JensR

Lives in United Kingdom Bath, United Kingdom
Works as a Mechanical Engineer
Joined on Nov 23, 2003
About me:

Hi,

thanks for stopping by!
If you want to see what I'm up to, send me a message :)

My 'plan':
Talk Pentax into a digital Electro-Spotmatic! (This needs some work...)

-------------

Older Signatures:

'LBA knows no bounds, and seeks no justification...' (Jim King, 2005)
http://www.jr-worldwi.de/photo/index.html - Photography, Tech and Geek stuff :}

'Why is everyone answering rhetorical questions?' (Me, 2005)

'Well, 'Zooming with your feet' is usually a stupid thing as zoom rings are designed for hands.' (Me, 2006)

'I only trust those photos I have faked myself.' (Me, 2007)
http://www.jensroesner.de/

--=! Condemning proprietary batteries since 1976 !=--

'I don't want them to believe me, I just want them to think.'
Marshall McLuhan

Comments

Total: 453, showing: 1 – 20
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In reply to:

PowerG9atBlackForest: Apart from forensic sciences, what is wrong with taking (tampered) photographs as they are?
Good fun/marvel at the picture at best. Does one have to know the "truth"?

> is pretty much close in my book.

Not in mine and hence we won't reach an agreement.

Link | Posted on Jun 29, 2018 at 11:31 UTC
In reply to:

Alex Sarbu: The K-50 also has KAF4 support via a firmware update. Is it missing from the list a mistake, or there is some other issue?

If you give a list of compatible cameras, the K50 should probably be included, that's all that matters. The leave it to K50 owners to make the decision.

Link | Posted on Jun 29, 2018 at 11:29 UTC
In reply to:

Richard in UK: Went in to my local 'Jessops' hoping to handle the Pentax K1ii, but was told they no longer stock it; they're only available in the London store.

My first camera was a Pentax Spotmatic which was brilliant. Whilst I certainly have a 'soft spot' for Pentax, this does feel like £1000 of my money well spent.

We all (even Pentax fans) have to move on; If you're likely to be taking photographs in ten year's time; then this isn't a sound investment.

I am guessing that SRS Microsystems sells 80% of high-level Pentax gear in the UK. It is sad but not surprising that Jessops is not stocking K1 cameras in satellite stores.

Link | Posted on Jun 29, 2018 at 11:19 UTC
In reply to:

PowerG9atBlackForest: Apart from forensic sciences, what is wrong with taking (tampered) photographs as they are?
Good fun/marvel at the picture at best. Does one have to know the "truth"?

Photography is not just an art, it is also documentary. Which mixture a photo should have depends on the context. I appreciate a good dose of documentary in my advertisements.
I am baffled that badi would even compare two photos from different locations at different times to manipulating advertisement photos. Everybody knows that when they look at a photo, that clouds can be there, that it can be dark or bright or winter or summer. That is NOT the same as removing ugly buildings or cloning in palm trees.

Link | Posted on Jun 29, 2018 at 11:02 UTC
In reply to:

JensR: Not sure why you picked the 58mm, when multiple lenses are covered.
The patent is very interesting from a technical point of view and it seems this would be the first application in an AF lens?
Would be nice to link to the source/patent.
And combining this rather complicated focus arrangement with the zoom function is probably of even more technical interest than in the prime lenses.

good point! I couldn't find a detailed description of the Minolta process. Looking at the sample photos, it looks as if it might be a similar way to increase spherical aberrations. I'm sure the Canon patent does something new, which just furthers my point that I would like a more detailed technical discussion of this technology.

Link | Posted on Jun 29, 2018 at 10:55 UTC
In reply to:

Tungsten Nordstein: Great, but please can we stop calling this stuff AI? It isn't.

Tungsten, falconeyes has literally stated that right at the beginning:
https://www.dpreview.com/news/5039410137/adobe-ai-spots-tampered-images-by-focusing-on-noise-and-artifacts?comment=1541600109
There is nothing more to it: "Artificial Intelligence" is an established term by now and the work here meets that definition.

> "as I understand the term AI"
If you disagree with how that term is defined, that's another discussion. But if you don't understand its definition, you can read up on it.

And whether or not you are a "victim" or feel like one, your objection is exactly what is described in the Wikipedia effect on the "AI effect".

Link | Posted on Jun 28, 2018 at 19:19 UTC
In reply to:

HeyItsJoel: I read somewhere that 58mm more accurately depicts a 'normal' human eye FOV than the standard 50mm. Is this true?

dpreview linked a good article a while ago:
https://www.theatlantic.com/technology/archive/2018/05/how-the-50-mm-lens-became-normal/560276/

I personally like a variation of a phrase I read years ago: Human vision is a very good tele lens merged with a decent "normal" and a poor wideangle.
If you are standing at some scenic lookout and gaze out into the wide open landscape, brain&eye create a very different feel than when you try to decipher tiny print...

