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02-10-2020, 03:20 AM   #226
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QuoteOriginally posted by WorksAsIntended Quote
Mirrorless AF is a totally different topic. Fuji therefore is another story imho. All competitors are pretty new to this game and you can see monthly progress on this tlpic on any brand.
The currently used af-c tracking in dslrs usually bottlenecks at the processing unit. One of the reasons they could improve the same af module with the k1 II update compared to the k1 I, same reason why the D5 tracks better than the D850.
If they are able to produce a Pe tax compact style camera with faster chips than bigger competitors, I am not sure about this.
As long as they did not find a completely new algorithm this statement just seems very unlikely.

I would be ingerested to read a Petax source about this, esp from when it dates back is a very interesting information.
I don't think it is an entirely different topic.
With a modern DSLR, it needs to focus like a SLR when the mirror is down, focus like a mirrorless when the mirror is up, and somehow transition between the two.

In some ways, it is the worst of both worlds in terms of complexity.

-Eric

02-10-2020, 04:05 AM   #227
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QuoteOriginally posted by TwoUptons Quote
I don't think it is an entirely different topic.
With a modern DSLR, it needs to focus like a SLR when the mirror is down, focus like a mirrorless when the mirror is up, and somehow transition between the two.

In some ways, it is the worst of both worlds in terms of complexity.

-Eric
I was generally talking about the focusing when using the viewfinder. I could have specified this more clearly. In lifeview it is different and propably easier to close the gap with one or two good data scientists.

Technically it is a different story between the two modes, unless of course they choose the dual cmos solution, which I do not expect because the camera might be a bit too expensive compared to what Pentax users are used to.
02-25-2020, 03:41 PM   #228
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QuoteOriginally posted by Paul the Sunman Quote
Indeed! I love the 15-30, but I wouldn't have bought it if there had been a FF DFA 20ish. As it is, the 15-30 doesn't get packed as often as I'd like, because of its size, so a compact UW prime would still be on my to-buy list. The lens roadmap doesn't inspire confidence that one is anywhere near ready; it still shows as anywhere between 12 and 25 mm! If that's the most precise they can be, I'm guessing it's no more than a sketch on the back of a pizza box.
Absolutely! Or perhaps, instead of (or in addition to) a prime UWA, a medium aperture 15-30. The 2.8 is just too heavy to lug around, and filters for the beast cost another $300. Pentax already recognized the need for a lighter-weight alternative to the 70-200 2.8 with the f/4 version just released. They need to do the same for 15-30 and release an f4 version!! That would make me break my piggy bank in a flash.
02-25-2020, 04:00 PM   #229
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QuoteOriginally posted by TwoUptons Quote
I don't think it is an entirely different topic.
With a modern DSLR, it needs to focus like a SLR when the mirror is down, focus like a mirrorless when the mirror is up, and somehow transition between the two.

In some ways, it is the worst of both worlds in terms of complexity.

-Eric
But best of two worlds in usability

02-25-2020, 04:11 PM - 1 Like   #230
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QuoteOriginally posted by GregL564 Quote
Absolutely! Or perhaps, instead of (or in addition to) a prime UWA, a medium aperture 15-30. The 2.8 is just too heavy to lug around, and filters for the beast cost another $300. Pentax already recognized the need for a lighter-weight alternative to the 70-200 2.8 with the f/4 version just released. They need to do the same for 15-30 and release an f4 version!! That would make me break my piggy bank in a flash.
Same here. 15-30 f/4 or even f/5.6 with very good sharpness across the frame (yes corners too) is on the top of my list. If it wont happen this year I will probably buy 15-30/2.8.
02-26-2020, 06:38 AM   #231
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I think the lens that best replaces the Pentax 15-30 f2.8 for something still offering high IQ but with less weight and size would be the Sigma 17-35 f2.8-4 EX DG. They seem to run around $250 pretty easily now and then on the bay in good to ex+ condition. I don't own one but considered one and checked online samples and reviews before settling on a different lens for less money.

I don't understand why Ricoh hasn't prioritized such a lens but that's another thread for another time.
02-26-2020, 09:24 AM   #232
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It would be nice to see Pentax version of Tamron 17-35 mm f2.8-4.0 Di OSD but I would still prefer 1-2 mm wider and constant f4 lens.

