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EskeRahnVarious tech stuff ………. |
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.
It is rather similar to the 230ACX with some important upgrades, and a few step backs
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!!
![ccdsizes[1]](https://eskerahn.dk/wp-content/uploads/2015/05/ccdsizes1.gif)
From http://www.dpreview.com/news/0210/02100402sensorsizes.asp
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…
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.
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.
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)
A compare of the low light abilities of these two cameras in extreme lo light conditions.
![1426237696653[1]](https://eskerahn.dk/wp-content/uploads/2015/05/14262376966531.jpg)
versus ![F900EXR_Black_Front_Left_76975fa68b[1]](https://eskerahn.dk/wp-content/uploads/2013/05/F900EXR_Black_Front_Left_76975fa68b1.jpg)
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:
F * √N < W , (N number of sensors in Mpixels, W in mm, red light F numerical aperture)
![AR-principles[1]](https://eskerahn.dk/wp-content/uploads/2015/05/AR-principles1-300x95.jpg)
![Airy_disk_spacing_near_Rayleigh_criterion[1]](https://eskerahn.dk/wp-content/uploads/2015/05/Airy_disk_spacing_near_Rayleigh_criterion1-196x300.png)
Resolution beyond 1/12000 of viewing distance is pointless for most
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)
The effective pixel count falls with the amount of light, the less the pixel size the worse.
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
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”
I can HIGHLY recommend this Automower 230ACX, as it have exceeded my expectations.
![7f4781b0[1]](https://eskerahn.dk/wp-content/uploads/2015/05/7f4781b01.png)
It has handled my highly sloped 1000m² lawn for seven full seasons, with some minor repairs outside the warranty along the way.
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…
Review, Fujifilm F900EXR.
Official images etc see FujiFilms own page here
Official user guide can be found here
Originally posted 2013-05-23
![F900EXR_Black_Up_ffbfa0522f[1]](https://eskerahn.dk/wp-content/uploads/2013/05/F900EXR_Black_Up_ffbfa0522f1.jpg)
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 “FujiFilm F900EXR, Review”
The “Battery Use“-app is part of the OS, and is located
Settings > About phone > Battery use
First here is a collage of screen-dumps (click to view) from it (see comments towards the end)
Continue reading “Android, “Battery use”, more than meets the eye”
On general battery info and hints see this
Continue reading “How to obtain good stamina on an Android phone”
(at least this is my intention on how it should end and be used)
It should give info about batteries, how the phone uses them, and (hopefully) with some good hints to how to get the most out of each battery (Life and Stamina). Many of the hints go for other hardware with Li-Ion batteries as well. Say Laptops, Toothbrushes…..
This thread is originated from SonyEricssons Xperia phones.
s
On problems with weird drops and raises: Try “Johan’s Trick” below once
The currently best advice I can give for the usage pattern is
● Try to charge fully and deplete to about 40-50%bc
● Once in a while drain battery deep to get calibration right
● Keep phone on desk/in bag, avoid pockets, to keep cool.
● Leave phone idle while charging (e.g. while sleeping).
Note that the ‘remaining percentage’ you see is an ESTIMATE not a measurement!
Review on CX3 variants CX4, CX5 and CX6 are less trifles identical.
Conclusion:
A really great camera – in 2010, Still fast and with outstanding macro by 2017 (compacts) 
…though a bit boxy and thick (almost 3cm thick).
![0203[1]](https://eskerahn.dk/wp-content/uploads/2010/07/02031.jpg)
Macro examples: Dust on a dead flies eyes and subpixels from a QFHD (3840×2160) monitor
Sorry this is Danish only – and text only (almost). For English please try translate.google.com version
OVERBLIK
Et fantastisk lækkert kamera, omend det er lidt fysisk stort af et kompaktkamera.
PROS
Mulighederne for kontrol og indstillinger inkluderer
Der er dog et par ‘torne’ i rosenbusken, men jeg synes ikke de er alvorlige….
CONS
Sorry this is Danish only – and (almost) text only. For English please try translate.google.com version
This review is relative to the review of the closely related F60fd
Sorry this is text only.
This review is relative to the review of the closely related F50fd
Excellent light-sensitive camera, but rather slow. (Should be called F51fd)
This camera is almost identical to F50fd. See review on this.
It is primarily a firmware upgrade. Probably (?) with quite the same optics, CCD and IS
Only (real) differences
+ Improved AF (Fixed!)
+ Optional 6Mpixel with less hard compression
+ Slightly bigger screen
? Possibly a little better WB
? Possibly better zoom motor
– Poorer ergonomics, due to larger screen
Sorry this is Danish only – and text only. For English please try translate.google.com version
PROS
CONS
Sorry this is Danish only – and text only. For English please try translate.google.com version
PROS
CONS
Sorry this is Danish only – and text only. For English please try translate.google.com version
PROS
CONS
Sorry this is Danish only – and text only. For English please try translate.google.com version
PROS
CONS