Link | Posted on Jun 28, 2018 at 19:13 UTC

Not sure why you picked the 58mm, when multiple lenses are covered.
The patent is very interesting from a technical point of view and it seems this would be the first application in an AF lens?
Would be nice to link to the source/patent.
And combining this rather complicated focus arrangement with the zoom function is probably of even more technical interest than in the prime lenses.

Link | Posted on Jun 28, 2018 at 19:08 UTC as 21st comment | 2 replies
On article First Impressions: Sony FE 400 F2.8 GM OSS (479 comments in total)
In reply to:

Abel89er: While I see the appeal of a fast wide sub 500$, there's the sony 28 2.0 which is really close and you can crop a bit with current bodies.

Maybe a 21 2.8 sub 700 dollars is more needed, a 24 1.4, 500 f4, 200-600 f5.6... there are always gaps one can fill ;p

When the A9 came out, people complained that Sony had no pro sports lens. Now they have one (or two, I don't know) and they can work towards filling whatever gaps they might have in their line-up.

Link | Posted on Jun 27, 2018 at 18:12 UTC
On article First Impressions: Sony FE 400 F2.8 GM OSS (479 comments in total)
In reply to:

justmeMN: I'm so old, that I remember when mirrorless enthusiasts touted compact size as a key benefit of mirrorless. :-)

I think this is the smallest 400/2.8 & camera combo that is able to do 20FPS.

Link | Posted on Jun 27, 2018 at 18:09 UTC
On article First Impressions: Sony FE 400 F2.8 GM OSS (479 comments in total)

Edit: already covered before me: https://www.dpreview.com/articles/1870760563/first-impressions-sony-fe-400-f2-8-gm-oss?comment=5996147871

"These wide open shots in particular display beautiful background separation, with lovely bokeh, thanks in part to an 11-blade circular aperture. "

Most lenses I know have no aperture blades "optically active" when wide open. I have a one or two zoom lenses where (at the wide end, IIRC) the aperture blades are in the optical path, but for a prime lens, the quoted statement should be irrelevant: When you are wide open, the shape and number of aperture blades should be irrelevant to the bokeh.

Link | Posted on Jun 27, 2018 at 18:08 UTC as 46th comment
In reply to:

Tungsten Nordstein: Great, but please can we stop calling this stuff AI? It isn't.

@falconeyes
I was being facetious when I said it's okay, sorry, need to use the sarcasm tag ;)
Totally agreed - it can make discussions impossible.

Link | Posted on Jun 26, 2018 at 13:58 UTC
In reply to:

PowerG9atBlackForest: Apart from forensic sciences, what is wrong with taking (tampered) photographs as they are?
Good fun/marvel at the picture at best. Does one have to know the "truth"?

badi, how is that relevant here?
And I am not talking about removing a pothole or a beach chair, Tommi, or something obviously fake.
If neither of you cannot come up with a non-forensic example of why photo manipulation can be bad (advertising products or destinations was my example), then the manipulators have already won.

Link | Posted on Jun 26, 2018 at 12:57 UTC
In reply to:

mike80: 120 film is not 120mm.

Tommi, rounding 120 film up to the nearest cm is common practice and your nitpicking doesn't help the discussion.

Link | Posted on Jun 26, 2018 at 12:54 UTC
In reply to:

Tungsten Nordstein: Great, but please can we stop calling this stuff AI? It isn't.

Tommi, if you want to have your own definition of AI, that is okay, but it will get confusing, so I prefer the established definition.

Link | Posted on Jun 26, 2018 at 12:52 UTC
In reply to:

PowerG9atBlackForest: Apart from forensic sciences, what is wrong with taking (tampered) photographs as they are?
Good fun/marvel at the picture at best. Does one have to know the "truth"?

Not sure what you are talking about Tommi. Cheers.

Link | Posted on Jun 26, 2018 at 11:38 UTC
In reply to:

Tungsten Nordstein: Great, but please can we stop calling this stuff AI? It isn't.

Artificial intelligence is not human intelligence (for now anyway ;) ) and more importantly human consciousness. I think this is why in every article that uses the term AI, someone comments that it is not.

Link | Posted on Jun 26, 2018 at 11:14 UTC
In reply to:

PowerG9atBlackForest: Apart from forensic sciences, what is wrong with taking (tampered) photographs as they are?
Good fun/marvel at the picture at best. Does one have to know the "truth"?

Do you want the travel destination photos that you might base your holiday decision on to be tampered with?

Link | Posted on Jun 26, 2018 at 11:11 UTC
In reply to:

boarderphreak: Vertical video? In IG's tiny little format? Yeah, no...

Jack, that is of course the idea. Film vertically, watch vertically. No letterboxing, full screen = video.

Link | Posted on Jun 21, 2018 at 18:43 UTC
In reply to:

JensR: How are they going to assess whether a video is vertical or horizontal? And if someone uploads a horizontal video, will it get blocked?

Thanks Bryan, that is interesting. The disobedient nerd in me wants to mess with the metadata to trick the app into thinking the horizontal video is vertical. Probably would get me banned though :-O

Link | Posted on Jun 21, 2018 at 18:42 UTC
Total: 453, showing: 1 – 20
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