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Messages - neuroanatomist

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Lenses / Re: B+W XS Pro MRC UV (010P) NANO Slim filter for my 85L or 135L
« on: December 13, 2012, 07:39:48 AM »
The XS-Pro is great. Yes, it has front threads so the standard cap can mount (there's a slight gap around the edge, there is one anyway with a regular filter, but a little more with the XS-Pro - not an issue in use).

But...there's no need for a slim mount on the 85L II. You can actually stack two F-Pro filters on the lens with no increase in vignetting, and even a third F-Pro only causes a tiny increase in optical vignetting (less than 1/8-stop).

EOS Bodies - For Stills / Re: Crop vs FF for landscape photography
« on: December 13, 2012, 06:54:34 AM »
But note that the only canon crop body to offer AFMA is the 7D...

...and the 50D (yet another way in which the 60D was not an upgrade, and consumers were pushed to the 7D, similar to how the 6D is not an upgrade to the 5DII, but I digress).  Oh, and the 1DIII and 1DIV...1.3x is a crop sensor, too.   ;)

Canon General / Re: Record Spending Into Camera Gear - HIGHEST
« on: December 13, 2012, 06:45:46 AM »
If someone spend a lot of money for a 5D Mark III with the EF 24-70 2.8 II lens for private use than it´s a very big investment compared to my investment for professional use.

True...it's all relative.  I spend a lot on camera gear for personal use, but the sum total of all my camera gear is less than the cost of the microscope in my office...and that one is cheap compared the scopes in my labs (even the cameras attached to them cost $10-$20K each, and some scopes have up to 4 cameras mounted).  A few thousand in camera gear at home...a few million in optical gear for professional use.  All relative.

EOS Bodies - For Stills / Re: Crop vs FF for landscape photography
« on: December 13, 2012, 12:32:02 AM »
Your three mistakes are as follows:

* Zooming the lens. This is likely inconsequential with these lenses, but it is a mistake none the less.

* Equivalent processing. This is a huge mistake which invalidates your test and your results out right. You do not use identical processing with different sensors, even different sensors of the same format.

* You do not mention if the shots were unlabeled. If your wife knew which came from which before picking, the results are less than worthless, they are misleading. There is no shortage of examples of conscious and subconscious human bias, of people picking what they think they should pick. It's just what we do. Even if they were unlabeled, a strict scientist would discount your results because you knew, and there's no shortage of ways you could have consciously or subconsciously telegraphed the "correct" choice to her.

Actually, those are your three mistaken assumptions.

* Zooming is necessary.  Cropping to match FoV negates the purpose of the test, and moving the camera changes the perspective of the image, i.e. the size relationships of various elements - kind of important to a picture.  What viable alternative would you suggest?

* I stated 'equivalent' - thinking that I meant 'identical' is a huge mistaken assumption.  Equivalent means processed in such a way as to extract maximum detail with minimum noise, correct color as appropriate, etc.  Obviously, that means different processing for different sensors.  The idea was to make both images as good as they could be, not to stack the deck against the 7D. 

* Did I have to mention that? Really? What do you think, that I said, "Sweetheart, the first image in each pair is from my new, top-of-the-line camera, my favorite camera in the world, the second is from the old piece of crap camera that I'm going to give to our 3 year old as a toy...now tell me which ones you like better, wink-wink, nudge-nudge?"  The fact that you even considered something like that, much less labeled it a mistake that I made, is actually pretty damn offensive.  In fact, I watermarked a '+' or a 'o' on each image, each label was randomly assigned to one of the pair, but balanced so there were the same number of each label in total, and I set up a looping slideshow that she looked at when I wasn't in the room.  Before you go to the next level and suggest she peeked at the EXIF, if she did I bet she'd have picked the 7D because 7 is a bigger number than 1. She likes my pictures, supports my hobby, and doesn't give a darn about the gear itself.  But being a Professor of Anatomy, she does have a keen eye for detail in the images.

FWIW, I am a card-carrying 'strict scientist', PhD and a day job in the field (including responsibility for some bioanalytical assays conducted under GLP conditions), and once upon a time I actually conducted neuropsychological testing.  I explicitly stated the above was subjective and completely anecdotal.  You seem to have truncated your quote of my post right before that statement. 

Given your evident bias and unsupported assumptions in calling out my 'mistakes' I don't see any point in pursuing this discussion further.

For example, the minimum focus distance is the same for a given lens whether you're full frame or crop, so the mfd for a given effective focal length is generally smaller for a crop (to put it another way, at magnification of 1x, an object 36mm wide fills a ff sensor, but an object 22.5mm wide fills an APS-C)

You usually have to stop down a long way to get enough dof with macro, so the extra dof in APS is a plus.

That's having your cake and eating it, too.  The 'deeper DoF of APS-C' applies when you're talking about identical framing, meaning a greater subject distance with APS-C.  When you're comparing APS-C to FF at 1:1, the APS-C frames a smaller subject and gives a shallower DoF - that's two advantages to FF, right there.  On the flip side, APS-C gives you relatively more pixels on that smaller FoV, meaning more 'digital' magnification - so that's an APS-C advantage.

