补充一下：有价格了

HD Pentax-DA 645 28-45mm f/4.5 ED AW SR

Published by Digital Camera Info, here is the first picture of HD Pentax-DA 645 28-45mm f/4.5 ED AW SR.

It enjoys in-lens stabilisation ('Shake Reduction') and its image circle is limited to the 'small' sensor of Pentax 645D/Z (it doesn't cover the full 645 image circle).

Update (August 4th): Detailed specifications have been published by B&H Photo Video

Pentax HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens B&H Photo

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)

Update (August 5th): Announced.

http://www.us.ricoh-imaging.com/camera-lenses/HD_PENTAX_DA_645_28-45mm_F4.5_ED_AW_SR

http://www.dpreview.com/articles/3534328259/ricoh-adds-hd-pentax-da645-28-45...at-lens-lineup

USD 4,999.95 / GBP 3,399.99.



Read more at: http://www.pentaxforums.com/forums/16-pentax-news-rumors/269214-hd-pentax-da-645-28-45-mm-f-4-5-ed-al-sdm-aw-sr.html#ixzz39UUm7T7m

本帖最后由 seagullxf 于 2014-8-5 13:06 编辑

这个28-45基本用上宾得最新技术，估计不便宜，看size也轻不了。

35、55、150中35最贵，且比25还差那么一点，这下好了，28端基本代替25，怎么也比25+35便宜，比35定小的那一档光圈用Z的高感顶上，好！

这焦段防抖这重量还有这Money怎么办？

知道我刚入4585宾得真是贴心人呀
本帖由安卓客户端发布

又一颗重量级镜头如期而至：

Pentax HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens

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
Features
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'

好的派资，我会试着调整后感觉一下效果，谢谢！

置顶了！

如果一定要提点意见的话，建议再减曝1/3ev到1/2ev。这样第一更突出了瀑布；第二让水的层次更清晰。当然，也可以用ps手段让流水部分（特别是上部的瀑布）局部减曝再加点对比度。个人愚见。

这张图拍得时候都快天黑了，而且山里空气也不太通透，好在没风慢门可以拍得清楚些。终于能理解为什么那些洋鬼子特别钟情这只老头了，个人觉得这镜的素质还真是不错。我现在基本上也都是挂此头练拍，不拍照也扛着到处跑为的是锻炼自己的负重能力

希望派资和各位好友能看图提提意见 本帖最后由 seagullxf 于 2014-8-4 12:27 编辑

谢谢，我回去试下

能看到，但我现在onedrive都进不去那个页面，更没法复制链接了，你是怎么捣鼓进去的呢？

能看到我上面那张图吗？我就是用那个OneDrive捣鼓出来，但不知能用几天。

实际也是这么用来着，只不过也就2、3台电脑通过千兆以太网共用

想不到DNS污染会出现在网盘应用。。。
搜DNScrypt。。。

微软的onedrive现在一直进不去了 大家知道怎么解决吗

645D，FA45-85mm，ISO100，F16，1.6S

不合规外链图片,不直接显示，谨慎点击

这配置还基本够用？看来得弄个什么“图像服务器”才够折腾

这是必须的，还有。。。
以下内容由 oldPfans 于 2014-8-3 22:48 补充
还有拿捏大幅的

国际鸟人?

就目前使用多年30寸2K屏的感受看，并不存在左右晃动看图的情况，当然要保持60cm以上的观看距离。而且30寸比27寸2k屏更适合图像和文字处理，也是2k和4K的分界线，30寸以内的4K显示器分辨率太高了，文字处理不适合。

至于显卡与CPU主要要求来自于图像处理，现在的配置是志强处理器、32G内存、2G 256bit显卡，240G SSD作系统盘、4个3TB组成RAID作数据盘，基本可以应付PS、LR、ACDsee、PTGUI等软件同时打开并进行多图处理要求。 本帖最后由 oldPfans 于 2014-8-3 18:00 编辑

大屏是好，但是太近了眼珠最好是广角，否则头要像云台一样上下左右摇晃很累另外显卡和CPU的速度也得跟上。

所以要上32寸以上的4k，目前最好的是夏普屏，夏普321要价2.5w以上。

该打倒的是那些隐性土豪

上4K的显示器也不贵，可是要看那些小图就别扭，放大有点马赛克。

这是电视还是显示器呀
我搬家也要换显示其了。

亮骚，打倒土豪！

咱的是30寸HP ZR30W（2560x1600），也有一台三星的32寸（2560x1440），准备上夏普的32寸4K显示器了。大图贴呗，自然上2800x2100，只好左右上下扯动。。。 本帖最后由 oldPfans 于 2014-8-2 23:34 编辑

OldPfans老师傅，你的显示器多大的呀？您放的图看不全哈，我用27“的呀
这是让我换显示器呀 本帖最后由 尼康无限远 于 2014-8-2 23:26 编辑

※※东九林场
645D，FA55-110@55mm，iso400，f11，1/100s，手持

谢谢！是啊，台风前后难得好天气