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Messages - Rocky

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466
EOS Bodies / Re: 5Dii sensor recycled into new FF entry body?
« on: November 19, 2011, 10:22:14 PM »
The real key would be if there was a significant drop in the amount of silicon wasted in the 12" vs 8" wafers as it also stands to reason that the 12" wafers are going to be more expensive than the 8" wafers (a 12" wafer is 225% of the area of an 8" wafer.)
There are 22 FF potential site on an 8 in wafer and 56 potential site on the 12 in wafer. The major (90% +/-) cost of the finished wafer is in the processing, not the starting wafer.  So there is 245 % gain in potential site between the 12 in and 8 in wafer. Let us assume that the cost of 12 in finish wafer is 150% of the 8 in wafer (I am being generous here, It can be as low as 125%, depends on the wafer fab). Then the FF sensor cost from the 12 in wafer will be 60%  of the 8 in wafer.

467
EOS Bodies / Re: 5Dii sensor recycled into new FF entry body?
« on: November 19, 2011, 03:49:55 PM »
But being able to "print" FF sensors in a single pass rather than two doesn't increase the yield from a single wafer.
Single pass will finitely reduce the cost. just imagine now canon cando 10 stepping instead of 20. You will get the picture.   Also there will be a yield inrease also due to cutting the alignment error into half , and  less handling of the wafers.

468
EOS Bodies / Re: 5Dii sensor recycled into new FF entry body?
« on: November 19, 2011, 02:04:37 AM »
Given where the pricing of the 5DII is currently headed, it gives an indication that Canon may have space for an 18-20MP mid range full frame body, and a 30+ MP body as well.  I would see it as more likely that Canon would use a "detuned" version of the 1Dx sensor.  That would almost be like the way car manufacturers use one engine block and then add various combinations of turbochargers, superchargers, intercoolers etc. to create engines with different outputs - just look at the VW Golf range as an example.
From a manufacturing stand point, It is cheaper to make the same sensor for 1DX and another FF body. Canon can make a cheaper body with the same sensor by puting less features and lower level of AF, give it ONE Digic 5, platic body, no built-in vertical grip  etc.

469
There are two types of "USM". The "ring type USM" is the original USM that is used in the L lenses and some older lenses, like the 35-135mm. However, Canon has be using the term USM on micromotor type of focusing mechanism, like the 50mm f 1.4 and some of the lower priced non-L lense. Unfortunately, It is hard to find out what type of USM is being used on the non-L lenses.

470
PowerShot Cameras / Re: The Future of the G Series
« on: November 13, 2011, 12:46:52 PM »


APS-C and Mirrorless. That is a good idea. Jut hopeCanon can do a fast AF. I should come with its own line of lenses to keep the size small. Also Canon should provide the Ef/EF-S and Leica M mount adapter.

A lot of those who lurk around CR would like that.  However, we swim in a small pond, and probably are not representative of the boarder market.  The other problem with making a camera like this small is that with the flange very close to the focal plane, light will be hitting the sensor at a very oblique angle - especially for short and fast lenses.  Leica has already dealt with this, and I think patented the associated micro-lens design.  It would be a lot of R&D effort for Canon to do something similar to satisfy a relatively small market - hence the costs could be very high.
You are right about the lens fringe is close to the sensor, everybody is trying to make a thin body. However, the manufacturer also does not push the lens towards the lens mount. They move it outward . that is why we have not yet see very short lenses for the mirroless. By doing that they can make the light hitting the sensor in a less oblique angle. If the Sony NEX can do it, Canon should be able to do it.

471
PowerShot Cameras / Re: The Future of the G Series
« on: November 13, 2011, 01:40:13 AM »
The G series will be replaced by a mirrorless system.

Regardless of what Canon does, there will need to be a big departure for the G series.  Originally the G series served those users who wanted to move to digital, but could not yet afford a DSLR.  For instance, the G5 started out at a retail in the USA of just under $800.  Contrast that with the 1100D that listed at around $600.  Without taking inflation into account that shows one aspect of the movement of the market.

The niche occupied by the G series has been driven ever thinner.  Where size is not an issue, the 1100D makes more sense.  Where size is an issue, the S100 makes more sense.
I would like to see the G series morph into a mirrorless system - preferably with an APS-C sensor - hopefully Canon could develop economies of scale by using the same sensor as in its APS-C DSLRs.  I wonder though if the niche for such an animal is not too small to be economically viable.  - The Sony NEX-7 is, of course, a counter-example to my last statement.  If Sony can put such a product into the market, I would like to see Canon do something similar, just with an overall package encouraging manual control, and with a good selection of fast primes.

