Curved sensor
2,579 posts
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Posted 07/01/2018 - 20:33
I think this is a Sony development, The idea being that the distance from the lens to the edge of the sensor is the same as to the centre, so eliminating distortion. Don’t know how that would work with the various Pentax features which move the sensor around like SR and pixel shift though.
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Posted 07/01/2018 - 22:04
It's been done before with cameras with curved pressure plates for film. The idea was that it compensated for cheap lenses that were mass produced. I'm sure in a modern context that won't be the reason though!
Best regards, John
Best regards, John
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Posted 08/01/2018 - 05:39
When talking about curved sensors I presume it is actually spherical, a one plane curved sensor would be a lens makers nightmare.
Cheers
Brian.
LBA is good for you, a Lens a day helps you work, rest and play.
Cheers
Brian.
LBA is good for you, a Lens a day helps you work, rest and play.
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Posted 08/01/2018 - 08:25
McBrian wrote:
When talking about curved sensors I presume it is actually spherical, a one plane curved sensor would be a lens makers nightmare.
When talking about curved sensors I presume it is actually spherical, a one plane curved sensor would be a lens makers nightmare.
Quite so, and would it need to change with different lenses and focal lengths? The physics is way beyond me. And, when exported to a flat format live view, screen or print does the image not simply revert to what would have been recorded on a flat sensor?
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Posted 08/01/2018 - 09:37
RobL wrote:
And, when exported to a flat format live view, screen or print does the image not simply revert to what would have been recorded on a flat sensor?
And, when exported to a flat format live view, screen or print does the image not simply revert to what would have been recorded on a flat sensor?
They may do something opposite (or inverse) of what lens correction does?
Best Regards,
Gajan
Flickr : link
Pentax K-1, Pentax HD D-FA 28-105mm F3.5-5.6 ED DC WR, Pentax FA 77mm 1.8 Limited, Pentax-D FA 100mm f/2.8 Macro WR
Pentax K-5, Pentax 18-135 mm f/3.5-5.6 ED AL IF DC WR, Pentax DA 55-300mm F4-5.8 ED WR
Pentax K100D Super, SMC Pentax 3.6-:5.4 18-55mm AL
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Posted 08/01/2018 - 10:16
Lenses project a curved image onto a flat surface, and good ones do it very well, managing to keep centre and edges in sharp focus at the same time. This is especially true of macro lenses, which are often used to make flat copies.
A cheap lens will show field curvature and at wider apertures the edges may not be in focus when the centre is. This is easy enough to discover using a newspaper as a target. One solution is to curve the film/sensor so that everything is in focus.
The other thing is deliberate field curvature and Minolta made a VC lens where the amount of curvature could be dialled in. This made semi-circular groups of people easy to photograph without distortion and whilst keeping them all sharp. It's not been a mainstream idea that's caught on in any great way, except probably within the secrets inside inexpensive compact cameras.
Best regards, John
A cheap lens will show field curvature and at wider apertures the edges may not be in focus when the centre is. This is easy enough to discover using a newspaper as a target. One solution is to curve the film/sensor so that everything is in focus.
The other thing is deliberate field curvature and Minolta made a VC lens where the amount of curvature could be dialled in. This made semi-circular groups of people easy to photograph without distortion and whilst keeping them all sharp. It's not been a mainstream idea that's caught on in any great way, except probably within the secrets inside inexpensive compact cameras.
Best regards, John
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Posted 08/01/2018 - 12:16
johnriley wrote:
The other thing is deliberate field curvature and Minolta made a VC lens where the amount of curvature could be dialled in. This made semi-circular groups of people easy to photograph without distortion and whilst keeping them all sharp. It's not been a mainstream idea that's caught on in any great way, except probably within the secrets inside inexpensive compact cameras.
The other thing is deliberate field curvature and Minolta made a VC lens where the amount of curvature could be dialled in. This made semi-circular groups of people easy to photograph without distortion and whilst keeping them all sharp. It's not been a mainstream idea that's caught on in any great way, except probably within the secrets inside inexpensive compact cameras.
In case anyone else tries Googling for more detail they were called 'VFC' in the case of the 24mm (VC brings loads of Tamron stabilized 'vibration control' hits).
They also made a 35mm shift lens with variable field curvature.
While they look interesting but not something I'd really have a use for, especially given the price they go for!
Mike
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Pentax:K5ii, K7, K100D, DA18-55, DA10-17, DA55-300, DA50-200, F100-300, F50, DA35 AL, 4* M50, 2* M135, Helicoid extension, Tak 300 f4 (& 6 film bodies)
3rd Party: Bigmos (Sigma 150-500mm OS HSM),2* 28mm, 100mm macro, 28-200 zoom, 35-80 zoom, 80-200 zoom, 80-210 zoom, 300mm M42, 600 mirror, 1000-4000 scope, 50mm M42, enlarger lenses, Sony & micro 4/3 cameras with various PK mounts, Zenit E...
