April 23, 2014, 05:17:22 AM

Recent Posts

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51
EOS Bodies / Re: Petition to Canon regarding the EOS 5D Mark III
« Last post by 3kramd5 on April 22, 2014, 10:57:18 PM »
Regarding AF point-linked spot metering for the 5DIII, while the AF systems are nearly the same as you state, the metering systems are vastly different.  Here are the 61 AF points superimposed on the 5DIII's 63 zone iFCL metering grid:



The resolution of the 5DIII's metering sensor simply may not be high enough to support spot metering with the AF points, whereas the 100,000 pixel metering sensor of the 1D X can do so.  Even when the 1D X's metering sensor reverts to zone metering (in very dim light or for flash exposure metering), it's divided into 252 zones - 4 times the density of the 5DIII's metering sensor.

I can't say for sure that those tecnhical limitations are absolute, but you might consider the possibility that there are technical reasons for those features being available on the 1D X but not on the 5DIII.  After all, they did add f/8 AF to the 5DIII.


How dare you suggest there is a fundamental reason that the 5D3 and 1Dx don't operate the same way? :P

Personally, I imagine that if the spot meter works at the center, one could use whichever of the 63 segments corresponds to the AF point in question. Given how large the AF sensors are relative to the total frame, in all likelihood each AF point falls on multiple segments with the 5D; and it's almost certainly the case with the 1Dx. I would guess that the 1Dx uses an average reading of all the appropriate segments rather than a single segment. Given the size of the spot meter indicator in the VF, I further guess that the center spot metering uses multiple readings.

The 5D3 could probably do the same thing, but it may negatively affect performance given the substantially lower processing power relative to the 1Dx.
52
Software & Accessories / Re: Fail to contact support Reikan (Focal)
« Last post by Canon1 on April 22, 2014, 10:46:15 PM »
I've been watching this thread as I was ready to buy the Pro version. I will continue to watch and not buy until I see positive outcomes.

I've been using focal for years now. Have the latest version and it works perfectly. No complaints on my end... And there are many many users with the same good experience.  It's a bummer that there are some with bad experiences... But I don't think it is the norm.
53
Lenses / Re: Review: Sigma 50mm f/1.4 DG HSM Art Lens
« Last post by skullyspice on April 22, 2014, 10:44:24 PM »
sounds like a dud. i'll stick with the 1.2
54
Animal Kingdom / Re: BIRD IN FLIGHT ONLY -- share your BIF photos here
« Last post by 2n10 on April 22, 2014, 10:43:12 PM »
Nice series 2n10 ;)

Just ordered my Wimberley II. Can't wait... ::)
 
Barn Swallow




Thank you.  Having not used a Wimberly I can not figure out how to follow a swallow with it even though I understand its operation.  I would be beating the heck out of my self with the tripod.  ;D
55
Animal Kingdom / Re: BIRD IN FLIGHT ONLY -- share your BIF photos here
« Last post by 2n10 on April 22, 2014, 10:40:53 PM »
I really like the Barn Swallow.  8)

+1, it's not easy to get those fast little blighters, and it was done very nicely.

Thank you Click.

Alan, it was the only one that the focus was solid out of about 50.  Some would be fine at a larger size but could not be cropped to this size.  Thank you Alan.

Yes, swallows are amongst the hardest birds of all to catch in flight. Well done!
Thank you scyrene.
56
Lenses / Re: Review: Sigma 50mm f/1.4 DG HSM Art Lens
« Last post by Invertalon on April 22, 2014, 10:39:29 PM »
I just tried my 4th... Yes, 4th copy of the Sigma 35... I have written Sigma off at this point. I tried, but I just could not deal with the AF.

The first two I tried right when the lens came out... MA changed heavily indoors vs. outdoors... 0 MA near to far outdoors, +10 required indoors. Was a PITA.

