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Forum: Pentax News and Rumors
05-25-2019, 12:23 PM
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I think what will matter the most in the end, is how quickly that combined OVF type PDAF-CDAF will work, and how will that improve subject tracking performance. Obviously, it's difficult to expect AF point coverage similar to PDAF based MILC, but if it bridged the gap compared to other current DSLRs, that would be great.
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Forum: Pentax News and Rumors
05-22-2019, 01:44 PM
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Something interesting (I think) surfaced today on ipforce.jp (I used google translate):
??6515452 | ???????IP Force?
Camera equipped with contrast AF function
"As described above, according to the present embodiment, in the single-lens reflex digital camera 10 having the photometric sensor 20A and the distance measuring sensor 18A, phase difference focus detection using the distance measuring sensor 18A and contrast using the photometric sensor 20A Formula focus detection can be selectively performed by user setting. Further, even in the case where phase difference type focus detection is set, it is possible to switch to contrast type focus detection when it is difficult to determine the in-focus state by the phase difference type focus detection for the subject characteristic and the subject area.
[0060]
By selectively setting two focus detection methods, it becomes possible to set focus detection methods suitable for various photographing situations. And since contrast type focus detection is performed using photometric sensor 20A provided in connection with exposure control, a problem of parallax does not occur. Furthermore, it is possible for the user to confirm an object image and its area in focus using the optical finder, and to perform contrast AF processing without discomfort while performing the same shooting operation as a conventional single-lens reflex camera. Can. Furthermore, since the photometric sensor 20A for detecting the brightness of the subject is used, it is not necessary to provide a circuit such as a new imaging element."
Basically, if I understand it right, Ricoh has put a small sensor inside the pentaprism housing that can perform contrast detect AF while user is using the OVF, and it can work somewhat alongside the standard PDAF module below the mirror.
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Forum: Pentax News and Rumors
12-21-2018, 11:18 AM
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I guess I only looked at the image 1. Images 19 and 25 indeed show 19 elements.
Still, I have no idea why the patent for this lens got published more than 3 years after its introduction to the market, but I guess I don't know much about the whole process.
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Forum: Pentax News and Rumors
12-21-2018, 08:15 AM
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Interesting that they decided to publish the patent just now, if that's just one of the 'release candidates' for D-FA* 70-200. The optical scheme is indeed similar, but has a few more optical elements than the D-FA (22 vs 19). Who knows, maybe they made a new version :P
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Forum: Pentax News and Rumors
12-21-2018, 03:07 AM
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Is this the place to discuss recent patents?
It seems that RI has recently published one that might be of interest to Pentax folks (although my Japanese is non-existant and I depend on Google traslator):
Google Translate
 Quote: Patent No. 6439365 Zoom lens system
[Registration date] November 30, 2018
[Publication date] December 19, 2018
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a zoom lens system, and in particular to a large aperture telephoto zoom lens system suitable for an imaging device such as a digital camera. Does anyone tech-(and Japanese-)savvy know what this patent is about?
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