FF sensor rumors
Posted 02/06/2015 - 17:24
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Thanks Peter
Rgds
Rgds
pgweber wrote:
2/3 of the length but (2/3) squared, i.e. 4/9 of the area.
Megapixels are analogous to AREA, not LENGTH.
So 36MP on full frame will be about 7348 x 4899 = 35,997,852 pixels (36MP).
Taking 2/3 of those lengths and multiplying gives 4899 x 3266 = 16,000,134 pixels (16MP)
Therefore 36MP FF has photosites/pixels of the same size as 16MP on APS-C.
Hope that clarifies?
Daronl wrote:
We don't yet know how a lens is mounted on the FF (ie. dimension from the rear element / lens mount to the sensor) so for simplicity if we consider the reduction in sensor coverage when the 1.5 x crop factor is applied (as a reciprocal) we should be able to calculate the number of photosites utilised in "Cropped mode" on the FF
Thus applying the reciprocal of the crop factor (1 x 3/2) the image circle should cover 66.66% of the FF sensor which is 24mp of 36mp.
No.We don't yet know how a lens is mounted on the FF (ie. dimension from the rear element / lens mount to the sensor) so for simplicity if we consider the reduction in sensor coverage when the 1.5 x crop factor is applied (as a reciprocal) we should be able to calculate the number of photosites utilised in "Cropped mode" on the FF
Thus applying the reciprocal of the crop factor (1 x 3/2) the image circle should cover 66.66% of the FF sensor which is 24mp of 36mp.
2/3 of the length but (2/3) squared, i.e. 4/9 of the area.
Megapixels are analogous to AREA, not LENGTH.
So 36MP on full frame will be about 7348 x 4899 = 35,997,852 pixels (36MP).
Taking 2/3 of those lengths and multiplying gives 4899 x 3266 = 16,000,134 pixels (16MP)
Therefore 36MP FF has photosites/pixels of the same size as 16MP on APS-C.
Hope that clarifies?
Daronl
Posted 08/06/2015 - 23:53 - Helpful Comment
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pentax has the option of moving the sensor forwards and backwards during exposure to adjust focus for different wavelengths of light and merging the data to remove aberrations and increase sharpness for every lens ever made...
just an idea... I dunno
just an idea... I dunno
Posted 09/06/2015 - 00:03
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It's my understanding that no one moves the sensor in/out towards the lens, as that directly impacts on the focus point of the shot.
Agree with the comments above about the cost of FF cameras. It will only drop as more manufacturers start using it. Presently 3 Canon, Nikon and Sony, but soon Pentax as well. It's just another sensor size, and should be selected on the basis of needing something the sensor offers, rather than a concept of being better simply based on size. Insert some typical 'it's how you use it' type joke in here...
Agree with the comments above about the cost of FF cameras. It will only drop as more manufacturers start using it. Presently 3 Canon, Nikon and Sony, but soon Pentax as well. It's just another sensor size, and should be selected on the basis of needing something the sensor offers, rather than a concept of being better simply based on size. Insert some typical 'it's how you use it' type joke in here...
Posted 09/06/2015 - 00:10
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richandfleur wrote:
It's my understanding that no one moves the sensor in/out towards the lens, as that directly impacts on the focus point of the shot.
Contax used this system on their only AF film SLR, the RX - probably because users having bought a collection of excellent (and expensive) Zeiss glass, wouldn't want to buy even more expensive AF versions of them as well.
It's my understanding that no one moves the sensor in/out towards the lens, as that directly impacts on the focus point of the shot.
Posted 09/06/2015 - 02:26 - Helpful Comment
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richandfleur wrote:
It's my understanding that no one moves the sensor in/out towards the lens, as that directly impacts on the focus point of the shot.
...
I think you completely missed the point I made... It's my understanding that no one moves the sensor in/out towards the lens, as that directly impacts on the focus point of the shot.
...
Aberrations occur because different wavelength of light will focus at different points when passing through glass.... ever see a prism separate light into it's colour components? I'm suggesting the sensor could be used to make a precise focus for each colour and merge the data to eliminate aberrations...
Posted 09/06/2015 - 04:00
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D0n wrote:
I'm suggesting the sensor could be used to make a precise focus for each colour and merge the data to eliminate aberrations...
Oh right, got you now.
I'm suggesting the sensor could be used to make a precise focus for each colour and merge the data to eliminate aberrations...
Posted 14/06/2015 - 02:36
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Nothing has changed in this forum.
