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01-28-2019, 10:14 AM - 1 Like   #61
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There is an english section of this page. That says

QuoteQuote:
Latest GR Touch & Try
We have prepared a Touch & Try section for the latest model of the GR-series (prototype) currently under development. For the first time in Japan, you can experience the evolved "GR" camera.
Well to me this sounds as if the camera could still be ready for market at the show.

01-28-2019, 11:35 AM   #62
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Not a GRIII place. GRIII is a KP into a smaller than GR II body with the on sensor PDAF of the K70. Nothing high risk IMO, unless there are some other features that are completely new to Ricoh Imaging prior developments. I feel like it's going to be release around CP+, if not it'd better have some darn good new features that none of the previous camera model had.
01-28-2019, 12:17 PM   #63
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QuoteOriginally posted by biz-engineer Quote
Strange. Why would there be both 70-200 f4 and 70-300, too much overlap to my taste.
JAre
Iím expecting the 70-200 f4 to be aimed mostly as a nice portrait zoom that does sports and wildlife while the ~70-300 will be f4.5-5.8 or something and be aimed as more of a travel telephoto...

That keeps them separated in market as well as price. I expect the 70-300 to be significantly less expensive than the 70-200...

But I also donít know any more than the rest of you

-Eric
01-28-2019, 12:29 PM   #64
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I expect the 70-300 to be compact and light like the HD DA 55-300 mm F4.5-6.3 ED PLM WR RE

01-28-2019, 12:49 PM - 1 Like   #65
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QuoteOriginally posted by TwoUptons Quote
I’m expecting the 70-200 f4 to be aimed mostly as a nice portrait zoom that does sports and wildlife
Possibly. For me, 70-200 is too short for wildlife in general , even in safaris where 300mm is good to have. For portraits I use the DFA*70-200 f2.8, superb image rendering and very versatile, from subject pop with smooth background to corner to corner sharp frames.
01-28-2019, 01:35 PM   #66
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QuoteOriginally posted by biz-engineer Quote
Not a GRIII place. GRIII is a KP into a smaller than GR II body with the on sensor PDAF of the K70. Nothing high risk IMO, unless there are some other features that are completely new to Ricoh Imaging prior developments. I feel like it's going to be release around CP+, if not it'd better have some darn good new features that none of the previous camera model had.
The touch screen will be an historical first for RI.
It's impact on UI will definitely be significant imho.
01-28-2019, 10:18 PM   #67
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QuoteOriginally posted by biz-engineer Quote
I've had TC, sold them, buy TC again and sold again. Image comparison of crop vs TC told me that TC is only valuable when the sensor resolution doesn't allow to crop, e.g 24Mpixel instead of 36Mp or 45Mp. AF generally works better without TC, so unless the lens out-resolve the sensor by a good margin TC don't bring anything (get the image on the whole frame and bump iso to compensate for loss of light => no better than cropping of high res. sensor). So, unless Pentax makes a fast 16Mp or 24Mp camera, I'll never get any TC again. TC is great with a 16Mp full frame that boast 10 frames per seconds, OTOH TC on a K1 is a waste.


Disagree there. The Tamron 1.4x TC with Tamron 70-200 f/2.8 is an absolute dream to shoot telephoto with on the K-1. It is as fast focusing that lens with the TC applied than without, and the IQ on the lens with the TC applied is as good as I can make out at 100% with any other high quality lens. It is a joy to finally have this a reality when all my previous cameras had slower AF and obvious focusing difficulty causing a degradation of IQ with this combination.