02-26-2020, 09:34 AM   #233
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QuoteOriginally posted by taktoon Quote
It would be nice to see Pentax version of Tamron 17-35 mm f2.8-4.0 Di OSD but I would still prefer 1-2 mm wider and constant f4 lens.
That's taping into the cheap Tamron, those lenses are significantly below OEM standards. It's like some former Pentaxians who switched to Canon for using the Canon 17-40 f4, sharpness is pretty awful even on a 5DII, no advantage of IQ using a full frame camera.
02-26-2020, 09:57 AM - 1 Like   #234
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QuoteOriginally posted by taktoon Quote
It would be nice to see Pentax version of Tamron 17-35 mm f2.8-4.0 Di OSD but I would still prefer 1-2 mm wider and constant f4 lens.
Just for my information, why many people prefer a constant f/4 instead of f/2.8-4, I never understood?
02-26-2020, 10:33 AM - 1 Like   #235
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QuoteOriginally posted by superdave Quote
Just for my information, why many people prefer a constant f/4 instead of f/2.8-4, I never understood?
You're right, it makes no sense with modern day auto exposure, unless a constant f4 is smaller and lighter again.

Constant f4 lenses were more practical back in the old film days.

No way I'd want my DA 20-40 Limited to be constant f4 as 20mm f2.8 is nice and the lens only weighs 283g which is amazing!
02-26-2020, 12:17 PM   #236
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QuoteOriginally posted by biz-engineer Quote
That's taping into the cheap Tamron, those lenses are significantly below OEM standards. It's like some former Pentaxians who switched to Canon for using the Canon 17-40 f4, sharpness is pretty awful even on a 5DII, no advantage of IQ using a full frame camera.
Tamron is modern and quite good performer and there is no similar lens in Pentax line. OEM standards means? DFA 15-30, 24-70, 70-210 are also Tamron lenses with Pentax tweaks.
02-26-2020, 12:25 PM   #237
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QuoteOriginally posted by taktoon Quote
DFA 15-30, 24-70, 70-210 are also Tamron lenses with Pentax tweaks.
Sure. The Tamron 17-35 is not as good as the Tamron 15-30, from what I remember, maybe I'm wrong.
02-26-2020, 12:30 PM   #238
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QuoteOriginally posted by superdave Quote
Just for my information, why many people prefer a constant f/4 instead of f/2.8-4, I never understood?
I do not prefer darker lensin general but in case of this wide angle zoom I would trade 2.8 aperture on wide end for extra 1-2 mm. Just personal preference for wide angle. Also I would be really happy with 15-30 f5.6 if it could take normal filters and be reasonably small but with very good sharpness across the frame. Probably all this will end with purchasing D-FA 15-30 f2.8 as there are no alternatives for this wide angle zoom for Pentax K-1. It is sharp, bright and covers 15-30 range. I would trade "bright" for size and filter thread if there would be this option available.
02-26-2020, 12:35 PM   #239
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QuoteOriginally posted by biz-engineer Quote
Sure. The Tamron 17-35 is not as good as the Tamron 15-30, from what I remember, maybe I'm wrong.
Yes and the DA 50 1.8 is not as good as FA 50 f1.4 which is not nearly as good as D-FA* 50/1.4 and all of them are currently being offered by the same manufacturer.
02-26-2020, 12:56 PM - 1 Like   #240
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QuoteOriginally posted by taktoon Quote
I do not prefer darker lensin general but in case of this wide angle zoom I would trade 2.8 aperture on wide end for extra 1-2 mm. Just personal preference for wide angle. Also I would be really happy with 15-30 f5.6 if it could take normal filters and be reasonably small but with very good sharpness across the frame. Probably all this will end with purchasing D-FA 15-30 f2.8 as there are no alternatives for this wide angle zoom for Pentax K-1. It is sharp, bright and covers 15-30 range. I would trade "bright" for size and filter thread if there would be this option available.
Totally agree for f/4 vs f/2.8 for price, size and weight reason. Personally, I also don't understand why they put rounded aperture blade on a landscape lens... My question was just what is the point of wishing a lens were constant f/4 when it is f/2.8-4 lens.
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