Henrik Herranen

Lives in Finland Tampere, Finland
Works as a Digital Signal Processing Software Engineer, MSc
Joined on Oct 6, 2005
About me:

Plan: To baldly shoot what everyone has shot before.

Comments

Total: 382, showing: 1 – 20
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On article Yongnuo announces YN 14mm F2.8 in Canon mount (155 comments in total)
In reply to:

CaPi: Amazing that Canon customers seem to need even more lens vendors. ;)
I was under the impression that they already had the widest variety to choose from.
Btw I would think that the featured offering would compete with other 3rd party lenses rather than oem equipment

CaPi: Being the market leader has its perks: a small piece of a big market is more than a huge piece of a niche market.

Link | Posted on Dec 30, 2017 at 11:50 UTC
On article How to photograph the northern lights (80 comments in total)
In reply to:

John Koch: The camera gear and settings are feasible. To attain the necessary latitude settings, however, can be expensive and chilly. The nights may be long, but cloudy. The short days in between shots must be very dim and bleak. Unless you live near the poles, air fare to Iceland may make it the most affordable option. Odd that no UK/Scot locations are listed.

Will B Milner and Barleyman: And the Scots would be wrong - at least most of the time.

The Northernmost corner of mainland Scotland is below the 59th latitude, which is pretty low. Heck, even Helsinki is to the North of that, and Helsinki is at the southern end of Finland!

I live at the 62nd latitude (200 km to the North of Helsinki). From time to time there are nice Northern Lights here - so good in fact that I took some completely acceptable pictures with my Canon PowerShot G2 in 2002. Two years ago my wife took some with her Samsung phone, and I managed to get a few with my 5D2 from an aeroplane below the Helsinki latitude!

Nevertheless, chances for nailing nice and bright, full-sky Northern Lights get /hugely/ better if I drive 800-1000 km North to get above the Arctic Circle. There, you get on average up to 200 nights per year of Auroras.

Link | Posted on Dec 15, 2017 at 19:23 UTC
In reply to:

Greg VdB: All fine with me, as long as Roger Cicala keeps having enough time to produce his fabulous test reports.

Roger, I think you should make "QA and testing Czar" your official title!

Link | Posted on Dec 7, 2017 at 07:26 UTC
In reply to:

semorg: a nice and informative writeup!
There is a lot of unit variations with Samyang 14/2.8. I ordered like 4 and one was perfect. That copy is very sharp edge to edge. There is vignetting at 2.8. But I tested it on my book case and it has amazing resolving power to extreme edge. What it lacks is nice coating and a strange color tint.

Why would you want a strange color tint?

Link | Posted on Dec 2, 2017 at 21:35 UTC
In reply to:

Barlowephoto: Where did Dale go, ( how FAR north ) to get these beautiful images?????????????

Northern Norway, Sweden and Finland are all good, and located nicely to each other.

Link | Posted on Dec 1, 2017 at 18:55 UTC
On article UPDATED: Sony a7R III is still a star eater (471 comments in total)
In reply to:

Henrik Herranen: Umm, if the graphs are correct, the attenuation at fs/2 (Nyquist) is about 1.5 dB when compared to DC. This should hardly be visible in images. Then again, the image/video community uses the decibel scale incorrectly in so many imaginative ways (starting from the very incorrect definition of PSNR), so for all I know these dB numbers could just as well be potatoes.

(Short rant: if an audio signal's amplitude is halved, the power of the signal is lowered by a factor of 4, or approximately by 6 dB. But if an image RAW sample value is halved, power of the signal is lowered only by a factor of 2, or approximately by 3 dB. But, everywhere in the video industry people are using the dB scale incorrectly, using the incorrect assumption that a ratio of 1:2 is -6 dB, and not -3 dB as it should be. End of rant.)

Dear User9362470513, if you go to a party and run into a passionate discussion you are not interested in, do you move on until you find something better suited for you, or do you also there start crapping on the discussion? Sheesh to yourself.

Link | Posted on Nov 22, 2017 at 14:17 UTC
On article UPDATED: Sony a7R III is still a star eater (471 comments in total)
In reply to:

Henrik Herranen: Umm, if the graphs are correct, the attenuation at fs/2 (Nyquist) is about 1.5 dB when compared to DC. This should hardly be visible in images. Then again, the image/video community uses the decibel scale incorrectly in so many imaginative ways (starting from the very incorrect definition of PSNR), so for all I know these dB numbers could just as well be potatoes.

(Short rant: if an audio signal's amplitude is halved, the power of the signal is lowered by a factor of 4, or approximately by 6 dB. But if an image RAW sample value is halved, power of the signal is lowered only by a factor of 2, or approximately by 3 dB. But, everywhere in the video industry people are using the dB scale incorrectly, using the incorrect assumption that a ratio of 1:2 is -6 dB, and not -3 dB as it should be. End of rant.)

