This blog is for my future and past info and reviews on various tech stuff….
Phones / Phablets
Various tech stuff
Resolution and Noise
Batteries and usage
Newer reviews can be expected to be ongoing projects, with minor additions or corrections.
Note: When I rate stuff, a 10/10 does not indicate perfect in an absolute academic sense, but as in (at least) as good as could be expected at the time, minor flaws allowed. For portable devices typically limited by the size and weight. Value for money also counts. An electronic device that got a high score in 2005, most likely would seem like pure trash ten years later….
- Megapixel-craze and tiny sensors & lenses. Myths & FactsContinue reading...
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.
- Panasonic TZ70, ReviewContinue reading...
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 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!!
- Automower 230ACX, Husqvarna, ReviewContinue reading...
I can HIGHLY recommend this Automower 230ACX, as it have exceeded my expectations.
Overall: Really satisfied. 9+/10
It has handled my highly sloped 1000m² lawn for seven full seasons, with some minor repairs outside the warranty along the way.
- Thinkpad Yoga 12.5″ 20CD S1, ReviewContinue reading...
This is an almost perfect combination of an ultrabook and a tablet. 😀
The first felling when opened is the feeling of mechanical QUALITY that can handle rough treatment. I have a strong feeling that should I drop it it is more likely to dent my floor…
- FujiFilm F900EXR, ReviewContinue reading...
Originally posted 2013-05-23
Overall: Quite satisfied. 8/10
Minor firmware improvements could easily make it even better. You are left with no way to override the AF even when it fails(!), you can not even request focus at infinity!!
Newer postings are in English (well sort of, bare with me, non-native…), some earlier than 2010 just blunt copies of the texts in Danish.
Collecting of old stuff started May 2015. Entries are generally attempted dated with original stamps, even if they are somewhat updated since, several reviews have been ongoing ‘projects’.