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Forum: Pentax News and Rumors
02-29-2024, 11:13 AM
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According to my wife I´m not a collector because most of these things are still in use. :cool:
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Forum: Pentax News and Rumors
02-28-2024, 04:20 AM
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Gave up making color prints (Cibachrome) years ago but made BW prints two weeks ago.
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Forum: Pentax News and Rumors
01-17-2024, 08:07 AM
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Regarding image quality: Last summer I was plaing with my old Leica IIIf with a pre-WWII lens and met a 16 year old kid. He was going to study media and communication and was interested in the camera, so I showed him and said that you don't get the same image quality as with a modern digital camera. His response was "Of course, that's the whole point".
Noone today will expect the extreme digital quality from a small format film camera. It is for fun, as a statement and/or because you want to do something slow and different.
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Forum: Pentax News and Rumors
09-22-2022, 04:37 AM
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Both may happen. Every patent has degrees of preferred embodiments, and examples that you use to widen the area around the patent stopping others from getting too close. You use the specification to publish what you don't want others to patent and the claims to stop others from making similar products. Of course the scope of the latter will often decrease during the prosecution, maybe ending up with the preferred embodiment while the surround area is maintained.
If your patent also covers embodiments that you don't intend to use you can licence them to someone else, possibly trading patents.
If you find a solution that, for example, can simplify internal focussing for a certain type of lenses of course you may want to use that several lenses. The examples in the patent are not limiting, you may choose to use patented solution in lenses that have not been suggest. You may even for strategic reasons omit mentioning a lens that you intend to produce.
This is why I don't really consider patents as a prediction of future lenses.
---------- Post added 22-09-22 at 14:01 ----------
Just for fun, here's a machine translation of the independent claim. Sadly, thay have not applied for a patent outside Japan, which could indicate a low interest in the idea. It seems that the most important aspect of the patent application is how they move two focussing lens groups. I think this can be used in many different lenses.
[Claim 1]
Sequentially from the object side, comprise an object side lens group, an aperture
diaphragm, and an image side lens group, and, [ an object side lens group ]
Sequentially from the object side, have the 1st lens group of the object side, and
the 2nd lens group of the object side, and, [ an image side lens group ] Sequentially
from the object side, the *** 1 lens group of positive refracting power, and the
image side intermediate lens group, Comprise an image side last lens group and the
variable power from a short focal length end to a long focal length end is faced, The
interval of the 1st lens group of the object side, and the 2nd lens group of the
object side, the interval of *** 1 lens group and the image side intermediate lens
group, And the interval of the image side intermediate lens group and the image side
last lens group changes, and, [ at least one copy of the 2nd lens group of the object
side ] Have the object side focussing-lens group which moves to optical axis
direction at the time of the focus to a short distance from infinite distance, and, [
at least one copy of the image side intermediate lens group ] The variable power
optical system characterized by what it has the image side focussing-lens group which
moves to optical axis direction at the time of the focus to a short distance from
infinite distance, and the object side focussing-lens group and the image side
focussing-lens group move to optical axis direction by each other different locus at
the time of the focus to a short distance from infinite distance.
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Forum: Pentax SLR Lens Discussion
12-05-2021, 05:57 AM
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When I sold my DA40 I included the top of a Fuji film canister :)
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Forum: Pentax SLR Lens Discussion
11-24-2021, 07:51 AM
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I loved the DA15 on K-3 and have just started using the D-FA21. So far it looks good and gives the same feeling. I think I'm going to like this. Neither FA20 nor FA*24 gave the same impression.
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Forum: Pentax SLR Lens Discussion
11-16-2021, 03:21 PM
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Thanks!
I´m a bit pragmatic. I have been happy with the other Limiteds, even with their known weaknesses, so I see no reason to worry about the details before the problems arise. Noone has complained about the technical quality of my pictures, even when I have made and sold some larger prints like 1x1,5m.:)
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Forum: Pentax SLR Lens Discussion
10-21-2021, 02:07 PM
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This is what a well used black FA77 looks like. I think it is great. I will never sell it anyway.
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Forum: Pentax News and Rumors
09-14-2020, 01:30 AM
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Forum: Pentax Full Frame
09-09-2020, 02:29 AM
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Yes, even though the 28-105 is quite good at that focal length the D FA*50 is a completely different beast. Of course you get all the advantages of a larger aperture loike bokeh, lighter view finder, DOF etc, but in general it IS a better lens.
For me, they have different types of use, and complement each other.
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Forum: Pentax News and Rumors
06-17-2020, 01:48 AM
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They put a D-FA 70-210 in my box, so it wasn't completely alone in there.
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Forum: Pentax News and Rumors
02-14-2020, 07:27 AM
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I do the same. The FA20 is OK, with some distortion and FA77 is OK for portraits, but I'm looking forward to a 85mm. My 135mm f/2.8 isn't that great but I doubt if there is a market to make a newer version so I may try the new D-FA70-210 f/4.
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Forum: Pentax News and Rumors
02-13-2020, 04:55 AM
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As a person who only use half a binocular anyway this seems like a good ide :-)
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Forum: Pentax News and Rumors
02-03-2020, 07:48 AM
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Years ago Tamron bought the Zenza Bronica medium format system and made some truly wonderful lenses for the line. I still use them and have no problems buying rebranded Pentax lenses made by Tamron. :-)
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Forum: Pentax News and Rumors
08-07-2019, 01:43 AM
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As one of the first buyers in Norway I got a mug and a thermos...
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Forum: Film SLRs and Compact Film Cameras
09-01-2016, 09:39 AM
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Old Polaroid 110B rebuilt for 4x5 :-)
And, yes, the camera and even the finder works. Some pictures here Razzle | Dag Thrane |
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Forum: Pentax K-1 & K-1 II
06-16-2016, 01:10 PM
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Forum: Pentax K-1 & K-1 II
06-15-2016, 12:01 PM
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Notice the cup and thermos....
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Forum: Film SLRs and Compact Film Cameras
02-25-2016, 03:38 PM
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Waiting for K-1
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Forum: Pentax News and Rumors
03-04-2016, 05:02 AM
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Forum: Troubleshooting and Beginner Help
02-10-2016, 02:29 PM
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No, this is NOT Newton rings. Newton rings are uneven and require contact between two surfaces. The phenomena you see in these pictures show rings distributed form the optical axis being gradially closer together. You get this from two parallel surfaces being spaced apart, often in UV filter, and only when the light is (almost) monochromatic, like in the Aurora. The effect is related to socalled Fabry-Perot filtering. You can see an explanation here
http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/fabry.html
and a picture of the rings here as well as more explanation here:
https://en.wikipedia.org/wiki/Fabry–Pérot_interferometer
PS: Take the UV filter off and try again :-)
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Forum: Pentax News and Rumors
11-09-2015, 03:08 PM
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I had the chance to borrow Kenspos lens this weekend for something totally different. Really nice lens at K-3, sharp, silent, fast focus and nice soft out of focus areas. Here´s one for the Bokeh people @ f/3.5:
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Forum: Pentax News and Rumors
04-06-2015, 06:51 AM
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Forum: Pentax News and Rumors
04-03-2015, 05:42 AM
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I suddenly had a chance to test the lens yesterday (thanks to Kenspro) and made a small web site with a couple of images: Pentax D-FA 15--450mm | Dag Thrane
Somehow the EXIF data disappeared but I´ll look into that and add some more pictures.
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