Originally posted by stevebrot Upsampling is extrapolation. If you can live with the detail loss, go for it.There are a few other threads on this site that discuss printing strategy in some detail. I have them bookmarked somewhere and will post the links if I find them.The software used for printing counts
Yes, I understand / agree with that.
Originally posted by stevebrot Sensor size is irrelevant. Optical enlargement to the sensor is irrelevant
About those two first points, I like to know more about the background for coming to such conclusion.
Knowing that most recent camera models have sensors with 5um (or less) pixel pitch, I consider sensor size instead of pixel resolution. I could observe on print that the edges and corners show some blur (from the lens) which is independant from lack of sharp detail by lack of pixels. When corners start to look fuzzy, the middle of the print can still be zoomed in an extra 30% without seeing distracting blur. Just to test if my logic is flawed or not, I consider a digital sensor with infinite resolution, what's left is the optical bandwidth and sensor size. And given what I can see with the K1, tells me that the A7RIV would be of little benefit except for cropping the center area of the image when the optical resolution is maximum.
A better definition (to complete my initial post) would be:
- if the pixel pitch is >= than 5um, consider pixel resolution and PPI for estimating print size.
- if the pixel pitch is < 5um, consider sensor size for estimating print size.
---------- Post added 23-01-20 at 18:40 ----------
Originally posted by ToddK I think it depends on the subject of the image.
That's not included in my post, and yes, relative size of the subject in the frame is key. I looked at the gallery prints of David Yarrow (wildlife photographer and Nikon ambassador) who used a D810 and D850 for capturing his photographs , then 1:1 square crops printed at 48", 60" and 70". I asked myself "how can he blow up D810 images that much?" then I understood the "trick": the subject covers as much as 30% to 50% of the frame, whether it shows the face of a lion very close, or elephants (he stands away from the camera that he triggers using a remote control device).
Last edited by biz-engineer; 01-23-2020 at 10:42 AM.