Fast forward to last week, I tried another. Copy 1 seemed to work fine indoors vs. outdoors but was decentered... OK, just get another... I have had plenty of Canon lenses that I needed to exchange.

Got the replacement, indoors to outdoors is perfectly fine (thankfully). However, the AF is just way too darn unreliable. Some shots are so far OOF you wonder how the camera ever thought it was right. Yet the next photo be perfectly sharp, the next somewhat soft, sharp again, way out of focus the next, etc... Mostly near infinity focus it had these issues.

I just slapped my 35L back on and sent the Sigma back home for the last time... Until Sigma can have even better AF, the Canon options are for me.
57
Photography Technique / Re: How (and Why) I Took the Shot #3: Inferno
« Last post by Ripley on April 22, 2014, 10:38:46 PM »
There appears to be a plastic bottle or bag in the water just above the rock in the center. Regardless of what it is, I would remove it along with a few other articles of debris to clean up the close end of the foreground a bit. Just a suggestion...

Nice shot.
58
Lenses / Re: Review: Sigma 50mm f/1.4 DG HSM Art Lens
« Last post by LetTheRightLensIn on April 22, 2014, 10:33:10 PM »
"occasional AF inconsistency"

Noooooooooooooooooooooo!!  This is why I retuned all of the copies of their old 50mm...  Hopefully the Sigma dock can fix this.

Otherwise the review looks great.  My biggest concern with this lens was if it sacrificed a nice smooth OOF for sharpness.  The few "Bokeh" (I never know if I am using that word correctly) pictures I have seen look good though.

Man what is it with 50mms?? Why can they never AF? Zeiss 50mm new or old or older don't AF. Canon 50mm 1.4 and 1.8 don't AF (1.2L maybe does if you escape focus shift). Old sigma doesn't new sigma doesn't. Zuiko doesn't AF.
59
EOS Bodies / Re: Petition to Canon regarding the EOS 5D Mark III
« Last post by neuroanatomist on April 22, 2014, 10:29:52 PM »
Have you tried using AI servo in low light?  Wouldn't it have been nice to have your AF point illuminated in red so you can actually see what your focussing on?  Without the illuminated AF points, AI servo would be crippled in low light for me.

There's no reason why this feature shouldn't trickle down to the 5D, or spot metering tied to AF points given the fact they share nearly identical AF systems.

You sound quite certain about that…I'm not so sure. 

For AF point illumination in AI Servo, as I understand the issue, the problem is that the the light which illuminates the AF points also affects metering.  In prior 1-series bodies, the illumination wasn't an issue, since the light was at a different angle to illuminate the AF points etched in the focus screen, compared to the points displayed on the transmissive LCD.   It's not a problem in One Shot, as metering is done once.  But in AI Servo, metering is done continuously, along with AF.  The solution for the 1D X required that the illumination blink on and off, but I also suspect it may involve altering the way the data is read from the metering sensor, so the data from the red channel are eiher ignored or given less weight.  That would be possible with the RGB metering sensor of the 1D X, the 5DIII doesn't have an RGB metering sensor. 

Regarding AF point-linked spot metering for the 5DIII, while the AF systems are nearly the same as you state, the metering systems are vastly different.  Here are the 61 AF points superimposed on the 5DIII's 63 zone iFCL metering grid:



The resolution of the 5DIII's metering sensor simply may not be high enough to support spot metering with the AF points, whereas the 100,000 pixel metering sensor of the 1D X can do so.  Even when the 1D X's metering sensor reverts to zone metering (in very dim light or for flash exposure metering), it's divided into 252 zones - 4 times the density of the 5DIII's metering sensor.

I can't say for sure that those tecnhical limitations are absolute, but you might consider the possibility that there are technical reasons for those features being available on the 1D X but not on the 5DIII.  After all, they did add f/8 AF to the 5DIII. 
60
...Scratch that theory, just shot with my buddy's 70-200 II which is less than a month old and it does not record serial numbers either in bridge.  Oh well!
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