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Messages - Bob Howland

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136
EOS-M / Why no Sigma DN lenses for Canon M?
« on: January 29, 2013, 01:52:47 PM »
Sigma makes 19 f/2.8 and 30 f/2.8 lenses for Micro-4/3 and Sony E-mount lenses and just announced a 60 f/2.8 lens. The Canon M-mount uses the same 18mm flange distance as the E-mount and a sensor size between M43 and E-mount. The lens protocol is almost certainly very similar to the protocol used for EF and EF-S lenses. So why haven't they introduced these lenses for Canon?

Any guesses? Oh, by the way, I just e-mailed Sigma with the same question. I'll let you know if/when they reply.

137
EOS Bodies / Re: Canon's Roadmap for 2013 [CR2]
« on: January 27, 2013, 12:57:30 PM »

I don't have a 7D. But what I've heard and read from those who have both it and a 5DIII, even using the same lenses for little birdies when they're distance-limited with both bodies, the 5DIII still beats the 7D.


What you have heard and read is absolutely correct. The 5D3 puts the 7D to shame ... 1.6 crop factor notwithstanding!



Not correct.
Same lens, same distance, decent light, and a large print - the 7D print will be better.


That would be a fair assessment if the AF demands were not too stringent.

The AF demands would have to be very stringent indeed. I've yet to find a situation where my 5D3 would focus but my 7D wouldn't, at least with a "reasonable" amount of light. Mostly I use the 7D as a 1.6X teleconverter when shooting outdoor sports, a role for which it is admirably suited. I think that 7D images are better than  cropped images from a 5D3 or using a teleconverter and a 5D3, except maybe with my 300 f/2.8. I have noticed that 7D images have more contrast and less dynamic range than 5D3 images.

I'm waiting for the Canon M1, the professional model in the M series. With no mirror to move, 24FPS might be possible.

138
EOS Bodies / Re: Canon's Roadmap for 2013 [CR2]
« on: January 27, 2013, 08:57:08 AM »
After the introduction of the Metabones Speed Booster, I have to wonder if Canon will introduce a version of their own for M-bodies and EF lenses. Conceivably, they could make one with 0.62996 magnification (1.5874 crop factor) while increasing the aperture by 1-1/3 stops, an improvement of 1/3 stops over the Metabones.

139
EOS Bodies / Re: Any news on the 7dMk2 now that CES is done
« on: January 24, 2013, 05:10:08 PM »
I agree with jrista about EVF's been a long way away from being truly good, but I also agree with your point that technology grows quickly, and it certainly will get there, probably sooner than the decade that jrista predicts.
One of my co-workers brought in an Olympus E-M5...we played comparison between it and a 7D. The EVF on it is comparable to the 7D, it takes better quality pictures in poor light, about the same in good light, and I really can't tell the difference in AF speed or accuracy. I was amazed that this camera was so good. It's hard to deny the existance of something you are holding in your hands... this wasn't just an EOS-M killer, it was a Rebel killer too, and if it wasn't for the way better user interface on the 7D and Canon Lglass, it would have topped the entire APS-C lineup.

And apparently Olympus has announced that the replacement for the E-5 will support both 4/3 and micro-4/3 lenses, which kind of implies that it will be micro-4/3 with an adapter. Nikon users are also complaining about there being no D400. My guess is that everybody is working on professional mirrorless cameras and that the 7D replacement will actually have the name "M1". When it comes is anybody's guess.

Something like the Metabones Speed Booster makes this possible.. That device has a magnification of 0.707 and gives a 1-stop improvement in maximum aperture. However, the Canon version of APS-C is 1.6X  not 1.5X. Therefore, a Canon-specific booster could have a magnification of 0.629 and give a 1-1/3 improvement in maximum aperture.

140
EOS-M / Re: To buy M or not to buy M?
« on: January 21, 2013, 08:55:14 AM »
Perhaps the only point of the mirrorless from Canon is to keep the party faithful from giving up and buying one of the strong products from other manufacturers.

Or to complete the merger of still photography and video. Granted the current offerings are absolutely pathetic but consider the possibility that the 7D2 (or some "M1" professional model) will be M-mount and capable of taking 24FPS. And, oh yes, that extra pin in the M lensmount is for power zoom and introduced concurrently with the 7D2/M1 are a series of video-centric zoom lenses with that capability.

141
Lenses / Re: New EOS-M Lenses Soon [CR2]
« on: January 17, 2013, 07:32:23 AM »
Hopefully Canon and/or Metabones will introduce a Speed Booster Adapter ( See http://www.metabones.com/info/105-info/154-speed-booster ) for Canon FF lenses on the M body. That might actually convince me to buy an M body, although not the current one.

142
It was annoying that they did not include a focus limiter switch, and it's painful to see that they've now changed the design (and at such a price) to include what should've been there.  However, I feel that when I'm careful I can usually work around this problem.
Based on my experience and observations, the resulting images would not be acceptable.
That's not been my experience.  Did you look at the teleconverter-attached images at POTN forums?  With the EF Extender III I rarely have any problem with the 2011 version.

If you are shooting with a camera with smaller pixel pitch than the 7D and need critical resolution then there may be a problem.  Occasionally the images seem somewhat less than critically sharp - but only at 1:1 magnification (discounting focus errors of course).  I've got a good number of shots that are more than acceptably sharp in my view.  The weakness of the lens and TC combination comes when shooting at somewhat longer ranges against a busy background - occasionally (such as an image across a swamp / small lake) I have gotten an unacceptably busy rendition of OOF backgrounds.  No doubt the 200-400 will excel in this area, hopefully even with the TC active.

The 200-400 will be the single-lens option for wildlife if you cannot afford to remove the lens in the field (I admit this is somewhat burdensome to change), but 120-200mm has been useful surprisingly often and f/2.8 even more so.