Far to many tele-converters, adapters, project parts & extension tubes etc.
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Last Edited by petrochemist on 08/01/2018 - 12:41
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Posted 08/01/2018 - 12:56
Many thanks for the correction!
Best regards, John
Best regards, John
Link
Posted 08/01/2018 - 17:37
johnriley wrote:
Lenses project a curved image onto a flat surface, and good ones do it very well, managing to keep centre and edges in sharp focus at the same time. This is especially true of macro lenses, which are often used to make flat copies.
A cheap lens will show field curvature and at wider apertures the edges may not be in focus when the centre is. This is easy enough to discover using a newspaper as a target. One solution is to curve the film/sensor so that everything is in focus.
The other thing is deliberate field curvature and Minolta made a VC lens where the amount of curvature could be dialled in. This made semi-circular groups of people easy to photograph without distortion and whilst keeping them all sharp. It's not been a mainstream idea that's caught on in any great way, except probably within the secrets inside inexpensive compact cameras.
Lenses project a curved image onto a flat surface, and good ones do it very well, managing to keep centre and edges in sharp focus at the same time. This is especially true of macro lenses, which are often used to make flat copies.
A cheap lens will show field curvature and at wider apertures the edges may not be in focus when the centre is. This is easy enough to discover using a newspaper as a target. One solution is to curve the film/sensor so that everything is in focus.
The other thing is deliberate field curvature and Minolta made a VC lens where the amount of curvature could be dialled in. This made semi-circular groups of people easy to photograph without distortion and whilst keeping them all sharp. It's not been a mainstream idea that's caught on in any great way, except probably within the secrets inside inexpensive compact cameras.
petrochemist wrote:
In case anyone else tries Googling for more detail they were called 'VFC' in the case of the 24mm (VC brings loads of Tamron stabilized 'vibration control' hits).
They also made a 35mm shift lens with variable field curvature.
While they look interesting but not something I'd really have a use for, especially given the price they go for!
In case anyone else tries Googling for more detail they were called 'VFC' in the case of the 24mm (VC brings loads of Tamron stabilized 'vibration control' hits).
They also made a 35mm shift lens with variable field curvature.
While they look interesting but not something I'd really have a use for, especially given the price they go for!
Interesting stuff!
Best Regards,
Gajan
Flickr : link
Pentax K-1, Pentax HD D-FA 28-105mm F3.5-5.6 ED DC WR, Pentax FA 77mm 1.8 Limited, Pentax-D FA 100mm f/2.8 Macro WR
Pentax K-5, Pentax 18-135 mm f/3.5-5.6 ED AL IF DC WR, Pentax DA 55-300mm F4-5.8 ED WR
Pentax K100D Super, SMC Pentax 3.6-:5.4 18-55mm AL
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Posted 08/01/2018 - 19:10
Think the rumor has been discarded as fake. At least in regards to the GR.
'Photography...it remembers little things, long after you have forgotten....' (Aaron Siskind)
'Photography...it remembers little things, long after you have forgotten....' (Aaron Siskind)
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Posted 08/01/2018 - 22:00
Varible field curvature lenses are an entirely different concept to curved sensor.
VFC lenses manipulate circular lens groups to modify the peripheral field curvature projected on to a FLAT plane, this is a very different concept to projecting on to a curved plane. I can see it possibly working for a sperical sensor but I don't think we will ever see it in consumer/everyday professional gear.
Cheers
Brian.
LBA is good for you, a Lens a day helps you work, rest and play.
VFC lenses manipulate circular lens groups to modify the peripheral field curvature projected on to a FLAT plane, this is a very different concept to projecting on to a curved plane. I can see it possibly working for a sperical sensor but I don't think we will ever see it in consumer/everyday professional gear.
Cheers
Brian.
LBA is good for you, a Lens a day helps you work, rest and play.
Last Edited by McBrian on 08/01/2018 - 22:00
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Posted 09/01/2018 - 03:11
Sadly it's not likely to be about the results, but the fact it's curved (i.e. about to become trendy). Curved Tv screens are dreadful unless you're positioned perfectly. John's right, film cameras with rubbish plastic lenses used a curved pressure plate to make up for the lens aberrations. However, lens design has tanked over the years, based on the premise that your image processing software has a lens profile to correct for the lens used - the designers don't seem to need to bother getting the best from the 'glass' (much of which is plastic of varying quality).
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stu62
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If true what would the advantage of the curved sensor and will it make it's way on to the forth coming Pentax cameras