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Karl Gnter Wnsch

Karl Gnter Wnsch

Lives in United States AK, United States
Works as a software developer
Joined on Jun 24, 2002

Comments

Total: 92, showing: 1 – 20
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On Travel tripods: 5 carbon fiber kits reviewed article (81 comments in total)

I bought a Feisol CB-40D head about 3 years ago. To call it "unrefined" would be flattering it considerably. It's a rough, uneven gripping grease filled metal pod.
Since I recently got a really good head from another company and thus don't need the CB-40D anymore, I took the head apart. It's a real mess inside, many manufacturing tolerances are simples greased away - and since the grease has changed properties over time and now is rather amber like in mine the head has changed in properties.
Where once you couldn't lock down the panorama plate now you practically can't unlock it anymore. It still holds insane weights at an angle but to start a panning movement requires strong and incalculable amount of force (book your place in a fitness studio and work out those biceps), while panning it will almost lock down on it's own.
And always bring a big forceps along on your travels, if you inadvertently turn the friction setting while the head is locked you will need them...

Direct link | Posted on Jul 28, 2014 at 11:04 UTC as 30th comment
On Is it true? New service detects processed photos article (88 comments in total)

I only see some sense if you need to prove that something is shown as is - like if you are documenting a crime scene or insurance claim. Then this function could supplement something like the image data verification data which Canon DSLR can add to any photo taken...

Direct link | Posted on May 7, 2014 at 09:59 UTC as 34th comment
On Sony SLT-A77 II First Impressions Review preview (632 comments in total)
In reply to:

Bob Janes: That wider focus area will be much appreciated on an a99 MkII..

@Azurael,
it's the other way around, the basic design of the AF module is geared up for full frame cameras, the same modules in a APS-C just makes better use of the same area coverage - and it covers as much area as is physically possible if you don't want to restrain the lens speed to be better than f/4 or even f/2.8 for the AF to work at all... So if you want to have lenses with a best aperture of f/5.6 to be able to use AF then you will have to live with that kind of area covery you got today...

Direct link | Posted on May 1, 2014 at 23:08 UTC

Yeah, so A-mount is still alive... not! They could have easily made that lens work on A-mount as well with matching/dedicated adapter for E-mount (a telephoto lens has no need whatsoever for a short registration distance, it brings no technical benefits) but no, they had to make it E-mount. So Alpha-DSLR/DSLT users brace, your system is on the chopping block...

Direct link | Posted on Feb 12, 2014 at 13:29 UTC as 3rd comment
In reply to:

samfan: When I was picking my DSLR brand in 2006, I chose Nikon over Canon. One of the reason was that Nikons always perfectly worked with 3rd party lenses, unlike Canon which used to have constant focusing problems with Sigma lenses.

And for years I've been using 3rd party lenses without problem, happy with picking Nikon.

Today? Screw Nikon. Most my favorite lenses are Sigmas. Honestly I'll rather switch to the Sigma SD1 than buy another Nikon DSLR and not be able to use lenses such as 50-150/2.8, 30/1.4 or 8-16mm. Especially since Nikon completely dumps on DX users and doesn't provide any alternative to these.

I also bought a V1 since there's nothing else like it but it's gonna be a cold day in hell when I buy a FT1 only for overpriced Nikon lenses.

Well you chose the system for all the wrong reasons... It wasn't Canon who did something wrong, it was Sigmas fault back then and it again is Sigmas fault today because they chose not to license the respective specifications but rather reverse engineer them, which is going to be prone to omissions due to as of yet unused but well specified features within the internal standard of cameras and lenses of the OEM...

Direct link | Posted on Nov 20, 2013 at 15:10 UTC
On Tamron to develop 150-600mm F5-6.3 ultra-telephoto zoom article (193 comments in total)
In reply to:

Hadarmil: Frankly, I'd give up some mm on both ends if they could make a faster super tele zoom. Oh, and keep it for crop sensors. We still don't have fast super telezooms for crop which would probably make them cheaper and lighter.
Maybe Sigma will understand the market hole(as they occasionally do) and act to fill it. Right now I doubt the Tamron will be as good and cost effective to become a serious success for serious photogs. feels more in line like the old tactics of shoving larger unusable focal lengths to catch press attention. 200-500 f/4 sounds a little better even if you can't upgrade with it to FF.

