Tech blog

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

Watches, bands & rings	Phones / Phablets	Compact cameras	Reviews	Resolution and Noise
Batteries and usage	PC & Code	Various tech stuff	Math	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….

• Phillips BDM4065UC, Mini 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...</p> <p> </p> <p>
• QWERTY for Iphone6

  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...</p> <p> </p> <p>
• Superzoom and DOF plus TZ70 iZoom

  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...</p> <p> </p> <p>
• Panasonic TZ70 vs FujiFilm F900EXR in lo light

  A compare of the low light abilities of these two cameras in extreme lo light conditions.
  versus                  

  Reviews available here: TZ70 and F900EXR

  Continue reading...</p> <p> </p> <p>
• 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)

  

  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...</p> <p> </p> <p>

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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’.