01-28-2019, 11:58 PM   #68
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QuoteOriginally posted by Ash Quote
Disagree there. The Tamron 1.4x TC with Tamron 70-200 f/2.8 is an absolute dream to shoot telephoto with on the K-1. It is as fast focusing that lens with the TC applied than without, and the IQ on the lens with the TC applied is as good as I can make out at 100% with any other high quality lens. It is a joy to finally have this a reality when all my previous cameras had slower AF and obvious focusing difficulty causing a degradation of IQ with this combination.
I've had that lens, two TCs , compared apsc tc vs full frame crop, on the K1, decided to sell the TCs and use crop mode instead of full frame with TC: crop mode resolution was the same as full frame with TC, except with TC AF points are in the center of the frame only and in crop mode the AF points cover more of the frame. That was my choice based on comparing real images side by side. Maybe with the DFA70-200 f2.8, a proper TC would be ok , because the DFA70-200 has enough sharpness budget and brigthness to still deliver acceptable images with a TC.


The way TC works is to spread the image wider from the lens exit to the sensor: diffraction from lens is enlarged together with optical dispersion and aberrations. That's why in order to benefit from a TC, the lens must out-resolve the sensor, means fast enough to start with no diffraction and no aberration. So usually, a good f2.8 lens will deliver acceptable results with a TC, but f5.6 lenses won't (on top of being problematic for AF). Currently, the only Pentax lenses capable of bringing a benefit with a TC is the DFA*70-200, DA200, DA*300, DFA100 macro, and the DFA*50... but not must interest to stick a TC on a 50mm lens IMO.

01-29-2019, 12:25 AM - 1 Like   #69
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QuoteOriginally posted by biz-engineer Quote
I've had that lens, two TCs , compared apsc tc vs full frame crop, on the K1, decided to sell the TCs and use crop mode instead of full frame with TC: crop mode resolution was the same as full frame with TC, except with TC AF points are in the center of the frame only and in crop mode the AF points cover more of the frame. That was my choice based on comparing real images side by side. Maybe with the DFA70-200 f2.8, a proper TC would be ok , because the DFA70-200 has enough sharpness budget and brigthness to still deliver acceptable images with a TC.


The way TC works is to spread the image wider from the lens exit to the sensor: diffraction from lens is enlarged together with optical dispersion and aberrations. That's why in order to benefit from a TC, the lens must out-resolve the sensor, means fast enough to start with no diffraction and no aberration. So usually, a good f2.8 lens will deliver acceptable results with a TC, but f5.6 lenses won't (on top of being problematic for AF). Currently, the only Pentax lenses capable of bringing a benefit with a TC is the DFA*70-200, DA200, DA*300, DFA100 macro, and the DFA*50... but not must interest to stick a TC on a 50mm lens IMO.


All of that is well appreciated. And I couldnít tell you if the Tamron combination outresolves the 36Mp sensor. But I do know that the results are very sharp at 100% with the TC. I have no intention of using the TC on my Sigma 400/5.6, as intriguing as that may seem (Iím not even joking to think that my 500mm f/8 mirror lens would outresolve it).




01-29-2019, 01:46 AM   #70
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QuoteOriginally posted by TwoUptons Quote
I’m expecting the 70-200 f4 to be aimed mostly as a nice portrait zoom that does sports and wildlife while the ~70-300 will be f4.5-5.8 or something and be aimed as more of a travel telephoto...

That keeps them separated in market as well as price. I expect the 70-300 to be significantly less expensive than the 70-200...

But I also don’t know any more than the rest of you

-Eric
In my opinion the 70-200 f/4 could be a perfect landscape telephoto lens, if its sharp from corner to corner @ f/5.6 or f/8...
70-300mm will most likely be a low cost kit lens that cover FF with crappy IQ in the corners and lot of purple fringing Not sure if a such lens could interrest someone who purchased an expensive FF camera, except for portrait may be.
01-29-2019, 02:40 AM   #71
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QuoteOriginally posted by superdave Quote
In my opinion the 70-200 f/4 could be a perfect landscape telephoto lens, if its sharp from corner to corner @ f/5.6 or f/8...
70-300mm will most likely be a low cost kit lens that cover FF with crappy IQ in the corners and lot of purple fringing Not sure if a such lens could interrest someone who purchased an expensive FF camera, except for portrait may be.
Yeah, and I want one largely for chasing around a six-year-old on the (reduced-size) football pitch... as a smaller, less-expensive alternative to the f2.8...

