E Dinkla

Lives in Netherlands Netherlands
Works as a Printer
Joined on Mar 30, 2009

Comments

Total: 43, showing: 1 – 20
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On article Fotodiox LED100WB-56 quick review (54 comments in total)
In reply to:

Julia Borg: CRI does not characterize LEDs well enough. have you tried measuring SPD?

For a guide on CRI - CQS etc standards:
http://www.olino.org/us/articles/2015/03/07/color-quality-scale-cqs-measuring-the-color-quality-of-light-sources
BTW the Olino.org measurements of lamps give you way more information to draw conclusions on light source characters.

Met vriendelijke groet, Ernst

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
November 2016 update, 700+ inkjet media white spectral plots

Link | Posted on Jan 18, 2017 at 09:24 UTC
In reply to:

HowaboutRAW: Re, image 8 caption: What are "snow particles"?

Are they a product of nuclear plants? Or coal plants?

Or is it just that a non-native speaker of English wrote the caption?

After reading your explanation and living in The Netherlands at the border of Belgium I will sleep a lot better. Now they only have to sort out the small cracks in the reactor rings :-)
https://en.wikipedia.org/wiki/Nuclear_energy_in_Belgium
Interesting term there; Hydrogen Flakes.

Converted cooling tower:
https://www.wunderlandkalkar.eu/nl

BTW, I guess image 10 shows the top of the floating deck, the gas is underneath that part. Weights on the deck are there to keep the gas pressure at a certain level, main weight is the concrete ring along the wall.

Link | Posted on Nov 6, 2016 at 10:30 UTC
In reply to:

miles green: And what's with the huuge hood on a pancake lens!? Something like the Pentax 21mm limited would have been a much better design.

Yup, the rectangle window sunshade like used on the 21mm would be better. Long ago I have seen a hood like that described as a Meissner Blende but no google confirms that name. I have been experimenting to create shades like that by stacking empty filter rings + a (rounded) rectangle mask in the top one. Plus the possible use of a filter on top of that as there is still a filter thread open then. As I understand it using a filter + the Pentax hood creates some issues.

Link | Posted on Oct 20, 2016 at 08:23 UTC

More or less a true Plasmat lens for FF. I guess that between the first version and this one less than 5 Plasmat designs were introduced for FF, by any company. The Canon EF 40mm 2.8 is more a hybrid Planar/Plasmat. Performance/price wise the Canon is the one to beat. Sure it is another focal length. Small mirrorless cameras, with improved high ISO quality sensors, could use small, slower lenses and by that ask for optical designs like the Plasmat, Heliar and Tessar. The image quality of modern Plasmat + hybrids is probably preferred above the Tessar variations. I guess little optical design changes of the original Summaron could go unnoticed in a lens diagram but show a much better image quality in practice.

http://www.klassik-cameras.de/Canon_Wideangles.html

Link | Posted on Oct 20, 2016 at 07:29 UTC as 27th comment
In reply to:

johnsmith404: Since people were asking, at a CP+ presentation the Sigma CEO has explicity stated that Canon, Tamron and Tokina lenses are not supported by this adapter (the LED shouldn't even turn on).

Depends on a possible agreement with Sony and/or Canon which I doubt exists at all. I guess Sigma has a qualified software department with a thorough knowledge of Sony, Sigma, Canon and Nikon camera protocols based on reverse engineering. They must be aware what is covered in patents too. Metabones and other third party adapter makers were welcome for Sony to establish the FE mount cameras in the market and make the switch for all DSLR customers easier. It becomes something else if a third party lens maker gets an easy entrance. Supporting Sigma + Canon lenses as well on all the focusing features is probably too much asked for happy faces at all the involved marketing departments. Right now Sigma is the winner. Anything beyond is hacker's territory and could be within legal limits or not just.

Met vriendelijke groet, Ernst Dinkla

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
January 2016 update, 700+ inkjet media white spectral plots

Link | Posted on Mar 9, 2016 at 12:52 UTC
In reply to:

johnsmith404: Since people were asking, at a CP+ presentation the Sigma CEO has explicity stated that Canon, Tamron and Tokina lenses are not supported by this adapter (the LED shouldn't even turn on).

A USB connector and nobody will try to hack more functionality to that adapter? Unlikely.

Met vriendelijke groet, Ernst

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
January 2016 update, 700+ inkjet media white spectral plots

Link | Posted on Mar 7, 2016 at 16:07 UTC

There is of course a mirrorless solution possible where EF lenses play a role and a smaller than 44mm flange to sensor distance can be created. Sure there are advantages in using a Sony + EF-FE adapter but the total did not reduce the 44mm flange to sensor depth measured from the EF flange. A focal length reducer integrated in the camera can be designed way more optimal to image quality, sensor size, than one that has to function in between existing lens/camera designs both from different manufacturers. Three parties involved right now for that solution. The sensor size does not have to be FF or APS but the size should result from weighing all aspects and sound optical design decisions. It has been on my mind for some time:
http://www.dpreview.com/forums/post/57163063

Met vriendelijke groet, Ernst

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
January 2016 update, 700+ inkjet media white spectral plots

Link | Posted on Mar 4, 2016 at 10:40 UTC as 13th comment
In reply to:

E Dinkla: Mamiya Six folder camera was probably the first camera with a film plane focusing system. Not AF though but a patent on film plane focusing must have expired, the camera is at least 60 years old.