Heck, why doesn't anyone make a crop fast prime? A sharp 2.8 300 for crop will get my money and probably a lot of others'.

Rant rant rant. Sure do hope I'm wrong.

At the long end the lens speed dominates the size of the lens - from about 100mm onwards the image circle is so big that it can more than cover a full frame sensor. For a smaller sensor you would need to add additional internal baffling to reduce stray light entering the mirror chamber of the camera.
Telephoto lenses neither get cheaper nor do they get lighter for crop sensors!

Direct link | Posted on Nov 8, 2013 at 10:13 UTC
On Tamron to develop 150-600mm F5-6.3 ultra-telephoto zoom article (193 comments in total)

Why not make it f/5.6 at the long end, then at least all focusing systems would be within their working range! At f/6.3 nobody should buy this lens as it will not focus reliably on all but the top of the line DSLR...

Direct link | Posted on Nov 8, 2013 at 10:10 UTC as 21st comment | 5 replies
On Olympus OM-D E-M1 Review preview (2059 comments in total)

Why didn't you test the focusing performance in a more relevant scenario - where you use a tele zoom lens of 200 or 300mm length and not those piddly wide angle lenses? A big fail to put the finger on the sore wound that is focusing performance of this camera when challenged!

Direct link | Posted on Oct 29, 2013 at 13:23 UTC as 138th comment | 2 replies
On DxOMark tests Canon EOS 70D sensor and lenses article (133 comments in total)
In reply to:

InTheMist: I don't want my images to look accurate, I want them to look awesome.

Look, I'm a Nikon shooter, but I do find the Canon images very appealing. Who cares how scientifically accurate it is it is as long as it looks great?

Edit: As an engineer in test and measurement, I don't can't seriously fault DxO on a methodology front. Frankly, I think DxO has the most believable method.

@dual12, blooming has been a thing of the past - the last camera to really suffer from that phenomenon was the Nikon D70 and to a lesser extent the Nikon D50. Since then blooming hasn't been an issue on any brand! So you are talking plain rubbish!

Direct link | Posted on Sep 4, 2013 at 08:50 UTC
On DxOMark tests Canon EOS 70D sensor and lenses article (133 comments in total)
In reply to:

Eleson: " Of course, in return the 70D gains the most sophisticated live view AF system available on any SLR."
????
It got beaten by the a-77, and in my view, it deliveres better live view AF than 70D.

What is the rationale behind the statement above??

@Eleson,
the A77 video autofocus is useless for video if you want to use your lens at anything else but f/3.5 or wide open, whichever of the two are worse! So want to shoot at f/10 - no autofocus. Want to shoot at f/1.8 with your fast lens - no autofocus!

Direct link | Posted on Sep 4, 2013 at 08:47 UTC
On DxOMark tests Canon EOS 70D sensor and lenses article (133 comments in total)
In reply to:

Abbas Rafey: I have never seen DXO saying any good about canon
Is it that bad
Or it is advertising for Sony sensors only.
I used both Nikon, canon and sigma
I can shoot with a,l the cameras without any noticeable difference only you need to know your camera and how tweak with it.

the only thing I have moved to canon is there superior focusing system.

No matter what is your sensor it is worthless if it cannot focus it fast.

@chj, then you heard wrong!

Direct link | Posted on Sep 4, 2013 at 08:44 UTC
On Olympus stems losses but PEN sales disappoint article (233 comments in total)
In reply to:

JM McInnes: Sasha B suggests that "Mirrors in camera are like cathode ray tubes in TVs, a real technological dinosaurs".
When image sensors achieve the same dynamic range as the human eye that may become true. For the moment, if you want an optical TTL viewfinder, you need a mirror. It may be a dinosaur, but the meteor hasn't hit Chicxulub yet.

@T3, negative films had about 8, with careful pummeling 10 EV dynamic range, well below what current sensors can capture... The problem is even the best EVF's only show about 5EV!

