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Forum: Pentax News and Rumors 09-14-2020, 04:49 AM  
Patents possibly linked to the APS-C flagship
Posted By DagT
Replies: 108
Views: 11,730
This is explain in the patent I referred to earlier today.
Forum: Pentax News and Rumors 09-14-2020, 01:52 AM  
GR sister coming?
Posted By DagT
Replies: 65
Views: 4,444
Real products is only one reason for applying for a patent. :cool:
Sometimes that may do it to avoid a competing solution, annoying your competitors, other times for trading, getting access to solutions patented by others.
Forum: Pentax News and Rumors 09-14-2020, 01:30 AM  
Patents possibly linked to the APS-C flagship
Posted By DagT
Replies: 108
Views: 11,730
I think this patent is more relevant to the prism, with an explanation of the influence of refractive index etc.
Espacenet - Original document
Forum: Pentax Full Frame 09-09-2020, 02:29 AM  
full frame lenses
Posted By DagT
Replies: 24
Views: 1,989
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.
Forum: Pentax News and Rumors 09-08-2020, 03:07 AM  
Patents possibly linked to the APS-C flagship
Posted By DagT
Replies: 108
Views: 11,730
Thanks. Now corrected.
Forum: Pentax News and Rumors 09-08-2020, 12:53 AM  
Patents possibly linked to the APS-C flagship
Posted By DagT
Replies: 108
Views: 11,730
No. The light entering the prism is not perpendicular to the surface. The light entering from the screen is scattered and a higher refractive index will make more use of the light scattered from the screen as more of it will be refracted sufficiently to be reflected by the internal surfaces in the prism. The ocular lenses are focused on the screen, receiving that light. The higher refractive index also makes the optical path length from the screen to the eye higher en then you need to ajust that part as well.

Think of the differences between the cheap pentaprisms that made small and dark finders, compared with the glass prisms of more expensive models.
Forum: Pentax Full Frame 08-25-2020, 06:37 AM  
full frame lenses
Posted By DagT
Replies: 24
Views: 1,989
Depends on the use.

I use zooms for hiking and walks and thus weight is an issue. So I got 28-105 and 70-210 for that purpose. Both are excellent for their use although I might some miss the little extra like optical quality and aperture, but most likely I wouldn't have the large 2.8 zooms around when I need them.

For other kinds of use, like portraits, where weight and size doesn't matte, I have D-FA*50 and will soon get the D-FA*85 (until then using A*85 and FA77).

I also have the FA Limiteds for everything else, like travel photography and streets.
Forum: Pentax News and Rumors 08-23-2020, 04:42 AM  
Patents possibly linked to the APS-C flagship
Posted By DagT
Replies: 108
Views: 11,730
There is a bit more about the stacked sensor here:
Espacenet ? search results

Probably a dead end as they have not applied for corresponding patents outside Japan.
Forum: Pentax News and Rumors 07-17-2020, 01:44 AM  
What Pentax Values Most in Future Cameras
Posted By DagT
Replies: 363
Views: 24,993
Tamron also made several lenses in the PS series for the SQ-series. They are very good. Especially the PS180mm which is my all tie favorite portrait lens.
Forum: Pentax K-1 06-24-2020, 12:08 PM  
sound of air from 28-105 DFA WR
Posted By DagT
Replies: 5
Views: 749
The reason why you hear the breathing on DFA28-105 is that it is WR. The components in the lens are pretty tight but in order to get rid of the air the camera channels it through the body instead, closer to the ear. The lens does not behave light a vacuume cleaner but the body does. As there is usually less water by the camera and the channels are longer not much water reaches the places where it can du much harm.
Forum: Pentax News and Rumors 06-24-2020, 01:17 AM  
Now available in Europe: O-HC171 (Anniversary Hotshoe Cover)
Posted By DagT
Replies: 131
Views: 7,932
Oh ::lol: OK
Forum: Pentax News and Rumors 06-24-2020, 01:11 AM  
Now available in Europe: O-HC171 (Anniversary Hotshoe Cover)
Posted By DagT
Replies: 131
Views: 7,932
Hmm, it still seems to be available here in Norway.
Forum: Pentax News and Rumors 06-17-2020, 01:48 AM  
Now available in Europe: O-HC171 (Anniversary Hotshoe Cover)
Posted By DagT
Replies: 131
Views: 7,932
They put a D-FA 70-210 in my box, so it wasn't completely alone in there.
Forum: Pentax News and Rumors 06-12-2020, 02:07 AM  
Kenspo moves on
Posted By DagT
Replies: 331
Views: 33,546
Nobody wanted to buy it? :-D

