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Comment by Gajan posted on Curved sensor at 08/01/2018 - 17:37
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?
They may do something opposite (or inverse) of what lens correction does?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?
Comment by Gajan posted on Curved sensor at 08/01/2018 - 09:37
It made me feel concerned (and happy) too, when I saw massive discounts on bodies and lenses recently.
Comment by Gajan posted on It’s gone a bit quiet recently at 08/01/2018 - 09:32
JAK wrote:
All four look fine to me.
Thank you John. And you could be right - it may be the same fella!Gajan wrote:
Are they all robins?
Yep! (Probably the same one.)Are they all robins?
All four look fine to me.
Comment by Gajan posted on Garden Visitors at 29/12/2017 - 21:13
Beautiful shots!
Comment by Gajan posted on A few birdy shots down at the local reserve. at 29/12/2017 - 21:09
Season's greetings everyone!
Comment by Gajan posted on Another pointless thread at 24/12/2017 - 11:21
I took these using my K5 and HD PENTAX-DA 55-300mm F4-5.8 ED WR from my back garden. I had to use manual focus to avoid hunting and missing the target though.
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Gajan
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Gajan
Comment by Gajan posted on Lenses For Aviation Photography at 15/12/2017 - 10:20
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.
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!