50% of members think FF or similar is worth then what they have now,
25% don't give a damn
and 25 looking forward to using a FF with all the advantages and possible disadvantages it may have.
I am one of the FF enthusiasts.
Pentax fell behind, not only because of the inferior advertising, but also of the excessive time to stick with only the APS-C sensor.
The other 2 makers had also APS-C or similar sensors, but if you wanted, you could get a FF.
I hope Pentax does not release the new FF before the end of the year, this gives me time to save more.
I am looking forward to using my FA77mm Fa 43mm and all the other F and FA lenses how they should be used and not only part of it.
The moment I get a Pentax FF, my K5 get demoted to dragging around when I go camping in inhospitable areas.
FF Forever
Regards, Horst
50% of members think FF or similar is worth then what they have now,
25% don't give a damn
and 25 looking forward to using a FF with all the advantages and possible disadvantages it may have.
I am one of the FF enthusiasts.
Pentax fell behind, not only because of the inferior advertising, but also of the excessive time to stick with only the APS-C sensor.
The other 2 makers had also APS-C or similar sensors, but if you wanted, you could get a FF.
I hope Pentax does not release the new FF before the end of the year, this gives me time to save more.
I am looking forward to using my FA77mm Fa 43mm and all the other F and FA lenses how they should be used and not only part of it.
The moment I get a Pentax FF, my K5 get demoted to dragging around when I go camping in inhospitable areas.
FF Forever
Regards, Horst
Posted 14/06/2015 - 02:52
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D0n wrote:
However the diagram just applies to a single lens like use in a Box camera.
The reason, why most lenses have more than 1 element is not because the glass manufacturers like to use up surplus glass, but to correct all the aberrations as much as possible.
There should be no need to for the sensor ( if it could be done), to correct this and having to cope with
lenses with varying aberrations.
Let the sensor correctly capture what the lens you use is capable of. Don't forget, there are lenses specifically made with chromatic and other aberrations. If the sensor would correct all this, the lenses could not do what is expected.
Regards, Horst
Quote:
I think you completely missed the point I made...
Aberrations occur because different wavelength of light will focus at different points when passing through glass.... ever see a prism separate light into it's colour components? I'm suggesting the sensor could be used to make a precise focus for each colour and merge the data to eliminate aberrations.
D0n, what you say and describe is correct, I think you completely missed the point I made...
Aberrations occur because different wavelength of light will focus at different points when passing through glass.... ever see a prism separate light into it's colour components? I'm suggesting the sensor could be used to make a precise focus for each colour and merge the data to eliminate aberrations.
However the diagram just applies to a single lens like use in a Box camera.
The reason, why most lenses have more than 1 element is not because the glass manufacturers like to use up surplus glass, but to correct all the aberrations as much as possible.
There should be no need to for the sensor ( if it could be done), to correct this and having to cope with
lenses with varying aberrations.
Let the sensor correctly capture what the lens you use is capable of. Don't forget, there are lenses specifically made with chromatic and other aberrations. If the sensor would correct all this, the lenses could not do what is expected.
Regards, Horst
Posted 14/06/2015 - 13:01
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50mpCMOS wrote:
In the meantime, watch as Canon, Nikon, (even) Sony continue to steam roll forward; sensors that are 50+ mp and very soon they'll have their "entry level" full-frames that will cost not much more than a Pentax cropped sensor
Quote:
It may well be released later than originally stated
Two NYC mega-sellers, and also retail locations throughout Asia have stated the same exact thing. They know of release dates at least six to nine months in advance. Nothing has shown that ANY Pentax full-frame will be making release this year.It may well be released later than originally stated
In the meantime, watch as Canon, Nikon, (even) Sony continue to steam roll forward; sensors that are 50+ mp and very soon they'll have their "entry level" full-frames that will cost not much more than a Pentax cropped sensor
Kris Lockyear
It is an illusion that photos are made with the camera… they are made with the eye, heart and head. Henri Cartier-Bresson
Lots of film bodies, a couple of digital ones, too many lenses (mainly older glass) and a Horseman LE 5x4.
It is an illusion that photos are made with the camera… they are made with the eye, heart and head. Henri Cartier-Bresson
Lots of film bodies, a couple of digital ones, too many lenses (mainly older glass) and a Horseman LE 5x4.
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285 posts
11 years
It may well be released later than originally stated
In the meantime, watch as Canon, Nikon, (even) Sony continue to steam roll forward; sensors that are 50+ mp and very soon they'll have their "entry level" full-frames that will cost not much more than a Pentax cropped sensor