5DMKIII

Quelques caractéristiques:

22 Millions de Pixels
6 images /sec
Batterie LP-E6
Nouvel AF plus rapide
Diverses améliorations dans la video

Prix: +/- 3250 €

From Baylyns (founder) on:

http://www.eos-numerique.com/forums/f11/canon-google-page-ranking-sentera-son-eos-5dmkiii-le-196481/

transl:
I confirm that Friday, March 2 Canon will make his announcement of the new 5DMKIII

 Some features:

 22 Million Pixels
 6 frames / sec
 Battery LP-E6
 New AF faster
 Various improvements in the video

 Price: + / - 3250 €

29
EOS Bodies / Re: The Next 5D on February 27/28, 2012 [CR3]
« on: February 25, 2012, 11:34:50 AM »
absolutely NO mention is made about the sensor' size in the specs.
Could very well be the 7D II.
Anyone think the same?

absolutely NO mention of it being a camera in the specs.   Could very well be a waffle maker.
Anyone think the same?

canadian or belgian?
 :o

30
EOS Bodies / Re: The Next 5D on February 27/28, 2012 [CR3]
« on: February 24, 2012, 07:43:23 AM »
absolutely NO mention is made about the sensor' size in the specs.
Could very well be the 7D II.
Anyone think the same?

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