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08-11-2017, 11:26 AM   #31
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a Full-Frame System MILC - to boost Pentax market share...

QuoteOriginally posted by Rondec Quote
I wouldn't say never-- surely Ricoh/Pentax folks are thinking and discussing options for the future right now and are trying to figure out if they can make a go of it as a company that basically only sells SLRs. If Pentax keeps the K mount, then they limit themselves with regard to how small they can make the camera body & lenses. At the same time, if they release a brand new mount, I can't imagine how long it would take them to get lenses for it completed...
With 2-3 Basic Lenses + the 4 Adapters I listed in my 1st post...
... then it would be a far more " Completed " System than the K-01 at launch !!

QuoteOriginally posted by Rondec Quote
... As for the auto focus, there is no particular reason to believe that Pentax would make auto focus on a K-02 better than they have been able to make auto focus on the K-1...
There is 1 New Particular Reason to believe that Pentax will succeed in a Stunning AutoFocus :
- Sony Now manufactures its FF Sensors with embedded CD-AF & Hybrid-AF
It's just at what price Pentax and Sony will conclude the deal !

QuoteOriginally posted by Rondec Quote
Regardless, I just hope they continue trying to innovate and release new products.
+10



08-11-2017, 03:15 PM   #32
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Still, i like the idea of a hybrid DSLR(operating with excellent speed, AF in LV and absolutely silent - Global Electronic Shutter) much much more than I like the idea of having another MILC on the market.
The Nikon D850 will show what can be done(even without a hybrid Viewfinder)
But i sincerly hope the second Full-Frame DSLR from Pentax will rather incorporate 24MP(A9 Sensor) then around 40....
08-12-2017, 03:51 AM   #33
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a Full-Frame System MILC - to boost Pentax market share

QuoteOriginally posted by Aristophanes Quote
Adapters don't work !
Misinformation ?... Lack of information ?...

Confusion between Adapters With or Without Lens(es) inside ?

I use Adapters for Pentax K(45.46), NiKon F(46.5), Canon Eos(44mm)... to Sony E Mount (18mm)
=> I confirm -1) there are Absolutely NO LENSES inside these 3 Adapters !
-2) A Good Sharp Lens remains a Good Sharp Lens.

QuoteOriginally posted by geo444 Quote
...
This MILC has to be built around a Short backfocus Electronic Mount
... let's call it PEM = Pentax Electronic Mount :
- the 1st Adapter to be the PEM to KAF4 = 100% Electronic Adapter !
- the 2nd Adapter to be the PEM to EOS = 100% Electronic Adapter !
- the 3rd Adapter to be the PEM to KAF3 with Aperture control lever ?
- the 4th Adapter to be the PEM to NiKon-F w/ Aperture control lever ?
...
Pentax only have to choose a Register Distance shorter than say ~41 mm for K+F+Eos Compatibility
= Compatibility with Several Hundreds of Good Sharp Lenses from Pentax+NiKon+Canon

The Compatibility with Sony E Lens is Another Deal to Conclude with Sony
- inside the Deal for the FF Sensor with embedded AutoFocus...
If positive, requires a Register Distance of ~15mm
( it's not a problem, NX-mini=7.5mm )
If Direct Compatibility with Sony E Lenses (highly unlikely) Register Distance =18mm !

QuoteOriginally posted by Aristophanes Quote
Almost every serious review and DxO measure conclude that Native Lenses deliver optimal Optical Perfs...
... Camera Bodies are Designed by Each Manufacturer to meet their Lens Mount Specifics...
Are you serious ? Despite Pentax stopped its SDP-UF Refractors... K Astrams keep shooting !
... And you know what ?... You Always Need an Adapter for AstroPhotography !
Do you insinuate AstroPhotographer = ~sunday handyman~ ?

Except Misalignment, or Light Leaks, the Camera Body is of Zero influence on Optical Perfs !

During Exposure Time... Nothing is in the Light Path... from the Lens to the Sensor

Knowing this FF Sensor will be " Made by Sony "...
... does this mean your " Native Lenses " will be Sony E Lenses ?


Last edited by geo444; 08-12-2017 at 04:40 AM.
08-12-2017, 04:17 PM   #34
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QuoteOriginally posted by geo444 Quote
Misinformation ?... Lack of information ?...

Confusion between Adapters With or Without Lens(es) inside ?

I use Adapters for Pentax K(45.46), NiKon F(46.5), Canon Eos(44mm)... to Sony E Mount (18mm)
=> I confirm -1) there are Absolutely NO LENSES inside these 3 Adapters !
-2) A Good Sharp Lens remains a Good Sharp Lens.



Pentax only have to choose a Register Distance shorter than say ~41 mm for K+F+Eos Compatibility
= Compatibility with Several Hundreds of Good Sharp Lenses from Pentax+NiKon+Canon

The Compatibility with Sony E Lens is Another Deal to Conclude with Sony
- inside the Deal for the FF Sensor with embedded AutoFocus...
If positive, requires a Register Distance of ~15mm
( it's not a problem, NX-mini=7.5mm )
If Direct Compatibility with Sony E Lenses (highly unlikely) Register Distance =18mm !



Are you serious ? Despite Pentax stopped its SDP-UF Refractors... K Astrams keep shooting !
... And you know what ?... You Always Need an Adapter for AstroPhotography !
Do you insinuate AstroPhotographer = ~sunday handyman~ ?

Except Misalignment, or Light Leaks, the Camera Body is of Zero influence on Optical Perfs !

During Exposure Time... Nothing is in the Light Path... from the Lens to the Sensor

Knowing this FF Sensor will be " Made by Sony "...
... does this mean your " Native Lenses " will be Sony E Lenses ?

Astrophotography doesn't require wide open lenses and precise DOF control, making adapters a moot point for IQ.

By definition an adapter is a mis-alignment by offsetting the rear element from the capture plane in a manner not originally designed for in the OEM lens design. We knew this back in the film days. That is why bands mount distances were only needing to be off by ~1mm to make crossover difficult. And the sensor plane (especially enlarger sensors) has even less tolerance than the film plane.

Adapters....don't....work. They are an experiment in optics with he most fungible standards of tolerance, not a final product with the highest standards of tolerance. Look at the Leica R to M adapters and all their exceptions.

08-12-2017, 04:58 PM   #35
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Assuming the throat diameter is adequate to the task, the issues of parallelism of mating surfaces and concentricity of optical axes are the ones to be dealt with in designing and manufacturing an adapter that doesn't introduce excessive image distortion. I'm sure that lens designers who are capable of making optical flats are well aware of the engineering techniques needed to minimise such distortion. All that boils down to the body and lens-makers' engineering tolerances, which already exist and introduce errors of some magnitude, even with lenses that don't require an adapter. Adding another pair of mating surfaces adds another level of complexity, unless you make an adapter that is custom-made to a particular body and lens. Non-OEM designers probably have to guess the body and lens tolerances, and try to work in between them, but a good start is to minimise deviations from parallel surfaces and optical axis squareness.

Tight tolerances in the OEM design and manufacturing process are the key to getting the best result, which implies that sticking to one manufacturer for the lot (body, adapter and lens) should give the best result possible, in the best of all possible worlds. It all comes down to how much deviation is acceptable in the final image, though.
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