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04-10-2017, 06:31 PM - 1 Like   #31
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QuoteOriginally posted by mee Quote
Pentax line might see more Sigma support.
Yes please.

07-09-2017, 10:32 AM   #32

Join Date: Jul 2011
Posts: 2,385
QuoteOriginally posted by acoufap Quote
This thread is inspired by repeating discussions about APSC vs. FF. I’d like to share my maybe unprofessional thoughts about this topic. They lead to another than the current camera paradigm. To support this paradigm camera designs have to be changed in some manner.

For most people 15 MP are sufficient for on screen viewing and printing - if you consider distance of view. Of course you get more resolution with an 24 MP APSC sensor or more. But most people don’t need it - I think. What you get extra with an APS C 24 MP sensor is more room for cropping. But apart from that I’d say the K-5 IIs seems to be a nearly unbeatable package.

Why is a K-1 with 36 MP FF sensor a good thing?

The 36 MP FF sensor of K-1 gives us freedom. We don’t need this resolution for every image. But we have the opportunity to crop between 36 and 15 MP as we like and get sufficient image size and a great range of angle of view with moderate focal lengths.

We can use APS-C lenses that give us great square crops on FF sensor that are not possible with an APS-C camera / sensor! I showed some examples with the DA15 on the forums. You can’t realize this (angle of view!) with an APS-C camera. And DA15 and any other lens doesn’t cost any more if you use it with the K-1.

In general with 36 MP FF sensors and upwards I think we should change our technic based camera paradigm. I try to explain this.

Image circle size is the basic distinction of lenses at same focal length for a given type of mount. The image circle qualifies in being fully FF compatible or „only“ being APS-C.

As written above 15 MP that the K-1 offers in APS-C mode are enough for most use cases. So why not get away from image sensor size centric (what a word ) firmware design (FF and APS-C) to a flexible crop design based on at least 36 MP FF sensor with flexible crop and flexible image ratio (1:1, 3:2, 3:4, ...) in the range of 15 to 36 MP.

This kind of change should also have impact on camera hardware.

I think of
  • overlays in the viewfinder that have to support crop flexibility (ratio and crop sizes) for composition and / or go the mirrorless camera route.
  • flexible image sensor readout to generate raw files that exactly represent these crops.
  • the image circle defines the crop boundaries. Lenses should know their image circle/s and inform the camera about it/them. The camera should take the value’s and compute the maximum crop for the lens based on the users preference (ratio, size). In case of lenses that can’t deliver their image circle the user should be able to define it through the user interface. Angle of view and pixel crop size should be shown on display.
  • ...

Change in camera paradigm like this would give us photographers a lot more freedom in our photographic work - especially composition. And the way we talk about lenses and their abilities would change. No more discussion about FF vs. APS-C. Based on image circle knowledge and computation every lens could be used to it’s maximum possibilities!

Enough of my fantasies. What do you think about it? Would you be interested in a camera offering such flexibility?

Regards, acoufap

- I’m not a camera designer or specialist. These thoughts may be a little bit naive.
- K-1 "plattform" could be a strong starting point for the change! I already use many APS-C lenses in FF and square crop mode and crop in post according to the lenses image circle(s). IMO the K-1 successor should offer such flexible functionality to go a step in this direction.
Sensor size defines the price tag of a camera as well as the size and weigth of lenses, better to say the whole system.
Today we comapre APS-C, FF, MF size cameras/lenses. There is not enough room to build a system around FF with different image circles. Ricoh tried that with lens boxes for the GXR - combine sensor and lens to be mounted on the camera body for capture and processing.
Lots of dicussion about something that requires a change in basic parameters first - price and size of lenses/sensors.

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