HFLM: Thanks to you, too. A 2x2 median filter would surely make one-pixel stars disappear.

Link | Posted on Nov 21, 2017 at 21:31 UTC
On article UPDATED: Sony a7R III is still a star eater (471 comments in total)
In reply to:

Henrik Herranen: Umm, if the graphs are correct, the attenuation at fs/2 (Nyquist) is about 1.5 dB when compared to DC. This should hardly be visible in images. Then again, the image/video community uses the decibel scale incorrectly in so many imaginative ways (starting from the very incorrect definition of PSNR), so for all I know these dB numbers could just as well be potatoes.

(Short rant: if an audio signal's amplitude is halved, the power of the signal is lowered by a factor of 4, or approximately by 6 dB. But if an image RAW sample value is halved, power of the signal is lowered only by a factor of 2, or approximately by 3 dB. But, everywhere in the video industry people are using the dB scale incorrectly, using the incorrect assumption that a ratio of 1:2 is -6 dB, and not -3 dB as it should be. End of rant.)

Thanks, DSPographer.

Link | Posted on Nov 21, 2017 at 19:43 UTC
On article UPDATED: Sony a7R III is still a star eater (471 comments in total)
In reply to:

Henrik Herranen: Umm, if the graphs are correct, the attenuation at fs/2 (Nyquist) is about 1.5 dB when compared to DC. This should hardly be visible in images. Then again, the image/video community uses the decibel scale incorrectly in so many imaginative ways (starting from the very incorrect definition of PSNR), so for all I know these dB numbers could just as well be potatoes.

(Short rant: if an audio signal's amplitude is halved, the power of the signal is lowered by a factor of 4, or approximately by 6 dB. But if an image RAW sample value is halved, power of the signal is lowered only by a factor of 2, or approximately by 3 dB. But, everywhere in the video industry people are using the dB scale incorrectly, using the incorrect assumption that a ratio of 1:2 is -6 dB, and not -3 dB as it should be. End of rant.)

It's no different than discussing film grain or film colour reproduction in numerical terms. With audio, numerical data, like frequency responses, THD+N numbers etc have been with us for at least a century. If you don't understand numbers, or don't care about them, how about just ignoring them?

Link | Posted on Nov 21, 2017 at 19:24 UTC
On article UPDATED: Sony a7R III is still a star eater (471 comments in total)

Umm, if the graphs are correct, the attenuation at fs/2 (Nyquist) is about 1.5 dB when compared to DC. This should hardly be visible in images. Then again, the image/video community uses the decibel scale incorrectly in so many imaginative ways (starting from the very incorrect definition of PSNR), so for all I know these dB numbers could just as well be potatoes.

(Short rant: if an audio signal's amplitude is halved, the power of the signal is lowered by a factor of 4, or approximately by 6 dB. But if an image RAW sample value is halved, power of the signal is lowered only by a factor of 2, or approximately by 3 dB. But, everywhere in the video industry people are using the dB scale incorrectly, using the incorrect assumption that a ratio of 1:2 is -6 dB, and not -3 dB as it should be. End of rant.)

Link | Posted on Nov 21, 2017 at 19:10 UTC as 74th comment | 15 replies
In reply to:

Richt2000: Now that SD cards come in such enourmous sizes you only ever need the one (or 2 for a dual slot) in your camera.

Fail.

Albert: Fair enough.
Dheorl: True.

Link | Posted on Nov 13, 2017 at 10:42 UTC
In reply to:

Richt2000: Now that SD cards come in such enourmous sizes you only ever need the one (or 2 for a dual slot) in your camera.

Fail.

Albert Valentino: You didn't lose your data when you (quick) formatted your card. It was only destroyed when you started writing new files. Rescuing files from an SD card is a simple process when you know what the data is supposed to look like; you don't need any of the file structure intact. Just look for JPEG/RAW headers and assume everything between headers is valid data. Years ago, when I needed to rescue files I'd accidentally deleted, I wrote a little rescue program of my own that did just this. It was less than 100 lines of standard C code, and was able to rescue over 95% of the deleted images (= all files that weren't fragmented).

Link | Posted on Nov 13, 2017 at 10:24 UTC

I like to draw cats:
https://affinelayer.com/pixsrv/
->
http://iki.fi/leopold/tmp/170223_Kissa/

Link | Posted on Oct 22, 2017 at 17:06 UTC as 25th comment | 2 replies
In reply to:

Henrik Herranen: "comes with a 13mm f/2.8 equivalent lens"

So, considering the crop factor of a 1/2.3" sensor is 5.6, the lens is about 2.3mm f/0.5? Really?

