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Messages - neuroanatomist

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6301
EOS Bodies - For Stills / Re: My next upgrade...
« on: January 20, 2013, 08:59:03 AM »
Hm... Yes... Gitzo. I will try that model out tomorrow. I haven't seen Really Right Stuff carried locally unfortunately.

You won't find RRS locally, unless you live in San Luis Obispo, CA - they don't use distributors.  But IMO, the RRS legs are a step up from Gitzo in terms of quality.  The Gitzo 1542T was mentioned, I think Gitzo dropped the ball on that one - they made the center column too long, so the legs don't fold over the ballhead (unlike the 1541T, and I guess they realized their error and released the 1544T, which is a clone of the 1541T).

FWIW, I just picked up RRS' "travel" tripod set, the TQC-14 and BH-30 LR.  The set is 3 lbs, the leg diameters are equivalent to the Gitzo 2-series legs, and while the weight rating of the TQC-14 is a conservative 25 lbs, I can swing my own weight from it...I wouldn't try that with a 1542T!

6302
EOS Bodies - For Stills / Re: Potential upgrade from 7D
« on: January 20, 2013, 08:03:21 AM »
... recently I've found myself cringing at the images taken using the 7D+15-85 combo in low light when it is necessary to bump the ISO up to 3200/4000.

You're using a really low quality lens.

 :o

I don't know that I've ever heard anyone describe the 15-85mm as a 'really low quality' lens.  In fact, it's an excellent lens.  A fast prime lets in more light, allowing lower ISO - but the tradeoff is shallow DoF, maybe too shallow for the image required.

6303
No surprise there.  But just want to point out, this is a DxO-like conclusion.  You used a 5DII for the test, I can say from experience that in many situations, the APS-C sensor in my 7D delivered sharper pictures than my 5DII, by virtue of its better AF system.

6304
EOS-M / Re: Micro four DoF and lenses
« on: January 19, 2013, 07:54:31 PM »
What is an opstacle to make it 0.6 or 0.7?

Physics. 

The fastest lens, AFAIK, is the Zeiss Planar 50mm f/0.7.  They made only 10, and the cost was astronomical - literally: NASA bought six for the Apollo lunar program.  Stanley Kubrick bought three for candlelit filmmaking (Barry Lyndon), and Zeiss kept the last one - they've displayed it at Photokina.

6305
Speedlites, Printers, Accessories / Re: 600 rt set up question
« on: January 19, 2013, 06:54:33 PM »
The 5DIII focuses very well in low light without an AF assist lamp.  Unless you also want an on-camera flash, I'd go with the ST-E3-RT.  I would have, except I often need to trigger a monolight as well, so I'm sticking with PocketWizard for now.

6306
EOS Bodies - For Stills / Re: ISO 50
« on: January 19, 2013, 03:55:52 PM »
Exactly.  There's no real benefit to ISO 50, except perhaps convenience if you're shooting in Av mode and want a stop slower shutter speed.  But if a highlight would be blown at ISO 100 with a given aperture/shutter combo, it'll be just as blown at ISO 50.

Let's say I have a "right exposed" image at ISO 100, and I go down to ISO 50 in AV mode.  Shutter speed doubles.  If the sensor was acting as if at ISO 100, it would saturate at the longer exposure and I would get blown out highlights at 50 (maybe more towards gray than white), but not at 100.  I'm not entirely convinced this is how it works.  I wish I knew where and how the expansion is executed in the camera.

Expanded ISO means digital gain (negative gain for ISO 50).  The exposure is at ISO 100, then pulled down a stop.  In your example, you'd lose the highlights.

6307
EOS Bodies - For Stills / Re: ISO 50
« on: January 19, 2013, 01:29:07 PM »
There's a reason ISO 50 needs to be unlocked to be used. It's not actually ISO 50. It's ISO 100 being reduced in camera to ISO 50. The same as shooting ISO 100 and then in post bringing the exposure down a stop. I would never shoot with it.

Exactly.  There's no real benefit to ISO 50, except perhaps convenience if you're shooting in Av mode and want a stop slower shutter speed.  But if a highlight would be blown at ISO 100 with a given aperture/shutter combo, it'll be just as blown at ISO 50.

6308
Lighting / Re: The Flash Bracket? Do they really matter anymore?
« on: January 19, 2013, 12:54:25 PM »
They're also capable of carry double flash assemblies for macro work. ;)

True...although for macro flash, I actually prefer the extra flexibility of the Wimberley F-2.

6309
Lenses / Re: Dust Donut - Add Weather Sealing to Any Lens
« on: January 19, 2013, 12:23:57 PM »
Having had a look at it, I don't think it is intentionally misleading. It does state they're only adding a seal between the lens and mount, and talks in that context.

Much of the time, yes. But many statements make much broader claims - and many people will notice those more so than the accurate claims. Just look at what the OP chose to title this topic: "Dust Donut - Add Weather Sealing to Any Lens" - not, Dust Donut - Add Weather Sealing to Any Lens MOUNT.

6310
Lighting / Re: The Flash Bracket? Do they really matter anymore?
« on: January 19, 2013, 12:00:25 PM »
but why not just use a TTL cable and hold the flash in proper orientation rather than carry a bulky and heavy bracket?

Well, I have only two hands. Maybe you have more, in which case that sounds like a good idea.  ;)

6311
EOS Bodies - For Stills / Re: 1DX import issues (not my camera)
« on: January 18, 2013, 05:06:25 PM »
Corrupt memory card seems like a good possibility...

6312
Lenses / Re: Dust Donut - Add Weather Sealing to Any Lens
« on: January 18, 2013, 12:25:56 PM »
I think the problem is in the sensational tone of the ad.

"Now Photographers everywhere can take full advantage of Canon's non Weather Resistant lenses and even the more affordable third party lenses while still benefiting from the increased durability of a Dust and Moisture resistant Camera/Lens combination!"

"just use your lens as usual but with the added peace of mind that both of your investments are protected against Dust and Moisture."


This is exactly my point - claims like this are misleading, at best.  It's like going outside in subzero temperatures wearing a super-warm, cold-proof glove.  Your hand will be perfectly protected, but you'll still freeze your ass off...   ::)

6313
EOS Bodies - For Stills / Re: Canon EOS-1D X Technical Report
« on: January 18, 2013, 12:21:55 PM »
Any update on this subject?

It's not supported at this point, although the only problem it causes is with metering (physically, it fits).  Chuck Westfall told me that it's apparently something Canon could fix in firmware, if they choose to.

6314
Do tell: Did you do the swinging thing? Or your kids?
Really cool stuff

I started to try it with the Manfrotto 190CXPRO4, with just a fraction of my weight the legs started bowing inward alarmingly, I stopped immediately.  As soon as I unpacked the TQC-14, I tried it.  :)  Almost no flex when supporting my weight. 

6315
Guess you better get yourself a Nikon body, and spend time on your knees praying for Nikon to release those lenses. 

What is the point of this post, anyway?  Oh wait, now I remember - you're the guy that Canon screwed over.  I guess it's happening again, with Canon not releasing lenses specifically for you.  Boo hoo.   :'(

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