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Messages - neuroanatomist

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7816
Lenses / Re: APS-C lens mm are correct
« on: December 03, 2012, 08:56:07 PM »
Consider this scenario. The view and angle through the viewfinders for the following two scenarios will be identical:
Canon 7D with the 18-135mm zoomed to 18mm.
Canon 5D with an 18mm Full Frame only lens.

If you had no idea what camera I handed you, and gave you these two configurations, the image through the viewfinder would be identical and you wouldn't know which configuration I gave you.

100% WRONG.

In that scenario (EF-S lens at 18mm on APS-C vs. EF lens at 18mm on FF), the FF viewfinder (and captured image) would show a much wider angle of view.

If you are at 18mm on APS-C and 29mm on FF, then what you see in the VF will be the same.

7817
use the single center point.  Take your focus, keep the shutter pressed 1/2 way down and recompose your shot.  It will keep the original focus

Great advice, if you like backfocused shots.  Of course, f/4 or f/5.6 usually gives sufficient DoF to mask the focus error...

7818
@ Halfrack - thanks!!!

7819
The OP's monopod thread mentioned a 70-200/2.8. I have a question for users of the CarrySpeed and/or SpiderHolster - how well do they work (if at all) when attached via the lens tripod collar?  Also, does the CarrySpeed plate twist?

The only method I can think of is to use the Spider clamp or the same Kirk clamps with the bracket or pin on the backside.  Still have that paranoid if it isn't tight fear though.

What do you mean by 'twist' with the CarrySpeed plate?

Makes sense, thanks.  Seems with the SpiderHolster, you'd just hang by the body plate, regardless.  Since I use an RRS L-bracket, I'll give their AS clamp some thought.

By twist I mean rotate in the tripod socket (it shouldn't do that).  The RRS plates/brackets have a lip that wraps over the edge of the camera bottom to prevent twisting.

7820
It seems like CarrySpeed is the only one making a strap + plate for the Arca-Swiss set (F-1), while SpiderHolster has an addon plate that makes their plate Arca friendly (I just use the CarrySpeed F-1 plate with the SpiderHolder).  Spider also has a Arca clamp attachment that allows you to hang a RRS type setup off their belt.

The OP's monopod thread mentioned a 70-200/2.8. I have a question for users of the CarrySpeed and/or SpiderHolster - how well do they work (if at all) when attached via the lens tripod collar?  Also, does the CarrySpeed plate twist?

7821
EOS Bodies / Re: Downgrade to crop
« on: December 03, 2012, 06:30:11 PM »
However in this situation, we are reproducing the same sized image from the same area of sensor, ergo the dof is the same.

That would be true with film, but it's not true with digital.  Besides focal length, subject distance, and aperture, DoF is also affected by CoC.  So, the crop sensor actually gives a (slightly) shallower DoF when the first three factors are all constant.



I am sorry but you are looking at this wrong. The CoC is the same size for both images, think about it, the pixels don't know how big the sensor is and once you crop it doesn't matter how big the sensor was, it only matters how much you use, a FF camera cropped down to the size of a crop camera is exactly the same and I used the same area from both sensors. The CoC is only relevant with regards reproduction percentage, or how much you enlarge something, if the subject is the same size on the sensors (which it is) and the print/screen is the same size (which they are) the CoC is the same size (assuming the same aperture). I have cropped both sensors so effectively they are the same size, same reproduction size and same subject magnification, the DOF is the same.

CoC follows the same rules for film and digital, it is just the distance at which a point becomes a circle.

Sorry for the confusion, but I was talking about shooting both sensor formats at 1:1 lens magnification, no cropping involved.

7822
Amazon isn't the place. B&H and Adorama carry Kirk, Wimberley, and most others. Really Right Stuff is sold only directly on their website, but their gear is excellent.

7823
EOS Bodies / Re: Downgrade to crop
« on: December 03, 2012, 03:19:10 PM »
However in this situation, we are reproducing the same sized image from the same area of sensor, ergo the dof is the same.

That would be true with film, but it's not true with digital.  Besides focal length, subject distance, and aperture, DoF is also affected by CoC.  So, the crop sensor actually gives a (slightly) shallower DoF when the first three factors are all constant.

If you'll print 24x36" and hang on your wall, the 7D wins
So an un-cropped 5d3 file printed to 24*36" has no real world win over a 7d? Or, have I lost something in the ambiguity?
Daniel, that is quoting out of context. Neuro was comparing a cropped 5DII image to a 7D's.

Correct - I am talking about the situation where you're 'focal length limited' and using a crop sensor for the greater (apparent) reach, whereas if you had a FF sensor you'd have to crop the image to the FoV of the APS-C sensor, to get the desired framing.  Doesn't matter if it's 5DII or 5DIII - in both cases, the cropped FF image will be similar in IQ to the APS-C image, but have fewer MPs. 

If you can get closer or use a longer lens (or you decide to show more of the background), the FF camera will 'win' and that's exactly what I stated in my post.

7824
Software & Accessories / Re: B+W ND filters from 2filter.com
« on: December 03, 2012, 03:12:40 PM »
Schneider Optics is the parent company of B+W (has been for years).  You seem to be suggesting the B+W 'brand' is going away, and they will be labeled Schneider Optics?  I hadn't heard that...

