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fa28-105mm f4-5.6 IF

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bricksw 主題  | 發表  |   傳送訊息     發表於 2007-5-25 18:51:31
未知各位大大 可有對這鏡頭的評論呢?!?!

另外 小弟是 ist DL 的使用者, 使用全手動方法操作相機.
但發現 相機的感光與 ISO 比例不是很好 (即不是線性, 若有太陽光, 快門可到 1/500, 但若陽光只弱一點, 迅速變回1/90 也可以, 相ISO設定)

未知各位大大可有甚麼設定 指教小弟呢'?!?!?


hates13 主題  | 發表  |   傳送訊息     發表於 2007-5-25 19:03:52
(62mm) SMC PENTAX  FA  28-105mm F/4-5.6 (IF)
傳統底片機不錯的旅遊鏡選擇之一,成像(劣 普 良 優)在[color="Red"]普良之間.在[color="Blue"]stans-photography網站中.用家有以下不同的評價,提供您參考!!

[color="Blue"]Roberto Burgos S. - Today I dropped by the Pentax rep and took a close look at the new FA28/105 f/4-5.6. I also took a camera body and my FA28/70 f4 to do some tests with film.

First impressions: The lens feels very well built. Its plastic bodied as all the consumer grade zooms. It is undoubly a Tamron regbadge. It comes with matching tulip hood and finished in silver. It is an internal focus zoom and the front element does not rotate. The focusing ring is VERY WELL damped for manual focusing. In fact, it is the best damping I've felt from any AF pentax zoom lens. It uses 62 mm filters.

Tests: I mounted the camera on tripod and placed it at the store entrance facing out. there was an aluminum plaque with engraving about 15 meters away, so I chose it as my target for resolution. I shot with the new FA28/108 at two stops from wide open at 28, 70 and 105 mm settings. I also framed the plaque at center and at the lower left corner. Later, I did the same set with the FA28/70 f4 at 28 and 70 mm setting. Just for the critical comparisson, I did the same shots with my FA28/2.8 AS @f/4.

Got the negative developed and then scanned (high resolution equivalent for a 9 x 13 inch print at 300 dpi) a section of the negatives (the plaque) from all the frames. I took close notes of every frame and conditions. Last I placed all the frame segments on a Corel 9 file on a grid for comparisson purposes. Printed the file on my HP 1120C at highest resolution possible on Ilford Photo Inkjet paper.

Results: At 28 mm, the new FA28/105 shows a bit more detail than the FA28/70 f4, and about the same detail as the FA28/2.8 at center. At corners, the new FA28/105 clearly outperforms "my" FA28/70 but none of the zooms is as clear and sharp as the FA28/2.8. At 70 mm the new FA28/105 shows about the same results as in 28 mm, and it shows slightly less light falloff as the FA28/70.

At 105 mm the FA28/105 shows good sharpness and contrast at center, but shows incresed contrast at corners.

Due to shooting testing conditions (heavy overcast day), I could not test for flare, but seems that the new lens has it well controlled. Also, I would have liked to test putting on and off the hood with a polarizer filteron, because with my former FA28/200 the hood would not go in if a polarizer was on.

Conclusions: The new FA28/105 lens shows good performance, very well built, extraordinary damping on the focus ring and optically, it performs as "good" as MY FA28/70 f4. I make special emphasis in MY FA28/70 since this lens was dissassembled for cleaning a weird stain on one of the inner elements, but after cleaning there still shows "something" where the stain was, like the coating was removed or such. . .

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[color="Blue"]Roberto Burgos S. (follow-up report) - I had the older FA28/105 (4 years ago) and now have the new FA28/105 IF. To be honest, I cannot tell the difference between both lenses. I would have to do really big enlargements in order to be able to notice a difference. The good thing about the new 28/105 is that the front element does not rotate, so I have it fitted with polarizer 100% of the time. Also, it comes with a very nice and usefull tulip shaped matched hood. BTW, it uses 62 mm filters, while the old version used 58mm filters.

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[color="Blue"]Roland Mabo - Pentax FA 28-105 f/4-5.6 IF Silver: Decent build quality, optically not as good as the power zoom but the differencies are quite small. Lighter than the power zoom. 62mm filter thread and non-rotating front lens element. [color="Red"]This is actually a Tamron lens, often you can buy the Tamron AF 28-105 f/4-5.6 IF for less than the Pentax branded


artree 主題  | 發表  |   傳送訊息     發表於 2007-5-25 20:06:07
Post by hates13;314470
(62mm) SMC PENTAX FA 28-105mm F/4-5.6 (IF)
傳統底片機不錯的旅遊鏡選擇之一,成像(劣 普 良 優)在普良之間.在stans-photography網站中...




weizong 主題  | 發表  |   傳送訊息     發表於 2007-5-25 20:20:50


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