Simon: Wrong.

Link | Posted on Oct 15, 2017 at 18:34 UTC

"comes with a 13mm f/2.8 equivalent lens"

So, considering the crop factor of a 1/2.3" sensor is 5.6, the lens is about 2.3mm f/0.5? Really?

Link | Posted on Oct 14, 2017 at 19:24 UTC as 8th comment | 6 replies
In reply to:

Henrik Herranen: Thanks for a proper Throwback Thursday article after a few weeks of ho-hum two-liners!

Still, I must say that you may have made a mistake by dissing other G series cameras because of their body colour. I've owned or had extensive access to all G series cameras between G1 and G6, and G5 was the only camera where things devolved... until the G7 where everything was foobared.
- G1: The original, 3 MP, ISO 50 yeah man!
- G2: 4 MP, sensor changed from CMY to RGB, much better reds.
- G3: Same sensor, but better lens.
- G5: Noisy 5 MP sensor, gave much credence to the now-refuted notion that more MP = worse image quality. Hurt me personally, because I bought one for my sister and noticed the IQ deficit only after buying the camera abroad and couldn't return it.
- G6: 7 MP = lots of MP, less noise, everything's good again!
- G7: WHAT? Slow lens, no vari-angle LCD? No, this is not a G series camera, forget it!

The G series found itself again a few years later, but WHAT happened with the G7?

guyfawkes: I understand completely your sentiments.

Link | Posted on Oct 13, 2017 at 20:19 UTC

Thanks for a proper Throwback Thursday article after a few weeks of ho-hum two-liners!

Still, I must say that you may have made a mistake by dissing other G series cameras because of their body colour. I've owned or had extensive access to all G series cameras between G1 and G6, and G5 was the only camera where things devolved... until the G7 where everything was foobared.
- G1: The original, 3 MP, ISO 50 yeah man!
- G2: 4 MP, sensor changed from CMY to RGB, much better reds.
- G3: Same sensor, but better lens.
- G5: Noisy 5 MP sensor, gave much credence to the now-refuted notion that more MP = worse image quality. Hurt me personally, because I bought one for my sister and noticed the IQ deficit only after buying the camera abroad and couldn't return it.
- G6: 7 MP = lots of MP, less noise, everything's good again!
- G7: WHAT? Slow lens, no vari-angle LCD? No, this is not a G series camera, forget it!

The G series found itself again a few years later, but WHAT happened with the G7?

Link | Posted on Oct 12, 2017 at 21:34 UTC as 30th comment | 4 replies
In reply to:

faithblinded: WTH Metabones. 0.5x for a dead system, but you can't figure one out for micro four thirds? It's the system that makes the most sense for a .5x converter. With the 2x crop factor, ff lenses could be used at their native field of view. Yes please!

I'm only guessing here, but could it be they'd have problems with the corners if adapting FF lenses to m43 with a 0.5x booster? In this application only a tiny fraction of the center of the lens' image circle is used.

Link | Posted on Oct 11, 2017 at 06:58 UTC

"bypartisan"?

Link | Posted on Oct 6, 2017 at 20:19 UTC as 11th comment | 1 reply
On article Throwback Thursday: Sigma SD1 (237 comments in total)
In reply to:

Henrik Herranen: "Foveon sensors capture color in a completely different way than Bayer sensors, with each 15MP layer capturing a primary color."

I'm afraid this is incorrect. Sigma would like you to believe othewise, but the layers don't capture primary colours, but a somewhat blueish, a somewhat greenish, and a somewhat reddish colour. Examine the RAW files if you don't believe me. There's not nearly as much colour separation as there is on a Bayer sensor. This is at least part of the reason for Foveon's high-ISO colour blotches. Even though it isn't interpolating spatially, it is extrapolating chromatically.

I don't want to take anything out of Sigma's achievements. The Foveon sensor is a unique idea, and Sigma's Art lenses are wonderful (I have the 50/1.4A, and MAN!). I love the company for its innovations! But, the turth of it is that Foveon sensors for sure don't capture three primary colours as such.

Scottelly: Anyone caring about the truth vs lies does care. As much as I respect Sigma for their very affordable super lenses (I own the 50/1.4A and it's magic), I despise their Foveon marketing, which, honestly, is based on straight lies.

I work in audio industry, and I am an expert in audio signal processing. In my profession I have to fight against similar lies and misdirections on a constant basis. After 20 years it gets really tiresome to fight against the very same lies, perpetrated over and over again by publishers and web authors alike. That's why I really hate the Foveon lie. It is a purposeful lie, sold hook, line and sinker to even respectable publications, like DPreview, which I othewise like so much.

Link | Posted on Sep 28, 2017 at 19:14 UTC
Total: 382, showing: 1 – 20
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