I ordered a Schneider Optics filter from 2filter, customer service was great (it was an uncoated 10-stop ND, and that was the only 82mm 10-stop available before the B+W one was (re-) released).  But B+W has a 10-stop MRC now (even 82mm), so if you order a B+W one, that's what you should get.

7825
The Arca-Swiss system is as close to a universal system you'll find for QR plates/clamps.  Plates and clamps from Wimberely, Kirk, Really Right Stuff, Arca Swiss, Markins, AcraTech, Foba, and others are all interchangeable.  I have a mix of Wimberley and RRS plates on my bodies and collared lenses, and I use them with clamps/ballheads/etc. from Wimberley, RRS, and Kirk.  I've got a nice Manfrotto 468MG ballhead, came with a clamp for the Manfrotto RC2 plate, but I simply unscrewed that clamp and replaced with a Wimberley C-12 clamp, and all my plates fit.

On the Rhino slider you mentioned, there's a 3/8" stud - you'd simply attached a ballhead to that, with the appropriate clamp, and you're good to go.

7826
EOS Bodies / Re: Downgrade to crop
« on: December 03, 2012, 02:00:36 PM »
7D (given the same camera distance BUT different framing) has shallower DoF (paper towel in background has more blur as does the front portion of the husk...

This is absolutely true, but often overlooked or not understood.  The shallower DoF with FF only applies if the framing his the same, and that's because of the greater subject distance needed for the same framing with a crop sensor at a given focal length.

People often suggest that a crop sensor is better for macro shooting, because of the greater number of pixels on target, but also "because of the deeper DoF with a crop sensor."  But the latter does not apply at 1:1 macro shooting, since the distance will be the same regardless of sensor size.  Personally, I prefer FF for macro shooting because at 1:1 I can frame a larger subject (e.g. a FF can frame a quarter at 1:1 but APS-C cannot frame even a dime at 1:1).

7827
EOS Bodies / Re: April 2013 firmware update for EOS 5D Mark III
« on: December 03, 2012, 01:48:37 PM »
No need for rumors.  This was covered in an actual announcement from Canon.  The big points are uncompressed HDMI out and f/8 AF capability.  Here's Canon's press release.

7828
Third Party Manufacturers / Re: 5Dmk3 doesnt play with kenko teleconverters
« on: December 03, 2012, 01:44:26 PM »
...the culprit here is some incompatibility with AF microadjusting. To get the Kenko 1.4x to cooperate with your 5DmkIII, you must first disable AFMA and then *take one picture*. After that you can swap on your TC and everything should work normally – apart from having AFMA. You can also re-enable AFMA immediately as long as your TC+lens combo doesn't actually use it (i.e. has +0 setting).

Before the 1D X was updated for f/8 AF, I was strongly considering a Kenko TC - in fact, I had one in my B&H cart when I got a little heads-up on the forthcoming FW update.  Not sure if this issue occurs with the 1D X, but reading this makes me really happy that I can get f/8 AF with Canon extenders.

7829
EOS Bodies / Re: 5D Mark III Tips, Tricks & Settings
« on: December 03, 2012, 12:59:59 PM »
Is it possible to get it to meter using the selected AF point instead of the center of the frame?
Nope unfortunately not thats the realms of 1D bodies only

I know it's not supposed to be able to do that, but sometimes it does. For instance while sitting in a dark room and shooting down a well-lit hallway, it meters down the hall way with center AF point, but meters for the room when using the right-most AF point (on wall of dark room).

Yes, but that's evaluative metering weighting the exposure toward the selected AF point.  It's not the same as spot metering.  Does it give similar results in some situations?  Yes...but then, a stopped analog clock shows the right time twice per day. 

7830
EOS Bodies - For Stills / Re: Suggestions for a first monopod for a 5D3...?
« on: December 03, 2012, 12:53:34 PM »
Yes, get a QR plate designed for the lens and keep it in place.
 
I'd get a monopod that had a simple ball head and the same QR plate as your tripod.
First, consider if you want to switch to the much more universal Arca Swiss style QR plates.  Your Manfroto head can be adapted to take them, mine is.  Then, in the future only buy heads that accept Arca Swiss compatible plates.  That opens you up to a much wider range of options rather than being tied to Manfroto.

+1 - I started with the Manfrotto RC2 system, and it was a weak link.  There's a bit of play still when the plate is locked, which makes fine positioning on a tripod/ballhead a challenge sometimes. 

I had a Manfrotto 694CX monopod with a 234 tilt head.  The head is fine for lenses up to your 70-200/2.8 (I used it frequently with a gripped 7D 100-400).  The 234 head comes in two flavors, one with an RC2 clamp, the other with just a 1/4"+3/8" reversible stud.  I got the latter and put a Wimberley C-12 clamp on it for quick release with Arca-Swiss plates (a Wimberley P-20 on my 70-200/2.8, I now have a mix of Wimberley and RRS plates on all collared lenses). 

Also, consider a Blackrapid strap for when you're carrying the lens around all day - much better than a neck strap.  Attach the BR strap to the lens plate (if Manfrotto RC2, get the BR FastenR-T1 to replace the Manfrotto D-ring, if using an Arca plate, get a small clamp like the Kirk QRC-1" and connect the BR lug to that).

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