Hasselblad "true focus feature"
Posted 08/01/2010 - 08:37
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This is mainly bullshit,...sorry!..marketing hype....
Hassy has been slipping in it's sales recently due to it's thinking that by making it's digital back proprietry it would 'force' the use/purchase of it's system. However, many digital MF users waited for better and more versatile systems to appear which is now happening.
MF cameras did not even have auto-focus until fairly recent times when F&H added it to the Rollei 6000 series (?) Makes you wonder HOW we all managed to get such sharp pix for all those years!
Hassy has been slipping in it's sales recently due to it's thinking that by making it's digital back proprietry it would 'force' the use/purchase of it's system. However, many digital MF users waited for better and more versatile systems to appear which is now happening.
MF cameras did not even have auto-focus until fairly recent times when F&H added it to the Rollei 6000 series (?) Makes you wonder HOW we all managed to get such sharp pix for all those years!
Posted 08/01/2010 - 08:46
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This is addressing focus and recompose if I understand it correctly. In which case I do't think it's BS - I have found that in many cases focus and recompose leads to less than precise focus. I wouldn't pay anything for this feature but I would welcome it.
Mike
Mike
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You can see some of my shots at my Flickr account.
You can see some of my shots at my Flickr account.
Posted 08/01/2010 - 08:57
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It's well established that this is a factor worth addressing at close distances - typically when looking for sharp eyes in portraits.
With the Pentax cameras Quick Shift makes an adjustment possible. If the camera did it automatically, then why not?
With the Pentax cameras Quick Shift makes an adjustment possible. If the camera did it automatically, then why not?
Best regards, John
Posted 08/01/2010 - 09:37
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This is simply the use of computer circuits to keep track of the focus point setting on a particular lens when the camera is panned or recomposed. Obviously it only has relevance when depth of field is at a minimum. In real camera systems intended for general photography, focus point is not, contrary to popular belief, absolute. In any application where this is going to be able to work efficiently, or even demonstrably, it's going to be possible to achieve the same effect manually anyway.....
.......Frankly, this is simply yet more nonsense that complicates the process of making images to the detriment of basic technique and understanding, and no substitute for good design.
.......Frankly, this is simply yet more nonsense that complicates the process of making images to the detriment of basic technique and understanding, and no substitute for good design.
Posted 08/01/2010 - 11:08
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So what good design would you postulate that is more efficient than a clever bit of technology that will help improve the results of lots of photographers. And certainlty make things no worse for anyone else.
Obviously indeed it's most relevant where DOF is limited, but that's what it was designed for.
Obviously indeed it's most relevant where DOF is limited, but that's what it was designed for.
Best regards, John
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1130 posts
20 years
Netherlands
http://www.gizmag.com/hasselblad-h4d-true-focus-60-megapixel/13503/
"Due to the physics of an SLR-camera, the off-center focus points that are offered are all clustered relatively close to the center of the image. To set focus outside of this center area, the photographer is still forced to focus first, and then shift the camera to reframe, with the resulting loss of focus as a result." Hasselblad has overcome this problem by using modern yaw rate sensor technology to measure angular velocity in an innovate way. The result is the new Absolute Position Lock (APL) processor, which forms the foundation of Hasselblad's True Focus feature.
The APL processor logs camera movement during any re-composing, then uses these exact measurements to calculate the necessary focus adjustment, and issues the proper commands to the lens's focus motor so it can compensate. The APL processor computes the advanced positional algorithms and undertakes the required focus corrections at such a rapid speed that Hasselblad says no shutter lag occurs. The H4D's firmware then further perfects the focus using the precise data retrieval system found on all HC/HCD lenses.
“This technology takes AF to an entirely new level, correcting for the vertical and horizontal focus-shift that results from the rotation of the camera around an axis close to camera, said Poulsen. “In simple terms, True Focus allows the photographer to concentrate on their composition, to focus on their creativity, while True Focus takes care of the other, more mechanical focus.”
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