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07-30-2014, 06:53 AM   #16
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In consideration, the Hassy and Phase One backs that are using this same sensor are priced in the 30k range. Pentax doesn't make sensors, so you will need them to find a source for a full 645 sensor.

07-30-2014, 06:54 AM   #17
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QuoteOriginally posted by Digitalis Quote
I noticed the lens looked odd - but I didn't fully realize why. Perhaps the use of the optical IS system didn't leave enough room for the focusing motor so they moved it and placed the focusing ring accordingly.



A continuous f/2.8 zoom lens in this focal range covering this format would be the size of a melon.
You say it like there's something wrong with that... just kidding,
07-30-2014, 08:53 AM   #18
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QuoteOriginally posted by Pål Jensen Quote
There is a question whether or not there is a point of going larger sensorwise. Ten years from now there are probably 100mp sensor in this size. The cost and hassle of getting larger may not be worth it according to the law of diminishing returns.....
The drawback I see is that some of the older lenses may loose some of their appeal with the crop factor. I might have to replace my 33-55 with the new 28-45 in order to go wide enough if I buy a 645z....
Yes, but taking into consideration the average (very)slow gamme of Pentax 645-lenses , keeping cropped sensor will never "dig the hole" compared with ultra-fast 35mm lenses...
Short-legged strategy that ignores the fact that buyer's money is not any more an issue in Pro-MF market..

QuoteOriginally posted by JinDesu Quote
In consideration, the Hassy and Phase One backs that are using this same sensor are priced in the 30k range. Pentax doesn't make sensors, so you will need them to find a source for a full 645 sensor.
Pentax buys all it's sensors, so this would only imply a new tender.

Last edited by Zygonyx; 07-30-2014 at 08:58 AM.
07-30-2014, 09:31 AM   #19
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QuoteOriginally posted by Zygonyx Quote
Yes, but taking into consideration the average (very)slow gamme of Pentax 645-lenses , keeping cropped sensor will never "dig the hole" compared with ultra-fast 35mm lenses...
Short-legged strategy that ignores the fact that buyer's money is not any more an issue in Pro-MF market..


Pentax buys all it's sensors, so this would only imply a new tender.
Well, I don't want Pentax to buy the ISO50-80 only sensors, a lot of MF seems to live by, for the 645. Why make a field optimized package with a studio only
sensor?

07-30-2014, 11:52 AM   #20
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QuoteOriginally posted by VisualDarkness Quote
Well, I don't want Pentax to buy the ISO50-80 only sensors, a lot of MF seems to live by, for the 645. Why make a field optimized package with a studio only
sensor?
Why not both?
1/ cropped high ISO body
2/ uncropped lower ISO body

Take your pic(k) !
07-30-2014, 12:12 PM   #21
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QuoteOriginally posted by thibs Quote
Why not both?
1/ cropped high ISO body
2/ uncropped lower ISO body

Take your pic(k) !
Cash, quid, monage, bucks and prioritizing production.
07-30-2014, 12:55 PM   #22
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Ricoh shouln't wait for Sony and Canon to swallow one of its last cash-cows....


The 645 DSLR line could actually be on a more steady development trend with a bit more ambition and not much heavier investments... at least keep an eye on the the future + longlasting film users in developping D-FA lenses !
07-30-2014, 10:03 PM   #23
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Zygonyx, the HD Pentax-D FA 645 80-160mm f/4.5 ED AW SR (a.k.a. Tele Zoom on the roadmap) is for you .

HD Pentax-DA 645 28-45mm f/4.5 ED AL SDM AW SR is the 'small sensor' (and up-to-date) version of SMC Pentax-FA 645 33-55mm f/4.5 AL.


Last edited by Mistral75; 07-31-2014 at 03:10 AM. Reason: Correction of typo
07-31-2014, 12:16 AM   #24
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I guess Sony could develop a true 6x4,5 sensor if there is a big push toward it from Pentax AND Hasselblad AND Phase One. But if and when there will be a true 645D, the 33-55 for that sensor it does exist, maybe it needs revamping with HD coatings but still is a exixting lens. On the other hand, for the current 645D, original and Z, a wide-angle zoom with large field of view is needed, and making it DA means less optical acrobatics and reduced costs. I don't see it as a forever commitment to the 44x33 dimension.
07-31-2014, 02:32 AM   #25
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It is not (yet).
07-31-2014, 04:23 AM   #26
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QuoteOriginally posted by eurostar Quote
I guess Sony could develop a true 6x4,5 sensor if there is a big push toward it from Pentax AND Hasselblad AND Phase One. But if and when there will be a true 645D, the 33-55 for that sensor it does exist, maybe it needs revamping with HD coatings but still is a exixting lens. On the other hand, for the current 645D, original and Z, a wide-angle zoom with large field of view is needed, and making it DA means less optical acrobatics and reduced costs. I don't see it as a forever commitment to the 44x33 dimension.
I'm absolutely certain that this lens will not be regarded as adequate for a full frame 645 sensor.
08-04-2014, 02:08 AM   #27
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Original post updated with detailed specifications found at B&H Photo Video.

