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Author Topic: "1Dsq" & 3D [CR1]  (Read 32659 times)

Rocky

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Re: “1Dsq” & 3D [CR1]
« Reply #45 on: January 28, 2011, 01:44:18 PM »
Anyone who has issues with using a "square format" sensor should buy a Hasselblad 500 series camera with an 80, 120 or 150mm lens, 10 rolls of Provia 100f or Velvia 100, and shoot at least 2 photos a day for 2 months. By the time those two months are up, you'll be wondering why every camera doesn't have a square sensor (with a landscape/ portrait crop option, for those few occasions where that works better). Guaranteed...
I do not have problem with the squre format. However, I do want to point out why Hasselblad (also Rollieflex and other copies) is using a square format. The penta prism for Hasslblad (Rollieflex also) is extremely heavy and expensive. so It it not an option for most of the users. Waist level view finder is the norm for the users.  So can you imagine people using it side way??? The squre format will eliminate the rotaion of the camera body.
Back to the arguement about "Standard  height to width ration".  There is no standard. However, human vision do have more width than height, it is about 3:2, individual milage may vary. That is why the movie industry set this standard at the beginning and Leica adopted it since day one and evey body follows. TV has been using 4:3 for a long time. Movies has been using wide screen for a long time also. DH TV has moved away from 4:3. So what is the right ratio???
The only thing that we will give up in square format is the angle of view in the horizotal direction. For any given lens, it will be narrower.
There are people agrue that with square format ( based on existing FF lens) will have less usable sensor area.  It nay not be the case. Let us use 8 X 10 print as a case for discussion. For a FF, an 8 X10 will use  24mm X 30mm area of the sensor. on a quare 30mm X 30mm sensor, it will stil use 30mm X 24mm. Exactly the same! For 12 X14 print,  24mm x 28mm will be used from FF. It is actually smaller than the 30mm X 25.7 mm from the 30mm square sensor.

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Re: “1Dsq” & 3D [CR1]
« Reply #45 on: January 28, 2011, 01:44:18 PM »

Etienne

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Re: “1Dsq” & 3D [CR1]
« Reply #46 on: January 28, 2011, 04:00:07 PM »
FF is 36 x  24 mm
A square sensor would have to be 36 x 36 mm, to reproduce the wide angle and DOF characteristics of FF.
This would probably make the body much more expensive.

KitH

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Re: “1Dsq” & 3D [CR1]
« Reply #47 on: January 28, 2011, 06:39:09 PM »
wasn't something written before Chirstmas about the production cost of FF sensors?  specifically they're very difficult to manufacture and prone to wastage through random defects.  As I recall, APS-H was the largest size to fit onto the dies used to make silicon wafers without risking excessive wastage when a defect occurs.   My guess is a square format APS-H might be a lot easier to produce and could allow them to get to higher quality than FF at a reasonable fabrication cost.  Then carry on using the best parts of the EF lenses. 

I'm biased, I like square.  I was given a 6x6 Rollei for my 18th birthday, which led to many splendid pictures, but rather poor school exam results.   I still have that camera.  No idea where those exam certificates are.

bvukich

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Re: “1Dsq” & 3D [CR1]
« Reply #48 on: January 28, 2011, 07:34:40 PM »
I guess, if you cant beat 'em, join 'em...

http://www.youtube.com/watch?v=oOuW9odA9hA

Catastrophile

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Re: “1Dsq” & 3D [CR1]
« Reply #49 on: January 28, 2011, 08:08:05 PM »
if the FF sensor is increased by a factor of just 5.8% diagonally (ie to ~ 37.7x26mm, diagonal=45.7mm instead of 36x24mm, digonal=43.26mm), then one can shoot 16:9 (using all the 37.7mm and cropping a little bit from the 26mm), or 3:2 (cropping from both to 36x24), or 4:3 (using all 26 while cropping a bit from the 37.7), such cropping would result in an imaging area that has exactly a diagonal of 43.26mm (ordinary diagonal of FF), so FF lenses would be able to cover up to these dimensions for all 3 mentioned aspect ratio's without corner issues. would be nice if the RAW image use the whole 37.7x26 and one can decide later how the image will be cropped. just to note here the whole area itself is very close to 3:2 in aspect ratio.

