Pentax 被ricoh 收藏後，推出的第一次hd鍍膜版的變焦鏡皇，Pentax HD 24-70mm f2.8，全名HD PENTAX-D FA 24-70mmF2.8ED SDM WR。集af，防水，最強高像素解像力於一身。九片光圈葉，最近對焦0.38米，12 組 17 片結構，含4片非球面鏡片，3片ED 超低色散鏡片。內對焦模式，82mm 口徑。重量達787克。當年一出是天價價格，沒想過入手，今天跌到合理，果斷入手為手上的pentax k1 配一支防水的變焦鏡，一心打算用來在雨季街拍，或把雨攝風景使用。
毫無疑問，我個人實在太理想化，實試此鏡入手，在pentax k1 上的對焦，簡直就是渣，十次中不了四次，想快拍af，基本上要收光圈f4-f8才有高一點的命中率。pentax k1一代的對焦好廢啊。
在pentax k1 上生無可戀後，打算使用pentax mzs 裝上卷kodak gold 200來試試這支ricoh hd coating的變焦鏡皇，威力如何。結果，不支援其對焦motor，要當成手動鏡用，慘。
作為一支現代的鏡頭，上菲林玩，反差強大，解像力再強，都好像沒多少意思，整體感覺，怪怪的。
欣賞一下其結構，配上pentax k1 去拍拍風景，其實都算是一種享受，在潮濕多雨的夏天，方便實用。粗用一流。
閒曰來西九試試鏡。
在無限遠的解像力上，沒多少可以質疑，f2.8 都已經十分可用。
香港人失去了西環碼頭後，西九算是最後一個方便跳海的好地方了。
有心用此鏡，來追一下曰落，可惜，當天沒有。
這支鏡頭，pentax 友戲稱為暗龍，即是和騰龍那一支一模一樣，是不是呢?
http://www.tamron.com.hk/a032.html
列位看倌自行判斷吧，騰龍這支真的很便宜，只是沒有pentax pk mount.....會不會此鏡和pentax k1 的af對焦契合度差，就因為，它是暗龍鏡呢???
70mm 焦段pan鏡拍拍船。
70mm 焦段下的天陰會展。
ricoh 官網上，對此鏡一番吹奏，看著真的很強，但一對比騰龍網，心又涼了一截，真的hd coating很強大??
「 Exceptional imaging power
- Consisting of 17 elements in 12 groups, the newly designed optics feature three ED (Extra-low Dispersion) optical elements, one anomalous-dispersion-glass aspherical optical element and three aspherical optical elements to accommodate super-high-resolution image sensors. By assuring sufficient light levels even at the edges of the image field and compensating various aberrations to a minimum, it provides a high MTF (Modulation Transfer Function) and delivers well-illustrated, fine-detailed images that are rich in contrast and resolution across the entire image field. When mounted on a current PENTAX K-series camera body, it uses only the central area of the image circle so that it delivers high-resolution images with uniform image description over the entire image field.
- Large-aperture standard zoom lens
- When mounted on a 35mm-format full-frame digital SLR camera body, this zoom lens offers a zoom ratio of approximately 2.9 times to cover the ultra-wide-angle to standard ranges (24mm to 70mm in focal length). It provides a maximum aperture of F2.8 over the entire zoom range to deliver brilliant images. It not only covers the focal-length range most frequently used for ordinary subjects, but also provides ultra-wide-angle coverage to produce distinctive visual expressions, such as exaggerated perspectives or extra-wide depths of field, making it very useful with subjects such as sweeping landscapes and shallow indoor scenes. When mounted on a current K-series digital SLR camera body, it provides focal lengths from 37mm to 107mm in the 35mm format to cover wide-angle to medium-telephoto ranges. Since its large maximum aperture not only creates an excellent bokeh (defocus) effect on the background for beautiful portraits, but also allows the photographer to handhold the camera for poorly illuminated subjects, such as sunsets and indoor scenes.
- Built-in SDM (Supersonic Direct-drive Motor)
- Thanks to the incorporation of a new-generation SDM (Supersonic Direct-drive Motor), this zoom lens assures quiet, high-speed autofocus operation, allowing the photographer to react swiftly to all types of subjects.
- Weather-resistant construction
- This lens features a dependable weather-resistant construction with special seals to effectively prevent the intrusion of water into the lens interior. By pairing it with a weather-resistant PENTAX digital SLR camera body, it assures a durable, dependable digital imaging system that performs superbly in demanding shooting settings ? even in rain or mist, or in locations prone to water splashing or spray.」
「
- HD Coating to improve image description
- The lens is treated with high-grade, multi-layer HD Coating.* Compared with conventional multi-layer coatings, this PENTAX-original coating assures higher light transmittance and less reflection to deliver bright, high-contrast images free of flare and ghost images, even under demanding lighting conditions such as backlight. *2：HD stands for High Definition.
- Quick-Shift Focus system
- The lens comes equipped with the PENTAX-developed Quick-Shift Focus system, which allows the user to instantly switch to manual-focus operation after the subject is captured in focus by the camera’s AF system.
- Other features
- ・Rounded diaphragm to produce a smooth, beautiful bokeh (defocus) effect, while minimizing the streaking effect of point light sources.
・Zoom lock lever to prevent the accidental extension of the lens barrel when pointed downwards.」
回歸apsc 單反的pentax，新出的catalog都很吸引人，支支都ff鏡，但，機身是apsc.....
http://www.ricoh-imaging.co.jp/english/support/pdf/pentax_acc.pdf
在apsc的世界，當今世界，又有誰還是富士的對手?? pentax 還要回歸對焦不可靠的單反系統，用意何在? 想不通。
不過這支hd 24-70 f2.8 全開時，焦內成像和焦外散景感覺都算舒服，沒有nikon 24-70 來得乾。
pentax pk mount 鏡頭真的很罕有，買zeiss pk mount鏡，同一支都特别貴。
2021年的今天，還留著pentax，還玩pentax，只能說，我有愛，你們不明白。
把玩pentax 相機鏡頭變成一種非理性的愛，ricoh 絶對能記一功。pentax k1 出場大成功後，又一記把pentax 推落深淵。
現代鏡實在不應在菲林上玩大反差的場景，上圖作為失敗示範，一流。
散景方面，作為f2.8變焦鏡，沒多少投訴空間。
沒光時，咦，有幾份騰龍味，拍人拍得像去了東南亞。
24mm 之景。
為了沖菲林，用來燒菲林的燒鵝，相信很多人都燒過。
看來，此鏡，用手動，中焦機率比用af還要高。
可悲的是，此鏡的對焦窗實在太廢，沒有更精準的合焦提示，沒法盲拍，很可惜。
如果不是今天跌到4000，真的不會入手，82mm 口徑，玩filter cpl nd都煩。
影玩了一下pentax k1 ，有機會，出出圖。
