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EskeRahnVarious tech stuff ………. |
Obviously it is easy to calculate the diagonal of e.g. a sensor from the width and height with Pythagoras.
And a bit more tedious the other way round using the aspect ratio. [*]
But for common aspect ratios it is even simpler, 1+1/n fractions within less than 0.4%
Continue reading “Diagonal to width, simple fractions. Different aspect ratios”
A limited test of three ultra-zoom compacts in the wide end
They are all old, but unfortunately no newer are offered.
Fast charging of batteries is very convenient, but comes at a price on the overall battery life.
Especially wireless fast charging has bad consequences!!
Continue reading “Fast charging batteries, the good and the bad.”
I stumbled upon this nice project by Christophe Geers.
And edited and enhanced it to a tool that works a bit like an advanced REPLACE /UPDATE to a tree on the PC based on the name of the device and the drives it exposes.
It is an efficient way to get changed & new files from a device to a PC.
Update: Now supports Exclude also.
It works with a WPD connected device, e.g. an Android device USB-connected in MTP or PTP mode.
Here an example of some of the tree generated
Most backup tools does NOT allow you to do an incremental backup, but they DO allow you to deselect e.g. images. So use this tool to do the incremental backup of the huge WPD-exposed stuff like the images/videos/music, and let your backup tool do backups of all the rest – and in more finite time than a total backup of everything every time – thus making it a bliss to take backups much more often….
The Sony RX100 III is the third of four in the RX100 series of chubby compacts with a 1″ sensor and a fast F1.8-F2.8 lens , and thus great lo-light abilities in a very compact though not easily pocketable unit.
Continue reading “Sony RX100 III, Early impressions, might become a review.”
This is a plain PhotoViewer with just TWO special function:
The ability to show more EXIF info than most and to delete or transfer matching partner files on request also, according to user defined masks.
E.g. Also handle RAW or cropped variant of a file named with predefined syntax.
Settings for position, size, splitter positions, last used folders… can be saved in users registry.
Download zip: PhotoView.Zip
This is a ‘work in progress’, so expect bugs might be present, and that things can still change quite a bit. (Last modified 2018-09-30)
Continue reading “PhotoView with Delete&Transfer of matched files, e.g. RAW”
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 scaling/zooming/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 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 fine! Have a look at this on different subpixel arrangements. Several pixel arrangement exists out there, that could have similar issues…
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”
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”
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”
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”
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