have a look at this diagram if you find the explanation above not clear enough:
http://farm4.static.flickr.com/3061/2932234860_0f0d5242ed_z.jpg?zz=1
it was originally about one of the Panasonic multi-aspect cameras, so forget about the number of pixels in the W & H dimensions, and think in terms of the given percentage numbers, 100 is the diagonal of the original sensor (43.26 for FF).
« Last Edit: January 28, 2011, 08:16:48 PM by Catastrophile »

bvukich

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Re: “1Dsq” & 3D [CR1]
« Reply #50 on: January 29, 2011, 04:24:00 AM »
When will you guys get it? With the EF registry distance of 44mm you can't have a mirror that will give you a short side much over 24mm. It has nothing to do with lens baffles or image circles. It is impossible to make a reflex camera with a 44mm lens registry distance anything over a 26mm square, even a non moving pellicle mirror can't do it. The only way you can realise a longer short side, and see through the lens, is to read off the sensor.

That part never even crossed my mind.

A mirror to cover a 30.6mm tall sensor would be an absolute minimum of 43.27mm tall.

Rocky

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Re: “1Dsq” & 3D [CR1]
« Reply #51 on: January 29, 2011, 06:12:39 PM »
When will you guys get it? With the EF registry distance of 44mm you can't have a mirror that will give you a short side much over 24mm. It has nothing to do with lens baffles or image circles. It is impossible to make a reflex camera with a 44mm lens registry distance anything over a 26mm square, even a non moving pellicle mirror can't do it. The only way you can realise a longer short side, and see through the lens, is to read off the sensor.
From 24 X 36mm to 30X30mm, the "Shortside" onlyincreased by 6mm, ie. 3 mm on each end of the "short side". If you look inside the film slr or FF dslr. You can see that there are easily 3mm space between the edge of the view finder and the insde of the camera body. This space is "reserved for the morror movement. If we think outside of the box and put the mirror hinge at the bottom of the camera. It may be doable. 

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Re: “1Dsq” & 3D [CR1]
« Reply #51 on: January 29, 2011, 06:12:39 PM »

CR Backup Admin

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Re: “1Dsq” & 3D [CR1]
« Reply #52 on: January 29, 2011, 07:18:01 PM »
From 24 X 36mm to 30X30mm, the "Shortside" onlyincreased by 6mm, ie. 3 mm on each end of the "short side". If you look inside the film slr or FF dslr. You can see that there are easily 3mm space between the edge of the view finder and the insde of the camera body. This space is "reserved for the morror movement. If we think outside of the box and put the mirror hinge at the bottom of the camera. It may be doable.

How would auto focus work?  Where would the sub mirror be located?  The mirror would hit the sensor if it swung down, and block all light if it swung up. Remember, the mirror is diagonal at about 45 degrees, so it grows more than the increase in the sensor height.
« Last Edit: January 29, 2011, 07:19:35 PM by scalesusa »

bvukich

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Re: “1Dsq” & 3D [CR1]
« Reply #53 on: January 29, 2011, 07:26:04 PM »
When will you guys get it? With the EF registry distance of 44mm you can't have a mirror that will give you a short side much over 24mm. It has nothing to do with lens baffles or image circles. It is impossible to make a reflex camera with a 44mm lens registry distance anything over a 26mm square, even a non moving pellicle mirror can't do it. The only way you can realise a longer short side, and see through the lens, is to read off the sensor.
From 24 X 36mm to 30X30mm, the "Shortside" onlyincreased by 6mm, ie. 3 mm on each end of the "short side". If you look inside the film slr or FF dslr. You can see that there are easily 3mm space between the edge of the view finder and the insde of the camera body. This space is "reserved for the morror movement. If we think outside of the box and put the mirror hinge at the bottom of the camera. It may be doable.

The mirror is on a 45 degree angle, so 6mm of sensor equates to 8.48mm of mirror ( 6*sqrt(2) ). There is only 44mm from the front face of the flange, to the film (sensor) plane.  Being able to flip up a 43.27mm mirror in that space will be tight, to say the least.  With careful body design, it may be possible.