QuoteOriginally posted by Mistral75 Quote

Overview

The HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens from Pentax provides users of the 645D or 645Z with a weather-resistant, ultra wide-angle zoom lens with a 35mm equivalent focal length of 22-35.5mm. This lens features the 645AF2 mount for electronic aperture control and autofocus with an internal DC motor. Also, it has a constant maximum aperture of f/4.5 throughout its zoom range and uses extra-low dispersion glass elements to limit the effects of chromatic aberrations and improve sharpness.

The dustproof and weather-resistant 28-45mm lens features a quick-shift focus system that allows users to quickly switch from auto to manual focus as well as shake reduction image stabilization good for up to approximately 3.5 stops. Further improving image quality is the use of HD and Aero Bright coatings that reduce flare and ghosting. A Super Protect coating on the front element is also utilized to ensure the surface is free of dust and marks.

This lens has nine rounded aperture blades that will provide smooth out-of-focus areas. Additionally, the lens has an 82mm front filter thread and comes with both a case and hood.
  • Aperture range from f/4.5 to f/32
  • Pentax 645AF2 mount for full electronic aperture control and autofocus with an internal DC motor
  • Lens construction features 17 elements in 12 groups
  • Maximum magnification of 0.21x
  • All-weather design is both dustproof and water-resistant
  • Built-in shake reduction technology provides about 3.5 stops of image stabilization
  • Nine rounded diaphragm blades provide a circular aperture from f/4.5-6.3 at 28mm and from f/4.5-8 at 45mm
  • Minimum focusing distance of 1.3'
Product Highlights
  • Pentax 645AF2 Mount
  • 22-35.5mm (35mm Equivalent)
  • Aperture Range: f/4.5 to f/32
  • Extra-Low Dispersion Elements
  • DC AF Motor & Quick-Shift Focus System
  • Shake Reduction, Image Stabilization
  • Super Protect, HD & Aero Bright Coatings
  • Dustproof and Weather-Resistant
  • Nine Blade Circular Diaphragm
  • Filter Thread: 82mm
Specifications
  • Focal Length 28 - 45 mm
  • Aperture Maximum: f/4.5
  • Minimum: f/32
  • Camera Mount Pentax 645
  • Angle of View @ Infinity 89° - 63°
  • Minimum Focus Distance 1.31' (0.4 m)
  • Diaphragm Blades 9
  • Elements/Groups 17/12
  • Magnification 0.21x
  • DOF Scale No
  • Distance Scale Yes
  • Autofocus Yes
  • Tripod Collar No
  • Movements None
  • Filter Thread Front: 82 mm
  • Weight 3.24 lb (1.47 kg)
  • Dimensions Approx. 3.90 x 5.96" (99 x 151.5 mm)
No price yet.
08-04-2014, 05:10 AM   #28
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QuoteOriginally posted by VisualDarkness Quote
Fits the whole "hand-holdable digital medium-format" thingy perfectly.
Does it? At almost 1.5kg this lens plus the 645Z is hardly handholdable at 3kg. At these weights the 645 systems is no longer a field system but a studio tool. It weights almost three times as much as the 33-55.......
08-04-2014, 05:21 AM   #29
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QuoteOriginally posted by Pål Jensen Quote
Does it? At almost 1.5kg this lens plus the 645Z is hardly handholdable at 3kg. At these weights the 645 systems is no longer a field system but a studio tool. It weights almost three times as much as the 33-55.......
Well, if you compare it the other cameras in the digital mf scene it's one of very few that are possible to handhold. I've ran around hand holding K-5 + Grip + TC + Sigma 150-500mm without any real problem, and I'm a fairly small guy.
08-04-2014, 05:36 AM   #30
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QuoteOriginally posted by VisualDarkness Quote
Well, if you compare it the other cameras in the digital mf scene it's one of very few that are possible to handhold. I've ran around hand holding K-5 + Grip + TC + Sigma 150-500mm without any real problem, and I'm a fairly small guy.
Pentax haven't solved the "wide angle issue" with this lens. When you release a cropped sensored camera you create problems at the wide end because your old lenses doesn't go wide enough. Pentax solution(?) is ultra heavy and probably ultra expensive. I would rather pay $6000 extra to get a FF (645) sensor and not having to buy heavy lenses. The FF 645 wide lenses weights less than 500g.
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