Canon General / Re: Record Spending Into Camera Gear - HIGHEST
« on: December 12, 2012, 11:29:42 PM »
neuro... I think I've asked this before but again, what is your quick opinion of the 28-300?  Should I get one?  (Journalistic shooting style, outdoor campouts, summer camp, etc.)  Of course if you say yes and I get one, you are fully responsible for all my mistakes and resulting pictures, good or bad.  It's all on you dude!!   :P  Seriously, what is that's lens' primary use for you and how do you like the push-pull, etc?  Any standout issues, good or bad?  Are you glad you bought it for your intended purpose?  Thanks.

It's a useful lens. I use it for travel, outings with kids, etc. optically equivalent to the 24-105L (very good, but not stellar), weather-sealed, I like the push-pull (have the 100-400, too).  FWIW, that's the only lens on the above list that I bought used, and I got a good enough deal that I could sell it for a modest profit if I find myself using it only infrequently.

EOS Bodies / Re: Are you really serious about 6D?
« on: December 12, 2012, 11:13:06 PM »
As for those Canon shooters who are stuck with inferior sensors.... good luck, buddy.

Yep, most of Reuters, the official White House photographer, and the general public in numbers far greater than any other dSLR manufacturer.  Poor bastards.

I have some difficulty understanding your point with this.

It's pretty clear this is your basic trolling post, and a rather unimaginative one, at that.

EOS Bodies / Re: 6D vs 5Diii vs 5Dii - Speedlite AF Focus Beam Assist Tests
« on: December 12, 2012, 11:08:16 PM »
...i have found the focus speed to vary depending on ... aperture used, and which AF mode I'm in.  Using either of my primes wide open, with single point AF the lag is much more noticable.  But, at f2.8-4 losck is achieved much quicker.

If true, that's certainly a firmware design choice by Canon.  AF is always done wide open, regardless of the selected aperture.  It's possible that Canon elected to trade speed for accuracy when a narrower aperture is selected and the tolerance for slight AF errors is higher.

EOS Bodies / Re: Are you really serious about 6D?
« on: December 12, 2012, 09:44:56 PM »
Canon, you are not getting a dime of my money on your recent cameras.

I'm sure they'll be crying all the way to the bank, as 60D and Rebel shooters, attracted by the allure of FF and by the 'affordable' price, coupled with consumer-oriented features like GPS, WiFi, and an SD card slot, buy up 6D's left and right.

Lenses / Re: Canon 100mm F2.8L IS
« on: December 12, 2012, 09:19:15 PM »
Mine shows up as 100mm in Aperture, MacOS, etc., with Exiftool, and after upload to Flickr.  Sounds like a bug in LR.

EOS Bodies - For Stills / Re: Crop vs FF for landscape photography
« on: December 12, 2012, 08:59:35 PM »
Pn the flip side, contrary to the many claims you will hear, right now in the Canon lineup a 36x24 sensor is also not more useful for landscape photography UNLESS you own and use the T/S wide angle lenses. You will hear all day long how FF offers better image quality at low ISO. It does not, and you can demonstrate this all day long by presenting unlabeled large prints from both (or pixel crops online) and watch while FF fans stumble trying to guess which is which. They never can.

Who is 'they'?   Here's what I can tell you.  I took a series of paired, identically framed shots shots with the 7D and 1D X, using either the 24-105L or the 70-200/2.8L IS II, using the zoom to compensate for the effect sensor size on FoV (meaning same distance, so same framing and same perspective for each pair).  I shot about a dozen paired images like that, some landscapes, some architecture, and a couple of close-up flower/plant shots with the 24-105. I processed them equivalently, then showed the paired images to my wife, scaled down to 3.7 MP (full screen on an Apple Thunderbolt Display), and asked her which she liked better.  For 11 of the 12 shots, she picked the 1D X image.  Subjective and completely anecdotal? Yes. But subjectively and anecdotally, at least, the 'FF mystique' is real.

Canon General / Re: Record Spending Into Camera Gear - HIGHEST
« on: December 12, 2012, 08:28:16 PM »
2012, bought: 28-300L, 1D X, 600/4L IS II, both MkIII extenders, 600EX-RT, and $4.5K worth of RRS support gear.  I'm not going to do the math.  ;)

Software & Accessories / Re: GPS Receiver GP-E2 tagging RAW files
« on: December 12, 2012, 07:53:59 PM »
Yes, it will automatically tag RAW files when mounted in the hotshoe.

Lenses / Re: Help me choose: EF lens for 60D
« on: December 12, 2012, 06:27:40 PM »
Ummm...yeah, what I said.   :P   ;D

No.  Other functions can be assigned to the DoF Preview button, but the DoF Preview function cannot be assigned to any other button.

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