Ernst Dinkla

The film in that camera moves within the camera body to focus while the lens is a rigid part of the body (though being a folder camera the lens can be folded into the body).

Ernst Dinkla

Link | Posted on Feb 13, 2016 at 19:10 UTC

Mamiya Six folder camera was probably the first camera with a film plane focusing system. Not AF though but a patent on film plane focusing must have expired, the camera is at least 60 years old.

Ernst Dinkla

Link | Posted on Feb 12, 2016 at 18:12 UTC as 26th comment | 3 replies

Good concept for AF in macro work with bellows. Between the camera mount and the bellows after the main focusing has been done manually. Moving the camera instead of the lens. Auto focus stacking should be possible too then, about 4 mm movement I read some weeks ago, DPreview is late with this news. Wonder though whether the M mount side hole is wide enough in that case and I guess there are not that many bellows with M mount at the back. Adding another adapter is not the way to go, so give us the same AF part with a more common bellows mount. If used with auto aperture lenses a wire link from adapter to lens is welcome too. Not impossible as I made one already between an EF-FD adapter and a reversed EF mount macro lens at the other end of an FD bellows. But the adapter should get Sony aperture control then. My DIY work was the reason why I thought a year ago that an AF module between camera and bellows would be handy. Well it is there more or less.

Met vriendelijke groet Ernst Dinkla

Link | Posted on Feb 12, 2016 at 10:13 UTC as 36th comment

What happened to the $ : £ ratio going from 21mm to 50mm?

Ernst Dinkla

Link | Posted on Sep 23, 2015 at 12:01 UTC as 11th comment
In reply to:

photo perzon: most stupid waste of press -- like a car that wont take you because already people are there

What a great idea. Could be nice in summer when half the population goes to the beach and your car drives you to the least crowded one. For the environment it could be good too, forcing public transport use to places that are already overloaded.

I think the Restricta hit some veins in the DPreview crowd.

Link | Posted on Sep 11, 2015 at 09:43 UTC
In reply to:

Top Dog Imaging: If you've ever used a 4-shot Sinar or Hasselblad back, you will be amazed by the difference. The big advantage is no bayer interpolation--much better than a Foveon sensor. My guess is the new sensor will be 20 MPs, hence 40 MP resolution from 8-shots. This may be a game-changer for product, reproduction, and architectural photographers. Furthermore, the capability of mounting an Oly body onto a Cambo Actus opens the system up to infinite possibilities.

Strange that DPreview mentions Hasselblad while Sinar introduced that feature more than a decade ago and made improvements on it since.

Link | Posted on Dec 5, 2014 at 15:31 UTC
On article Portrait Salon 'rejects' exhibition opens in London (62 comments in total)

The 2013 National Portrait Gallery had a high portion of "Rineke Dijkstra" esthetic content, wonder whether that is also found in the 2014 exhibition. Maybe the first rejected sample shown was on the edge of being accepted then.

Time will tell which art lasts anyway:
http://en.wikipedia.org/wiki/Salon_des_Refus%C3%A9s

Ernst Dinkla

Link | Posted on Nov 7, 2014 at 09:29 UTC as 7th comment | 2 replies
In reply to:

pellicle: you know that Canon has plateaued out when you see this sort of release. Great innovation there guys

Ten steps more on the route from Canon to Sony.

Link | Posted on Sep 27, 2014 at 10:00 UTC
On article Olympus patent describes Google-Glass-like device (14 comments in total)
In reply to:

Turbguy1: I have been waiting for a wearable viewfinder for a decade! Why not bluetooth it to a "real" cam??

Even asked for it to happen in forums.

Link | Posted on Jun 7, 2014 at 09:33 UTC
On article Roger Cicala investigates accuracy of lens adapters (49 comments in total)

The method I used is buying inexpensive but rigid adapters and tweak them for one lens so infinity is correct and image quality fall off to the sides is more or less equal. And keep that adapter fixed on that lens. This is not in conflict with Roger's findings. On M4/3 so far and with low weight C-mount lenses so even more within a safety zone. Despite that, two identical lenses gave different results. Most that go this route will use older and often secondhand lenses with different histories. There will always be a lottery aspect in this approach but it can be quite rewarding. Not just in a nice image quality but also to slow down your picture taking and manual focusing, aperture priority shots often deliver my best images.

Ernst Dinkla

Link | Posted on Oct 2, 2013 at 09:10 UTC as 10th comment

Why can I not get the same 9.99 Euro deal based on my existing Premium Design CS 5.5 license ? Because Adobe thinks this loyal guy could afford that more expensive package (including Photoshop 5.5, Bridge and more) and its upgrades so we are not going to offer him a deal like that. He has to bleed for going to a Photoshop CC only package or more with Lightroom included or really suffer for a big CC package that does not even contain Lightroom. No way.

Link | Posted on Sep 10, 2013 at 12:46 UTC as 47th comment | 1 reply

Harman (Ilford Photo and more) so far made better marketing moves after the split than Ilford Imaging did. This will be another example I expect. A relative small company filling a market niche with their own proven technology and the right brand name to attract customers. Fuji made some new medium format film cameras and has a chromogenic B&W film but it is probably too big for a similar undertaking. Offering the B&W silver halide print service next to the B&W film development rounds it off.

Link | Posted on Sep 2, 2013 at 07:55 UTC as 44th comment
Total: 43, showing: 1 – 20
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