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07-27-2017, 05:10 PM   #1501
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QuoteOriginally posted by Kunzite Quote
Thanks! I forgot that pentax.com might have their own say in things....


07-27-2017, 07:41 PM   #1502
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QuoteOriginally posted by Kunzite Quote
Except Tamron has no suitable 70-300mm, only the one launched in 2010.
I trust Pentax' version would be comparable to the 28-105.
The 70-300 SP is decent yet not offered in K mount and better than the non-SP variant. But it looks like there is a Pentax made version on the way if the roadmap is to be believed...
07-27-2017, 08:02 PM - 1 Like   #1503
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QuoteOriginally posted by mee Quote
But it looks like there is a Pentax made version on the way if the roadmap is to be believed...
Be nice if its DFA WR.
07-27-2017, 08:08 PM - 1 Like   #1504
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QuoteOriginally posted by surfar Quote
Be nice if its DFA WR.
It is on the road map as DFA. Would be very surprised if it was not DC & WR. It would appear to be the longer companion to the DFA 28-105 which would be a welcome addition to the catalog as there is nothing at all available in that range and price point.

07-27-2017, 08:20 PM   #1505
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QuoteOriginally posted by jatrax Quote
It is on the road map as DFA
Ok, I don't look at the roadmap much.

It would be a good companion for the 24/70 as well.
07-27-2017, 08:40 PM - 1 Like   #1506
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QuoteOriginally posted by surfar Quote
It would be a good companion for the 24/70 as well.
Of course. But I think the 15-30, 24-70, 70-200 are one set. We should see a DFA 18-35, 28-105 and 70-300 'consumer' set eventually. Hopefully all three as good as the DFA 28-105.
07-27-2017, 09:17 PM   #1507
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QuoteOriginally posted by jatrax Quote
Of course. But I think the 15-30, 24-70, 70-200 are one set. We should see a DFA 18-35, 28-105 and 70-300 'consumer' set eventually. Hopefully all three as good as the DFA 28-105.
A good 18-35 would make my life complete that and the new 50 1.4)
07-27-2017, 11:47 PM   #1508
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QuoteOriginally posted by mee Quote
The 70-300 SP is decent yet not offered in K mount and better than the non-SP variant. But it looks like there is a Pentax made version on the way if the roadmap is to be believed...
Correction: it looks like Ricoh Imaging plans to make a lens with a similar focal range.
There's no indication of Ricoh Imaging rebadging that old, underperforming lens.

07-28-2017, 04:23 AM   #1509
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The VC model 70-300 of the Tamron is much better than the old screw drive lens we can still buy for Pentax. They recently introduced a new model (030) but only in Japan because they can't keep up with demand otherwise. So making it for Pentax is probably out of the question until they can supply it world wide under the Tamron brand.
07-28-2017, 06:36 AM   #1510
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Oh, right. I see they announced an updated version this year (I was previously using DPReview's lens database, which doesn't have it). But there's nothing about new optics, only "Improvements in AF speed and responsiveness", "Improved VC functions", "External design renovated" and "Equipped with Fluorine Coating to improve user-friendliness for the lens".
TAMRON | News | External design completely revamped and Fluorine Coating now applied improved AF speed and responsiveness, with VC system achieving image stabilization performance level of 4.0 stops
07-28-2017, 07:59 AM   #1511
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Pentax has enough history with design of lenses like the 70-300 variable aperture lenses that I wouldn't think it would be a big deal to update the optical design of the FA version and apply some HD coatings, maybe some seals and go from there. The hardest part is probably whatever the design implications of in lens motor are. I think every new lens at this point is going to have in lens motor at this point.
07-28-2017, 08:09 AM   #1512
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QuoteOriginally posted by Rondec Quote
Pentax has enough history with design of lenses like the 70-300 variable aperture lenses that I wouldn't think it would be a big deal to update the optical design of the FA version and apply some HD coatings, maybe some seals and go from there. The hardest part is probably whatever the design implications of in lens motor are. I think every new lens at this point is going to have in lens motor at this point.
This is something I always wonder. When Pentax did the DFA 28-105 did they use the FA 28-105 as a starting point and just improve the design using the improved technology now available, or did they start from scratch. Any of us who have done building renovations know sometimes it's easier to just tear down and start over than it is to deal with the compromises of an older building. New manufacturing process means different design constraints.

I would assume improvements in manufacturing processes make things possible now, aspherical elements etc. that back when the older lenses were designed were very difficult.

It would be really interesting to hear what a designer has to say about that.
07-28-2017, 09:01 AM   #1513
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QuoteOriginally posted by normhead Quote
This is something I always wonder. When Pentax did the DFA 28-105 did they use the FA 28-105 as a starting point and just improve the design using the improved technology now available, or did they start from scratch. Any of us who have done building renovations know sometimes it's easier to just tear down and start over than it is to deal with the compromises of an older building. New manufacturing process means different design constraints.

I would assume improvements in manufacturing processes make things possible now, aspherical elements etc. that back when the older lenses were designed were very difficult.

It would be really interesting to hear what a designer has to say about that.
My guess is they don't start from scratch. If you look at a lens like the DA 40 versus the M 40, you can see the roots of the lens design, although clearly there are newer coating, auto focus and better design such that the DA 40 is a significantly better lens for most purposes.

Then too, there seem to have been more advancements in the zoom arena than in primes.
07-28-2017, 09:04 AM   #1514
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QuoteOriginally posted by Rondec Quote
My guess is they don't start from scratch. If you look at a lens like the DA 40 versus the M 40, you can see the roots of the lens design, although clearly there are newer coating, auto focus and better design such that the DA 40 is a significantly better lens for most purposes.

Then too, there seem to have been more advancements in the zoom arena than in primes.
That 28-105 is just a dynamite landscape lens. Tess sometimes takes it to shoot on her K-5. We really have nothing else like it. I doubt that lens was possible even a few years ago or there would be comparable predecessors.

Last edited by normhead; 07-28-2017 at 09:11 AM.
07-28-2017, 10:30 AM   #1515
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Norm, do you like the 28-105 on crop more than the 18-135? Not considering the lack of "wide" on the wide end of the 28-105 on crop, thinking about everything else.

Looking at the very basics, the D-FA 28-105 has four more elements than the FA 28-105. Same number of groups. So maybe they're fairly related... but the FA doesn't score very well in user reviews here, where as the D-FA does quite well. Maybe some similarities but I doubt there's much shared.
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