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Messages - funkboy

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EOS Bodies / Re: 5D MKIII ISO Test (Controlled Lighting - Studio)
« on: March 18, 2012, 12:04:45 PM »
First of all, thanks very much for posting this, stageshoot.  It looks like you've got a long way towards providing a controlled environment for your testing.  A few suggestions, if I may:

  • Clearly you've set out to provide examples of noise at various ISO settings, but it's difficult to judge noise performancealone without being able to also see detail retention.  Your images only seem to have about an inch of depth of field (focused on the rolls of thread) and thus don't have as many exposure zones for judgement of detail retention as they could.  Next time you may wish to stop down enough to make sure that the whole scene is in focus (I assume you're shooting this on a tripod with mirror lock-up to minimize vibration).  Arranging the props in such a way as to ensure that they're all in the same focal plane will make this easier.  Just don't overdo the stopping-down as e.g. f/22 will lower potential maximum resolution due to diffraction.
  • You might check the three-color histogram; it seems like you're blowing out the red channel on the magenta thread as there's significant loss of detail there.  This may be an issue of being almost blown in 14-bit RAW/prophoto color space & getting clipped when converting to jpg/srgb; using perceptual rendering intent when converting colorspaces may help if this is the case as color faithfulness to the subject is not of concern in this particular example.
  • It would be nice to have objects in the scene that provide the full range of exposure zones (all the way from solid black to solid white) in order to get an idea of performance across the full dynamic range capability of the camera.  The DPReview standard test scene is an extreme example of this, but it doesn't have to be anywhere near that complicated in order to be useful.

Thanks again for posting the test images, they're certainly interesting as shot already.

Site Information / Re: Karma is gone?
« on: March 18, 2012, 05:38:46 AM »
I think the tipping point may have been when EdMika got his first smite from a crazy adapter buyer.  He's doing a great service to EOS & FD shooters everywhere and the smite he got seems to have added to the disgust he had with the situation I believe he was 22/0 before that incident).

Site Information / Re: Karma is gone?
« on: March 17, 2012, 11:51:15 AM »
I failed to see the purpose in the smite, it seemed to add a negative spin to the forum. I am going to look into a "like" feature, as I think that would bring more positive discussion and reward the folks that have good ideas and points.

Smite is dead!  Thanks Craig!

A +1/like feature on comments would be welcome.

Site Information / Re: Karma is gone?
« on: March 17, 2012, 10:38:58 AM »
The forum host service installed an add-on a couple of weeks ago, and it apparently messed up several things in the background.  The add-on was just removed, but the removal resulted in several forum features being reset.  We'll see if karma gets turned back on...

Thanks for the info, Neuro.  Personally I thought the positive karma system was fine but use of the smite button was out of control :-).

Agree that the smite button needs to be done away with...  Positive karma is cool though.

EOS Bodies / Re: Canon 7Dmk2 any rumors??
« on: March 14, 2012, 05:54:17 AM »
...and yet another thread starts out interesting & descends into useless drivel after the first few pages...

Lenses / Re: Rumored 10 new lenses, 5 of which (CR) mentioned...
« on: March 11, 2012, 06:33:25 AM »
Due to popular user request, I think they should switch to a yearly cycle just like in software: 50mm/1.4/2011, 50mm/1.4/2012, ... so people will have plenty to rumor and discuss about. Or they could do it like car manufacturers: change the color, tweak the design of the af-mf button and so on :-p

Of course that would be nice, but how much do you think changing the design and tooling of all 60+ lenses in the lineup every year would add to the cost?  My guess is at least double...

Lenses / Re: Rumored 10 new lenses, 5 of which (CR) mentioned...
« on: March 11, 2012, 06:30:51 AM »
This shows where the 135mm f/2L MTF chart stands against the MTF chart of Canon's top performing prime the 400mm f/2.8L IS II. Two completely different lenses, of course, but it shows just how remarkable Canon's current lens technology is, and how much the 135 could be improved. In simplified terms... the higher the lines and the closer they track each other the better the quality of the lens.

Unfortunately, that's a bit of an oversimplification.

Here's the MTF chart for the 14mm f/2.8L II:

Does it mean that the 14L II is a hunk of junk compared to the 400L II?  Of course not.  It's one of the best 14mm SLR lenses available today.  Basically, MTF charts are very useful for comparing lenses of the same focal length, but comparing the 135L's MTF to the 400L II's is apples & oranges.

Luminous Landscape has a very good tutorial on reading MTF charts.

To quote Michael's article:

Keep in mind that the black lines show the lens wide open while the blue lines show the lens stopped down to f/8, so the closer these sets of lines are to each other the better the performance of the lens when used wide open. The very best lenses will have the black and the blue lines close together.

Generally speaking a lens whose thick lines (10 LP/mm) are above .8 on the chart should be regarded as having excellent image quality. Above .6 is regarded as "satisfactory". Below .6 is, well, below.

[...] The closer [the dotted meridonial and sagital] lines are to each other the more pleasing the bokeh of the lens. Fascinating, huh?

The meridonial and sagital lines are also used used to evaluate astigmatism and field curvature — subjects which are beyond the scope of this brief essay.