To flip down, you would probably need even more room, because then you have to clear the shutter too.

c.d.embrey

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Re: 1Dsq & 3D [CR1]
« Reply #54 on: January 29, 2011, 10:31:11 PM »

 ... the most important thing I don't like is the cost of lenses that are large enough to cover a square image sensor.  and the need to buy a totally new set of them.  for that reason, I think all the square sensor rumors are very unrealistic, unless canon is looking to seriously alienate a large portion of its professional and serious amateur customer base.

Canon has done that before when they switched from the FD mount to the EF mount in 1987. The FD mount was introduced when Canon built their first Pro Camera, the F1. And lots of Pros were really unhappy when Canon made all their FD lenses obsolete. No reason that history can't be repeated.
« Last Edit: January 30, 2011, 02:53:03 PM by Canon Rumors »

c.d.embrey

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Re: “1Dsq” & 3D [CR1]
« Reply #55 on: January 29, 2011, 11:03:00 PM »

Back to the arguement about "Standard  height to width ration".  There is no standard. However, human vision do have more width than height, it is about 3:2, individual milage may vary. That is why the movie industry set this standard at the beginning and Leica adopted it since day one and evey body follows. TV has been using 4:3 for a long time. Movies has been using wide screen for a long time also. DH TV has moved away from 4:3. So what is the right ratio???

In the conventional motion picture format, frames are four perforations tall, with an aspect ratio of about 1.37:1, 22 mm by 16 mm (0.866 in × 0.630 in). This is a derivation of the aspect ratio and frame size designated by Thomas Edison (24.89 mm by 18.67 mm or 0.980 in by 0.735 in) at the dawn of motion pictures, which was an aspect ratio of 1.33:1

VistaVision (used for a few years by Paramount Studios) was an 8 perf wide (film running sideways in the camera) format that was changed from sideways (using an optical printer) to conventional 4 perf for projection at aspect ratios between 1.66:1 and 2.00:1 By making a reduction print from the larger they got finer grain prints. When film improved VistaVision died.

So no motion pictures were ever shown at 1.5:1. Low budget wide screen was done by shooting 1.37:1 and cropping the picture to 1.85:1 with a projector mask.

Leica just took vertical 4 perf and changed it to horizontal 8 perf for their cameras.

c.d.embrey

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Re: “1Dsq” & 3D [CR1]
« Reply #56 on: January 30, 2011, 11:33:11 AM »

Canon made the right choice when they switched lens mounts in '87. They knew, and understood from the outset, that AF worked best when the AF motor is in each lens.

That's beside the point. Doesn't make any difference why they did it, or that it was what allowed Canon to over-take Nikon with Pro shooters.

The point is that Canon did it ... and will probably do it again at some point, when they see an advantage to doing it, i.e. a square sensor or a mirror-less camera.

Osiris30

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Re: “1Dsq” & 3D [CR1]
« Reply #57 on: January 30, 2011, 01:12:57 PM »

Canon made the right choice when they switched lens mounts in '87. They knew, and understood from the outset, that AF worked best when the AF motor is in each lens.

That's beside the point. Doesn't make any difference why they did it, or that it was what allowed Canon to over-take Nikon with Pro shooters.

The point is that Canon did it ... and will probably do it again at some point, when they see an advantage to doing it, i.e. a square sensor or a mirror-less camera.

So by that logic, anything that has ever happen will happen again.  Sorry but that argument is so incredibly weak it's not even funny.  Canon caught a LOT of flak over the move to EF at the time.  It cost them *alot* of pros, even if they stayed with Canon they lost a ton of good will, at the time.

Canon may launch a new mount for mirrorless, but only because the flange back requirements will be lower.  This will mean it will still be compatible with EF lenses through an adapter.  The same isn't true if you go to a square sensor and need to increased the flange back.  Unless Canon goes MF I don't think you'll see a new, non-mirrorless mount for a LONG time.

Just because something has happened in the past doesn't mean it will or should happen in the future.

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Re: “1Dsq” & 3D [CR1]
« Reply #57 on: January 30, 2011, 01:12:57 PM »