Tech blog

This blog is for my future and past info and reviews on various tech stuff….

Phones / Phablets
Compact cameras
Various tech
Various tech stuff
Resolution and Noise
Batteries and usage
Code examples
Other stuff
Other stuff

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 & Facts

    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)

    AR-principles[1] Airy_disk_spacing_near_Rayleigh_criterion[1]

    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...


  • Panasonic TZ70, Review

    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

    1426237696653[1] 1420186774799
    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...


  • Automower 230ACX, Husqvarna, Review

    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.

    Continue reading...


  • Thinkpad Yoga 12.5″ 20CD S1, Review

    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…

    Continue reading...


  • FujiFilm F900EXR, Review

    Review, Fujifilm F900EXR.
    Official images etc see FujiFilms own page here
    Official user guide can be found here

    Originally posted 2013-05-23


    Overall: Quite satisfied. 8/10

    F900EXR_Black_Up_ffbfa0522f[1] F900EXR_Black_Front_Left_76975fa68b[1]

    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!!

    Continue reading...



Blog in English (well sort of, bare with me, non-native…), a few earlier than 2010 are just blunt copies of the source texts in Danish – Google translate helps here….

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’.