I have made a simple test image to test the resolution of your eyes on a phone, phablet, tablet, laptop or PC!
The most common result is it is pointless to go beyond around 1/12000 of the viewing distance
Be SURE it is shown in the screens native resolution. e.g. 960 pixels should fill half a FullHD display. (or use one of the added ones with your screens resolution)
Be SURE that your browser or your windows settings doesn’t do any zooming or smoothing, i.e. one pixel in the image is one pixel on the display. (If in doubt take a magnifying glass -or macro camera- and look closely on the screen, it should be like the mock-up later in this post)
It is the point where the single line pair is indistinguishable from the double line we are looking for (that is where it is looks like one continuous thick line)
You will most likely find the finest resolution using the red or green figure.
Use any prescribed glasses that you normally would for the distance – we are testing resolution, not focusing ability.
NOTE: If you got a pentile display, usually the green will do! Pentile usually got red and blue subpixels in diagonal ‘lines’, so this might mess up the result, so you are testing the display and not your eyes, as the pixels are not in the normal square grid the test was made for. The rating of density for pentile is not the same as for a regular, so be careful doing the calculus. A test made for pentile in red or blue should rather use diagonal lines, but the alignment would matter. And things easily get a little muddy in counting the density. Other pixel arrangement exists out there too, that could have similar issues…
Continue reading “Eye resolution test”
Currently the limitation in the amount of photons that can be caught versus the noise, set a limit for the dynamic range.
But what if the sensor output could not be over saturated?
Continue reading “Principal ideas for smarter image sensor technology”
This Automower 330X is an upgrade from my 230ACX, See review here.
Overall: Really satisfied. 9+/10, after software ‘update’: 7+/8
It is rather similar to the 230ACX with some important upgrades, and a few step backs
Continue reading “Automower 330X, Husqvarna, Review”
When a sensor is advertised/sold as 1/2.3″ most people would think that is the diagonal of the sensor. Well it is NOT! It might even vary drastically between manufacturers.
For historical reasons the diameter of a fictitious Vidicon tube with the same active area is what is advertised!!
Unfortunately, it is even more confusing than that…
Continue reading “Digital camera sensor sizes – selling elastic bands by the metre”
The ONLY way I could get a suitable replacement for my Xperia Pro was with an Iphone6- and a keyboard case.
Click image to go to dilbert.com
I have now been using it for over four months – and still would love to upgrade it to something decent…
Continue reading “I confess, I HAD an Iphone6- … Review”
About two months ago I bought a great monitor
And I do mean great in more than one sense!
The short conclusion is that I can warmly recommend it.
Continue reading “Phillips BDM4065UC, Mini review.”
I have for 4½ months been using cheap bluetooth keyboards for an Ip6, And I really hate Ios !!! (see review)
At the least two versions are available through ebay, in the price range varying between £9-16 from different vendors.
Continue reading “QWERTY for Iphone6”
It should be remembered that there are no miracles in superzoom!
And you should be careful on where your focus plane is, even if all in the frame to the human looks as ‘far away’.
Crop of 30x zoom:
(As usual, click to enlarge)
Continue reading “Superzoom and DOF plus TZ70 iZoom”
A compare of the low light abilities of these two cameras in extreme lo light conditions.
Reviews available here: TZ70 and F900EXR
Continue reading “Panasonic TZ70 vs FujiFilm F900EXR in lo light”
This is an attempt to replace some of the common myths, urban legends and misunderstandings with some facts.
(last updated 20181103)
There are at least three physical issues and one biological that are interesting:
1) Rayleigh’s criterion and sensor width.
F * √N < W , (N number of sensors in Mpixels, W in mm, red light F numerical aperture)
2) The eye’s real life resolution
Resolution beyond 1/12000 of viewing distance is pointless for most
3) Thermal noise.
Relative noise increases by 1/d, (+)almost √n and √T, (N number of sensors in Mpixels, d sensor diameter, T in kelvin, i.e. °C+273.15)
4) Effective pixel count
The effective pixel count falls with the amount of light, the less the pixel size the worse.
5) Stacking images
Stacking can compensate, but can not perform miracles.
6) Thickness of device versus sensor size
The angle of light to the sensor edges binds max sensor size to thickness.
Continue reading “Megapixel-craze and tiny sensors & lenses. Myths & Facts”
Panasonic Lumix TZ70 (ZS50 in the US)
Upgrade of TZ60 with larger/fewer pixels, RAW and better viewfinder, but removed GPS.
This post is likely to be enhanced/edited over the next days and weeks
Eske Rahn 2015-04-25
Overall: Really satisfied. 10/10
The only real competition today is the upcoming HX90V from Sony, that haven’t got RAW, and have pixels as small as the TZ60
The TZ60 took much beating due to the small pixels, And Panasonic answered that by increasing the pixelsize by a factor 150%, and thus reducing the pixelcount by the same to 12MP.
This is an obvious upgrade from Fujifilm F900EXR, that are beaten or on par in all areas, less triffles.
See my review of the F900EXR here. On which this review to some extend will be based.
Practically the whole plus-list could be repeated, and most of the cons are not there!!
Continue reading “Panasonic TZ70, Review”