And if you want a cheap FF 70-300 with lots of purple fringing, Pentax is going to have a time keeping up with the Tamron.
It is really cheap and has HUGE purple fringing
I hate that I like mine as much as I do...

-Eric
01-29-2019, 03:10 AM - 2 Likes   #72
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QuoteOriginally posted by superdave Quote
70-300mm will most likely be a low cost kit lens that cover FF with crappy IQ in the corners and lot of purple fringing
I wouldn't be so dismissive about it. The 28-105 is also excellent and the DA 55-300 PLM is very well controlled: HD Pentax-DA 55-300mm F4.5-6.3 PLM WR RE Review - Aberrations | PentaxForums.com Reviews

Pentax know how to make lenses. The Tamron screw drive 70-300 is a very old design and not representative of what newly developed glass can do. The lens won't be $300 either. More like $500/600 introduction price. (The 55-300 was 450 at introduction).
01-31-2019, 12:55 PM   #73
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QuoteOriginally posted by northcoastgreg Quote
The Nikon 70-200 f4 weighs 30 ounces; the Sony 70-200 f4 weighs 29.6 ounces; the Tokina 70-200 f4 weighs 31.7 ounces. In other words, the typical 70-200 f4 zoom lens comes in at nearly twice the weight of the DFA 28-105 (15.5 ounces). Hardly a lightweight counterpart!
For comparison's sake, a traditional manual focus 70-200/4 with reasonable build quality weighs in at about 24 oz (Pentax-A 70-210/4) to about 30 oz (Tamron SP 70-210/3.5). I own both and while neither is light, both are a heck of a lot easier to work with than the D FA 70-200/2.8 at over 60 oz. The fixed maximum aperture comes at a price weight-wise.


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01-31-2019, 03:09 PM - 2 Likes   #74
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QuoteOriginally posted by superdave Quote
In my opinion the 70-200 f/4 could be a perfect landscape telephoto lens, if its sharp from corner to corner @ f/5.6 or f/8...
But you don't need f4 for landscape. The problem with the f4 zoom is it will likely cost over $1,300. For those of us who don't need the f4, that's a heavy premium to pay just to have a nice zoom in that focal range.

QuoteOriginally posted by superdave Quote
70-300mm will most likely be a low cost kit lens that cover FF with crappy IQ in the corners and lot of purple fringing
This strikes me as nineties thinking. Yes, in the nineties 70-300's, and slow aperture zoom lenses in general, weren't that good. But that was a quarter century ago. Times are different now. There's some pretty good 70-300's on the market, and Pentax has shown no indication that they're going to make crap glass for the K-1. The DFA 28-105, despite its slow aperture, is a darn good lens. Why shouldn't the 70-300 be just as good as well, at more than half the cost and maybe even lighter in weight as well than the 70-200/4? Pentax has already shown, not merely the DFA 28-105, but with the DA 16-85 and the DA 55-300 PLM, that slow variable aperture lenses can be nearly as good as considerably more expensive constant aperture zooms.
01-31-2019, 03:23 PM   #75
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QuoteOriginally posted by Ash Quote
Disagree there. The Tamron 1.4x TC with Tamron 70-200 f/2.8 is an absolute dream to shoot telephoto with on the K-1. It is as fast focusing that lens with the TC applied than without, and the IQ on the lens with the TC applied is as good as I can make out at 100% with any other high quality lens. It is a joy to finally have this a reality when all my previous cameras had slower AF and obvious focusing difficulty causing a degradation of IQ with this combination.
I have the Tamron 1.4x TC and it is very good. But mine is getting cloudy and will need to be replaced. Hopefully with a new Pentax 1.4x TC that will come out THIS YEAR!!!! Money set aside and waiting.
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