APS-C and Mirrorless. That is a good idea. Jut hopeCanon can do a fast AF. I should come with its own line of lenses to keep the size small. Also Canon should provide the Ef/EF-S and Leica M mount adapter.

472
Lenses / Re: Gear Acquisition Syndrome: please help!!!
« on: November 12, 2011, 08:21:15 PM »
Zeiss sounds like a good prescription for my problems but I am concerned about manual focus. I could try switch off AF on what I have and see out it goes.

http://www.flickr.com/photos/paolofontana/

Switch off AF on a af camera with AF lens witll not give you the same feel as using manual focusing lens. The focusing adjustment is too gross on the AF lens.

473
Lenses / Re: Realistic wish lens
« on: November 12, 2011, 08:17:24 PM »
Thanks . now I understand why  these two lenses are left out on my post. these two are either m43 or e- mount. My original post is for FF SLR or FF DSLR.

474
Lenses / Re: Minimalist photography
« on: November 12, 2011, 08:05:27 PM »
I have been less than a minialist for 2 years with 20D plus 17-40mm L.  That will fit 90% of my need. After that I got  a used 35-135mm.

475
Lenses / Re: Realistic wish lens
« on: November 12, 2011, 03:57:17 AM »
Thanks for the info. Out of all the lenses in the list that is faster than 1.2, only the Canon 50mm 1.0L is for DSLR, the rest are for range finder.  The canon 1.0 has been discontinued for the reason stated in the article. the article re-enforce about the difficulty of making a fast 50mm DSLR lnes. Even Nikon made the 1.2 SLR lens in 58mm, not 50mm.

For what its worth, there are a few fast m43 lenses.  Eg the Voigtlander 25mm/0.95 and the Noktor 50mm/0.95. These are both comparatively small.  The Noktor is also quite affordable.

Thanks for for head up. However, I cannot find any information on the two 0.95 lenses that you have mentioned in the official importer's site (Camera Quest). Even they exist, they arefor range finder, not FF DSLR.  Also I am not aware of any really fast M43 lens either. Please supply more information. Thanks

476
Lenses / Re: Does a lens hood reduce the light?
« on: November 11, 2011, 01:14:36 PM »
May I stress that the hood also help protect the lens from foreign objects like dust, water splash your own finger etc.

477
Lenses / Re: Does a lens hood reduce the light?
« on: November 10, 2011, 11:22:05 PM »
A hat with big rim will do wonder. with shorter lens, you just wear your head low and use the rim to shade the sun.  If you can hold and shoot with one hand,, then the other hand can really manipuate  the hat for shade.

478
Lenses / Re: Does a lens hood reduce the light?
« on: November 10, 2011, 12:02:40 PM »
I always use lens hood (almost 100%) if I have time to put it on. The hood will not cut down USEFUL light and will not need additional aperture opening. It will cut down unwanted flare. It will help protect the lens from dust, water and foreign objects, especislly for people like me that do not use filter to protect the lenses.

479
Lenses / Re: Realistic wish lens
« on: November 10, 2011, 11:54:40 AM »
here are som lenses that is faster then 1,2 http://blog.digitalrev.com/2010/08/15/5-fast-50mm-lenses-that-are-worth-selling-a-kidney-for/
Thanks for the info. Out of all the lenses in the list that is faster than 1.2, only the Canon 50mm 1.0L is for DSLR, the rest are for range finder.  The canon 1.0 has been discontinued for the reason stated in the article. the article re-enforce about the difficulty of making a fast 50mm DSLR lnes. Even Nikon made the 1.2 SLR lens in 58mm, not 50mm.

480
Lenses / Re: Realistic wish lens
« on: November 10, 2011, 02:50:16 AM »
50mm 0.75  ;D
Dream on!!! If Canon can make it...

Didn't they already, in the 60s? Or was that someone else...? (they've had a 50/1.0 EF-mount, and i'm pretty sure a 50/0.95 at some point).

But yeah, goes against the "realistic" specification either way.

Yes,  Canon made a 50mm f 0.95 for their range finder in the 60s. Leica is making a 50mm f 0.95 ($11,000) for their M series Range finder camera now. It is a lot easier to make a fast 50mm lens for the range finder camera than the for SLR. As far as I know, the fastest 50mm lens for SLR is f 1.2.  0.75 is more than another stop faster. it will be quite a challenge.

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