It's also worth mentioning that anything after the 16mm mark on the X-axis is irrelevant on APS-C cameras...

Lenses / Re: Rumored 10 new lenses, 5 of which (CR) mentioned...
« on: March 10, 2012, 05:15:56 AM »
The 85L's AF is slow because it's an f/1.2 telephoto with a huge hunk of glass to move around.  Not much getting around that; I don't think it'd be updated any time soon.

I'd love IS on my 135L, but otherwise it's hands down the best performing optic of Canon's older lineup.  Likely not a big seller for them though, so don't expect an update any time soon.

IS and an optical revision of the 85 f/1.8 would be brilliant.  Probably also the same price as the new 24 & 28...

But what's still sorely missing from the lineup is an under-$500 fast "normal" EF-s prime from this century, à la Nikon, Pentax, Sigma, Sony, 4/3, etc...

Oehling has sites in Germany and France.  Very professional folks & nice prices.

Lenses / Re: New Lenses Coming [CR3]
« on: March 09, 2012, 04:38:38 AM »
The pancake lens fits very well with Canon's line of thinking mentioned in this article (thanks Northlight :-)

"It's not a question of whether or not you have a mirror. There is a consumer need for good-quality cameras to be made smaller," Maeda said. "We will meet this need."

He denied this would be difficult without removing the internal mirror, adding that Canon had produced very small SLR cameras in the past.

Now, certainly part of what he was talking about was the G1 X, but there's certainly more to come...

EOS Bodies / APS-H mirror clearance of EF-S lenses
« on: March 09, 2012, 04:05:04 AM »
going back to a previous discussion if they made it say a 25MP APS-H that shot  say 5 or 6 FPS  in H mode and 10FPS in crop mode at 15MP and be able to use EF-S lenses accepting the vignette in H mode vs C mode
it would be totally awesome.

Don't hold your breath...  I'm pretty sure I remember a Chuck Westfall interview from a few years ago where he said that the Nikon-style "crop mode" wouldn't be possible due to mirror clearance of the rear element of EF-S lenses on cameras not designed for it.  If you think about it, when they designed EF-S in the first place they probably would have made every effort to maximize the benefits of the design by getting the rear element as close as possible to an APS-C mirror while guaranteeing 100% clearance.

Long ago I hacked the plastic ring off the back of a cheap used 18-55 like Bob Atkins did to get it to work on my 10D.  According to the measurements Bob mentions in the article the rear element just barely clears the mirror of the 10D, so in all likelyhood you can be pretty sure that an APS-H mirror would whack into it...

EOS Bodies / Re: Canon 7D Mark II specs wishlist.
« on: March 08, 2012, 04:19:41 AM »
Well, if Canon sticks with their current (& much-appreciated) theme of not giving a toss about the megapixel race and trying to make the best cameras possible, I think a 7DII would look something like this:

  • new backlit APS-C sensor bringing associated low-light performance improvements
  • as few MP as they think they can get away with, I'd imagine somewhere between 16 & 18
  • single digic 5+.  plenty of processing power and keeps costs down & battery life up
  • as many of the new features from the 5DIII that they can squeeze in - hopefully the reduced moiré video processing will reduce the need for a strong AA filter
  • I'd imagine a bump in existing fps in order to placate those lamenting the loss of the 1D series.  9-10fps @16-18mp is likely possible with digic5+, and a 10fps APS-C mirror/shutter should be a walk in the park for them after having built the 1DX.
  • this is just a wish, but improved viewfinder if possible (the current one is already 1.0x/100% but perhaps they could make it a little brighter/snappier...)
  • under $US 2k

Look for an announcement either at Photokina or early 2013.

If they go with the backlit sensor or otherwise improve low-light performance by a stop or more, the 7DII could likely be viewed as the logical successor to the 1DIV.

I don't think we'll see a non-Ciné APS-H EOS DSLR again.  It's pretty clear that Canon's APS-H fabrication unit has moved over to the Cinema EOS side of the house (brilliant move on Canon's part; APS-H is almost exactly the same size as Super 35 so repurposing the fabs shouldn't have taken much effort).

Here's a thought: what if one of the forthcoming "for mere mortals" Ciné cameras and the rumored mirrorless system are the same thing?  There's an awful lot of synergy between the features of those two markets...

EOS Bodies / Re: Canon 7Dmk2 any rumors??
« on: March 08, 2012, 03:40:36 AM »
Really though, this isn't that hard to predict. Too many people get caught up in what they want companies to do, instead of looking at what they are doing. An objective examination of Canon's recent actions points pretty clearly in this direction.

Agree wholeheartedly.

Hi Ed,

Sorry to hear about your troubles.  For my part, I stopped worrying about people randomly hitting the smite button long ago.

There are a few online payment processing facilities that I'd recommend over PayPal (just search for PayPal wall of shame to see why).  The most widely used one is probably Google Checkout.

American Express opened their Serve service last year, though I believe it's still only open to US residents.

Finally, there's a spiffy little credit card reader for tablets & phones called Square.  I haven't read enough into the inner workings of their app to see if they can also process online transactions or not.

Anyway, don't let one negative experience get you down.  The Internet certainly removes a layer of politeness from people vs. vocal communication.

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