I guess I'll get the D-FA*85 in a few months so if you are really nice you can try it. I agree with you regarding the sensor on K-1. It is still amazing. As you know I'm too slow to care about AF and fps.
Forum: Pentax News and Rumors 02-14-2020, 07:27 AM  
Ricoh's financial results for Q3: improved Smart Vision's earnings
Posted By DagT
Replies: 137
Views: 11,201
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.
Forum: Pentax News and Rumors 02-13-2020, 04:55 AM  
"3 way" binocular and monocular projects
Posted By DagT
Replies: 51
Views: 6,682
As a person who only use half a binocular anyway this seems like a good ide :-)
Forum: Pentax News and Rumors 02-03-2020, 07:48 AM  
HD Pentax-D FA 70-210mm f/4 ED SDM WR
Posted By DagT
Replies: 1,455
Views: 116,630
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. :-)
Forum: Pentax News and Rumors 08-07-2019, 01:43 AM  
Various Pentax and Theta accessories announced by Ricoh Imaging
Posted By DagT
Replies: 41
Views: 4,666
As one of the first buyers in Norway I got a mug and a thermos...
Forum: Pentax Full Frame 03-17-2019, 02:45 AM  
K1 users: what lenses do you use?
Posted By DagT
Replies: 197
Views: 19,576
Wow, thanks Ben!

As for the FA43 and D-FA*50 the FA43 is convenient as a walkaround lens, especially as I mostly use FA31 and FA77 for street type photography.

The D-FA*50 is a beast, but optically great, one of the best lenses I have had, so it is mostly for critical shots. Iīm looking forward to the D-FA*85, as I loved the A*85 when I used film.

Dag
Forum: Pentax Full Frame 03-14-2019, 03:07 PM  
K1 users: what lenses do you use?
Posted By DagT
Replies: 197
Views: 19,576
I just came back from a trip to Venice during the Carnival. Pictures here: Venice 2019 | Dag Thrane

I brought FA24, FA31, FA43, D-FA*50, FA77 and FA135. FA31 and FA77 was the most used lenses and a friend of mind borrowed the FA43 so I didnīt use it.

Iīve also got D-FA28-105 for short walks, and D-FA100 macro and DA*200mm for special purposes, but donīt use them that much.
Forum: Pentax News and Rumors 02-28-2018, 07:48 AM  
Good: New roadmap, new lens
Posted By DagT
Replies: 407
Views: 33,125
Back in the film days I often used 24-50 f/4 and 70-210 f/4 when hiking and general nature photography. It was a great combination covering most of my needs without being too large and heavy. 24-90 f/4 and 70-200 f/4 would be a great combination for my use.
Forum: Pentax News and Rumors 02-28-2018, 03:15 AM  
Good: New roadmap, new lens
Posted By DagT
Replies: 407
Views: 33,125
No need for that. Just give it to me and I can keep it in my cellar (when not in use).
Forum: Pentax News and Rumors 12-18-2017, 05:38 AM  
Next hours or days we get a new firmware for K-1
Posted By DagT
Replies: 190
Views: 25,816
Just keep in mind that this probably also ensure that Pentax has some unique features of their own :-)
Forum: Pentax SLR Lens Discussion 02-14-2017, 05:25 AM  
Pentax 20mm F2.8 A
Posted By DagT
Replies: 6
Views: 1,130
Just in case:
If you compare the field of view with a FA31 mounted on K-1, then yes, the A20 will give you approximately the same if you use it on an APS-C sensor. However, the field of view you get with the A20 on an APS-C sensor will be identical to the field of view you get with a DA18-55 at 20mm on an APS-C sensor, and almost the same field of view that you get with the DA21 lens on that sensor.

:-)
Forum: Pentax SLR Lens Discussion 02-09-2017, 09:26 AM  
Pentax 20mm F2.8 A
Posted By DagT
Replies: 6
Views: 1,130
Iīve tried A20mm on a K-3, K-5 as well as some older cameras (and also K-1). It is a great lens, but with a little distortion. As UncleVanya say the field of view will be the same as when you is you chose 20mm on your 18-55mm lens.
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