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Messages - neuroanatomist

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Technical Support / Re: 10 Stop ND Filter - Metering
« on: May 03, 2013, 11:23:34 AM »
As Mt. Spokane pointed out in another thread, there's more to a filter than the glass. B+W use brass mount rings which are less likely to bind up than the aluminum rings most other brands use - since I often stack a CPL on an ND, not getting my filters stuck together is an important consideration for me.

Awesome, thanks! I wasn't aware of this option on the 1D X.  4 min is probably too long for me, but 30 s to 1 min might work. 

I think this is mainly made-up to cut into the sales of 3rd party lensmakers.

3rd party lenses 'borrow' lens codes from old Canon lenses. In some cases, this has caused problems - for example, off-center AF points not working properly on 40/50/60D and 7D bodies for many Tamron lenses.  Of course, Canon lenses were affected, too...which probably annoyed the 4-5 people using a 20 year old 35-80mm zoom lens on a recent dSLR.  ;)

Lenses / Re: Tripod collar on the 300, 400 & 500 f2.8's
« on: May 03, 2013, 09:33:56 AM »
No, it's not. The foot can be removed from the collar, though (4 screws).

There's a 500/2.8?!?   :P

Technical Support / Re: 10 Stop ND Filter - Metering
« on: May 03, 2013, 09:32:13 AM »
Yes, the metering sensor is above/behind the pentaprism, when the mirror is up it gets no light.  Incidentally, that's also why the red AF point illumination for the 5DIII/1D X causes a problem in AI Servo - that red light in the VF affects the metering sensor (the fix in the 1D X was to make the AF point illumination 'blink' and the metering is done when the red light blinks off).

I have B+W/Schneider 10-stop NDs, they're good but not true neutral, they have a warm tone.

Third Party Manufacturers / Re: Sony 400/4 telephoto on the way....
« on: May 03, 2013, 09:24:31 AM »
Said to be "affordable for amateurs".

Absolutely no sign of a new 400/4 coming from Canon ie a scaled up version of the superlative 300/2.8 II would be just fine - very little R&D required!. With slightly smaller aperture it would be slightly lighter and approx same price.

So, is the contention is that a ~$6K lens would be "affordable for amateurs"?  Or will the Sony lens just be a lot cheaper? If so, how? A 400/4 will need a 100mm front element just like a 200/2. Will they change the laws of physics (or economics)?  Make the elements out of plastic?  I just can't see a 400/4 being "affordable". Or maybe they'll take a page from the Pentax book and label the lens with a 'crop factor adjusted' focal length, i.e. try to market a 267mm f/4 lens for APS-C as a real 400mm lens, or maybe a 200/4 for their NEX cameras.  ::)

Technical Support / Re: 10 Stop ND Filter - Metering
« on: May 03, 2013, 09:11:41 AM »
Because the 10-stop ND does not allow sufficient light for the metering sensor to work, whereas Live View is using the more sensitive CMOS image sensor for metering data.

FWIW, I usually compose, meter and focus before putting the 10-stop on, then just adjust the exposure by 10 stops.

So the IQ of Nikon lenses ends up being this enigma with no definition outside the usual comments.

There are lots of tests of many lenses - photozone, SLRgear, DPReview, etc. all test both Canon and Nikon lenses. There's no mystery-wrapped enigma, in general (although there are obviously exceptions) where both have a similar lens, the IQ of the Canon lens is better.

Now, if you specifically mean the supertele lenses, there aren't many tests of those from either brand.  What tests there are favor Canon, which given their advantage at shorter focal lengths, use of fluorite elements, etc., makes logical sense.

Who knows - maybe the Nikon camp is running the tests, but are too embarrassed to publish the data...  :P  (kidding)

Lenses / Re: GND Filter Recommendation
« on: May 03, 2013, 08:32:02 AM »
Graduated ND filters?  Don't get the screw-in ones, you have no flexibility in where the line goes - it's always in the middle, and that's rarely where you want it for composition.

Get a Lee Foundation Kit and 82mm WA adapter ring (or a Cokin Z holder), and some Lee or Singh-Ray 4x6" grads.

EOS Bodies - For Stills / Re: 5dmk3 shoot burst w/10 second delay?
« on: May 03, 2013, 08:09:31 AM »
If you don't mind normalizing a set of slightly different exposures in post, you can take a bracket exposure series by 1/3 EV increments.  Use Live View and the 10s timer, and the series of bracketed exposures will be taken at max fps.

Yep - that's dust on the sensor. My 1D X came with several of those.  I use an Arctic Butterfly 728 Super Bright.

Lenses / Re: Canon 85L II AF speed on 5D III???
« on: May 02, 2013, 10:24:41 PM »
Thanks - you learn something new every day!  One more reason to love back button AF...

Lenses / Re: 600mm lens
« on: May 02, 2013, 07:22:30 PM »
I use the RRS foot, for the reasons described in this post.  I honestly have no idea if the lens will fit in the Canon case with the RRS foot attached - I don't use the Canon case at all. 

For carrying the lens to the field, I use the Lowepro Lens Trekker 600 AW II discussed above. It holds the lens with a 2x TC and 1D X mounted, has a tripod holder for my RRS TVC-33, and Sliplock attachments for lens cases, the Lowepro Lens Exchange 200 AW in which I carry my RRS PG-02 LLR gimbal head, etc.  FWIW, the Lowepro Flipside 500 AW will hold the 600 II (no body attached), and it is airline carrying size.

For storage at home, I want something waterproof - the Canon case is not.  Roofs leak, pipes burst, etc.  I keep my 600 II (with the hood reversed and foot on) in a Storm im2720 hard case, along with other gear:

I did use Loctite on the threads of the 4 screws when I replaced the Canon foot with the RRS foot (the Blue 242 type, so I can remove them if needed).

Lenses / Re: Canon 85L II AF speed on 5D III???
« on: May 02, 2013, 05:52:02 PM »
Just confirmed - camera off, mounted the 85L II (set to AF), powered camera on, touched no buttons/dials/etc., and as soon as the self-clean finished, rotating the focus ring extended the front element.

Lenses / Re: Canon 85L II AF speed on 5D III???
« on: May 02, 2013, 03:28:44 PM »
It's in one of the AF menus, second or third, I think. I have mine on the first setting.

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