Direct link | Posted on Aug 12, 2013 at 08:14 UTC

Their measurements are so badly screwed - the 100mm f/2 USM lens better than the 100mm f/2.8L IS USM - there is something fishy going on here, and it stinks mighty badly!
I can only see one reason in their published data: They seem to take all aperture settings into account which a lens offers - and at f/22 (the maximum the 100mm f/2 can close it's aperture to) the diffraction of the sensor isn't as bad as on the 100mm f/2.8L IS USM where the lens can close to f/32.
So these guys basically are morons who have no clue what they do and should be barred from further producing this overload of measurement garbage! Please DPreview - do yourself a favor and drop them from your portfolio of partners, you're better off without them!

Direct link | Posted on Jun 18, 2013 at 09:12 UTC as 9th comment | 2 replies
In reply to:

Spectro: the image to the left looks like a canon, the one to the right looks like a nikon...oop wrong topic.

I am all for getting the highest DR like film. We can add contrast to and saturation if we wanted in post production. Just give us the most raw data possible. Engineers keep it up. Rambus is those guys that I remember suing other memory makers on ram.

Film has less DR than current sensors!

Direct link | Posted on Mar 12, 2013 at 10:28 UTC

The problem is the newly granted right to sublicense without compensation to you. You (dpreview that is) should compare the license agreements again, the previous rights are necessary to operate a service like Instagram, the new ones go far beyond what is necessary. If I were a DPreview regular previously using Instagram I'd scramble to pull all my content of their site. Fast!

Direct link | Posted on Dec 18, 2012 at 18:21 UTC as 30th comment
On Just deployed: New dpreview.com forums system article (699 comments in total)

I can't wait for the day when the wretched, unstable and misleading WISIWIG mode get's binned. The voting war malarchy doesn't help either and the lack of ability to contact the moderators and the lack of feedback from them doesn't make the situation any better! Please return sanity to the forum by binning the whole mess!

Direct link | Posted on Oct 14, 2012 at 08:17 UTC as 34th comment
In reply to:

Karl Gnter Wnsch: DNG is a seriously flawed concept - to try to press several hardware dependant formats like the different RAW file formats into a common mould is a complete misconception.
It was always lossy (even when it wasn't meant to be) and with every evolution step it got closer to the encompassed RAW formats - thus replacing several disjunct, well specified standards with a absolutely messy jumble of parts that DNG has become over time.

@Henry M. Hertz,
try to read the specification with regard to black level storage and evaluation. The first evolution steps mandated the removal of the covered rows of the sensor data an replacing them with a single calculated black level value. So converting your files to DNG would have lost you the status data about the column variances - leading to excessive banding which you only could tackle with stronger noise reduction instead of the proper solution of using the covered sensor cells as reference.
It now may contain this data but previously it didn't - if you converted the DNG with the old converter you have botched your RAW files.

Direct link | Posted on Oct 6, 2012 at 05:11 UTC
In reply to:

dbateman: This is good. I do hope more cameras come with DNG. I only know of Pentax now that has DNG. It would be great if all cameras had the choice of DNG. Then you don't have to upgrade your adobe software so often :)

DNG is one unholy mess of things - it has no place whatsoever in a camera!

Direct link | Posted on Oct 5, 2012 at 21:28 UTC

DNG is a seriously flawed concept - to try to press several hardware dependant formats like the different RAW file formats into a common mould is a complete misconception.
It was always lossy (even when it wasn't meant to be) and with every evolution step it got closer to the encompassed RAW formats - thus replacing several disjunct, well specified standards with a absolutely messy jumble of parts that DNG has become over time.

Direct link | Posted on Oct 5, 2012 at 21:27 UTC as 39th comment | 5 replies
On Coming soon: Lens Reviews to return to dpreview.com article (272 comments in total)
In reply to:

Jogger: How about DXO sensor measurements as well.. e.g. instead of factory default jpgs for testing dynamic range.

@Simon, sorry to hear that you are selling out. DPreview previously was the benchmark for independent reviews. By tying in with the DxO lot I feel that the independence is lost - because DxO Tests are nothing more than a marketing vehicle for their software products. I have yet to see a single test by them that is not marred by extensive and exhaustive procedural mistakes and flaws that make them complete and utterly irrelevant for real life photography.

Direct link | Posted on Oct 3, 2012 at 17:50 UTC
Total: 92, showing: 1 – 20
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