After all these considerations, I would be reluctant to toss out the 120-300 entirely in favor of the 200-400 TC 1.4 - especially as it seems to excel in relatively close-up to medium range photography (although you have to work around the minimum focus distance - 1.5m at the wide end, and 2.5m at the far end - it is able to focus closer than many other lenses in this range).  The price on  the original model couldn't be beaten, either - maybe one of the better lens deals in recent times, and I hope the price increase doesn't reflect Sigma's belief they sold the original too cheaply.  I was definitely limited by funds to that lens, however, and for that reason the 120-300 + TC combination will still be tempting compared to the 200-400mm.  It seems to handily beat consumer-oriented lenses in the 1X0-400mm and 1X0-5X0 (etc.) ranges.

Thanks for the comments. I've only used the Sigma TCs and have not been impressed with the 2X. I still would prefer a 200-500 f/4 lens, even if it is substantially heavier and more expensive.

143
Obviously we're not seeing any tests with this lens yet, but if it performs well with a 1.4x TC I could see this standing in as my poor-man's 200-400mm-ish (168-420mm FF) type of lens for some of that distant action and animal stuff that I.... never do :)

Except that the 200-400 comes with a 1.4X TC, making it a 280-560. To do that with the 120-300 would require a 2X TC. Based on my experience and observations, the resulting images would not be acceptable. Sigma needs to scale up the 120-300 design into a 200-500 f/4. Their 200-500 f/2.8 is an overweight, overly expensive joke.

144
Lenses / Re: Canon 100mm macro IS vs non-IS - any further input?
« on: January 05, 2013, 08:44:27 PM »
I've got the non-L non IS 100.  Mine is about 10 years old and it is a great lens.  I don't use it for hand held macro photography.  My macro work is done strictly on a tripod.  For general purpose photography, I sometimes use this lens and, of course, my photos are hand held.  It produces terrific results and I have no need to upgrade to an L or to IS with this particular lens.
Same here.

145
EOS Bodies / Re: What no one else seems to have noticed
« on: January 01, 2013, 08:46:59 PM »
The 1DXs will take EF-S lenses!

I'm going to assume that you're not joking. Taking EF-S lenses might be a useful feature in a 40MP camera costing $3000 but, for a camera probably costing $8000+, who cares?

146
EOS Bodies / Re: Does a 39.3mp Sensor Exist? [CR1]
« on: December 31, 2012, 07:25:37 PM »
As some here probably already realize, 39.3 megapixels is kind of a magic number, since its resolution is probably 7680 (i.e.,1920 X 4 and 3840 X 2) horizontal by 5160 vertical. If you want a C300-style 2 x 2 binning sensor, except capable of being cropped to 3840 X 2160, that is the resolution you would want.

Good observation. A 4x4 HD 3:2 sensor has 39.3 MP; a 5x5 has 61.4 MP

I don't think that 5x5 would work. The bayer sensor uses a 2x2 block of two green, one blue and one red pixels. Using odd numbers would require taking pixels from an adjacent block. I don't think the 5D3 uses 3x3 binning, although the horizontal resolution is 5760 or 3 x 1920.

147
EOS Bodies / Re: Does a 39.3mp Sensor Exist? [CR1]
« on: December 30, 2012, 12:12:41 PM »
As some here probably already realize, 39.3 megapixels is kind of a magic number, since its resolution is probably 7680 (i.e.,1920 X 4 and 3840 X 2) horizontal by 5160 vertical. If you want a C300-style 2 x 2 binning sensor, except capable of being cropped to 3840 X 2160, that is the resolution you would want.

148
Lenses / Re: New lenses for 46mp camera?
« on: December 24, 2012, 02:23:15 PM »
I've long read how most of the current lenses are more than capable of out resolving anything on the MP horizon, and I thought it very likely to be true, but when i look at DXO's "mpix" rating of lenses, i start to wonder.
 
BTW-I'm ISF certified, yet i have no idea what a quad-HD television is, but i don't disagree with Bob's point.
Sorry, 3840 X 2160

149
Lenses / Re: New lenses for 46mp camera?
« on: December 24, 2012, 09:52:29 AM »
can't imagine i'd ever need 46mp.. so i'd stick to what i have anyway..

I bet you couldn't imagine that you needed 12mp about 10 years ago. The worlds changing buddy, get on the train and hold on tight, or be left behind :P

Yes, the world certainly is changing but I doubt that anybody using a Nikon D4 (16MP) or Canon 1Dx (18MP) will feel "left behind". Professionals, increasingly, are seeing their images displayed small in size and at low resolution. Even a quad-HD television is still only 8MP.

150
EOS Bodies - For Video / Re: Do you miss APS-C?
« on: December 14, 2012, 10:36:37 AM »
i own and use both a 5D3 and 7D. This pairing replaced a 5D and 40D. The 7D is used principally with my 100-400 and 300 f/2.8 (with and without TCs) for sports photography. Very often, the 100-400 will be on the 7D and a 70-200 on the 5D3. With the focusing improvement, the 5D3 is a passable sports camera, something the 5D never was.

However, I have also used a (1) 17-35 on the 5D/5D3 and 24-70 on the 40D/7D, (2) 24-70 on the 40D/7D and 100-400 on the 5D3 and (3) 17-50 on the 40D/7D and 70-200 on the 5D/5D3.

Having said that, if I were regularly shooting events and/or weddings, I would certainly buy another 5D3 and relegate the 7D to backup status.

Regarding the mythical 7D2, I want improvements in DR and high ISO image quality over the 7D, not more pixels. That's what I said about the 5D3 over the 5D2 and that's what Canon delivered.

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