DPReview.com is closing April 10th - Find out more

R5 Pixel Shift rumor

Started 3 weeks ago | Discussions thread
John Sheehy Forum Pro • Posts: 26,688
Re: R5 Pixel Shift rumor

matejphoto wrote:

It would be great if they could do it.

Something like 80MP (in real resolution) equivalent from a tripod would be nice.

Final pixel resolution can only be integer multiples of 45MP (45 to defeat the CFA, 90, 135, 180, 225, 270, etc).  If you are thinking of "equivalent" as the number of details with significant contrast, a la DxO's "Perceptual MPs", then of course there will be a falloff in increased returns as you go higher, but I don't think everyone appreciates how valuable an over-sampled image is as far as further resampling is concerned; if you did, say, 16 positions, the pixel-level detail would be very soft, but if you downsampled that directly to you display resolution, you will get fewer resampling and aliasing artifacts than starting from a single 45MP original image. Don't forget, this would be mostly used with still scenery at base ISO, so if you combine 4 images, you get half the noise; 16 images, 1/4 the noise, etc, with the actual ISOs being a small fraction of that of each exposure.  So, at ISO 50, a 16-position shift would yield a true ISO of 50/16 = ISO 3.125.  You can sharpen the hell out of that without introducing much visible extra high-frequency noise that sharpening creates when noise is visible or barely subliminal in a single image.

-- hide signature --

Beware of correct answers to wrong questions.
John
http://www.pbase.com/image/55384958.jpg

Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow