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我對 Sigma 18-50 F2.8 EX DG MACRO 的看法 [複製連結]

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發表於 2009-5-20 13:42:19 |顯示全部樓層 | 字體大小
大家好,

這是我第一次對鏡頭的發表,有什么不對的地方,請多多包含。全是用英文寫的,因為我英文比較行。

Hi all,

I have own this lens for a year on the K10D and I have nothing but full of praises for it. I find that this lens is underrated since no one really write up its virtue. Well, let me say something about it then.

First of all, the lens is focusing accurately at least 90% on the K10D, and that is already incredible and reliable. It is sharp wide open, in the center on the 50mm. It is sharp corner to corner on the 18mm wide open from what I had taken so far. I can email full res pic for those who pixel peep. I find it a very capable lens and I used it 90% of the time because it is also the most useful range for me. I can do portrait at the 50mm end and have my wide angle shots when I want it. The bokeh as shown on the flower shots, shot deliberately at F2.8 to illustrate it bokeh beauty. Compared to what I have now which is the DA50-135 and DA35 macro, I can truly say it stand on its own class and is not beaten by them. For what it is selling, it is truly a steal. I have been tempted to buy the DA*16-50 for a long time but I never found the compiling reason to say "buy it". I have also consider getting the Tamron just to fool it around but given I have the Tamron 28-75 F2.8 before, I think I will passed as well.

The lens minimum focusing distance is 30cm but I think I have push beyond that many times and thus the macro capability is indeed very useful. Do not be wishful thinking that it will give you lifesize macro but for flower shots, it is very versatile, and combined with its 7 blade aperture, you will have a nice bokeh that won't cost you an arm or leg. I have not found the CA or purple fringing annoying or even to raise an eyebrow to ask, "how can I remove that". It has never hit me as a problem but CA do exist in the picture I shot and it is just as it as, a norm in wide angle lenses and the DA*16-50 has it fill of complaint.

Sitting back in front of the lens, I asked myself, why do I like you so much. Many times, I have the urge to replace it with the DA*16-50 or even the tamron because my first portrait lens was the Tamron 28-75mm 2.8 and it made many nice memories for me too. My experience with Sigma was awful and I had the Sigma 18-125mm that time and whatever comes up from that lens went straight to the recycle bin. And before I even looked at the DA*, I could only afford the Sigma or the Tamron. Finally, I told him you win, cos you got 72mm diameter opening over the Tamron 67mm. It was a silly reason, but that reason still hold trues for me till today...lol.  ;)

Recently, I have upgraded to the K20D and the urge to get the DA*16-50 is growing stronger and stronger. Ok, I thought I should just get the DA* and give them a hard fight. It is also to extinguish the urge for the DA* once and for all but I can tell you that before even the fight begins, the Sigma has already won. Why?

1. The SDM of course, no matter how the DA* perform, once the SDM goes, I'm done for the time being and if I'm out of warranty, I still need to pat up some more money on it. So this guy can be a spoilt brat.

2. The Sigma weigh lighter then the DA*.

3. The CA on the DA* is well documented and cursed. I don't how bad is it but I cross my finger on that one.

4. The chances of getting a bad copy of the DA* has better rate of hitting 4D itself. This is one concern of mine, I can be sitting with the dud for sometime before I realise that I got a dud...lol. Though that happen to the Sigma but at least their warranty is 3 years.

5. Cost is a factor.

6. The DA* is weather seal and that completely beat the Sigma. I don't do adverse weather photography, so it's not essential but good to have.

Image quality and bokeh is my deciding criteria because I shoot alot at 50mm portrait and let's see what this 9 aperture blade can do for me. For now, if I were to have one lens, it will be this Sigma baby. Hope it helps for the next one who wants it. ;)

Thank you

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

I took the 6.30pm trip of the Farris Wheel and you can imagine how much light is left then. The street lights are already on and when I came down, it was already dark. I must say that the anti shake of the K10D plus the low ability of the Sigma helps me achieve this, I did not throw away many pics and was astonished at this combination plus how the photos turns out at the end at F2.8. It was all reasonably sharp and the K10D locked focus quickly too. It was the low light ability of this lens that I admired too.


K20D test shots



我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法


Macro Capability



我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

The DA*is 2mm wider over the Sigma and that is a positive attribute but because it is also wider, it has more barrel distortion on the 16mm. It is a double edge sword and it really depends on how the person is going to use it so that the distortion is not that apparent. For my type of shooting, I find that 1 or 2mm wide is negligible to me because of my own composition preference and if I really need wide, I find that I really have take two pics and stitch them up later although not very idea but doable and have done it on many occasions. But recently, I've been thinking about DA 12-24mm or the Sigma 10-20mm to go ultrawide, poisoned by this guy...lol.

http://www.kenrockwell.com/tech/how-to-use-ultra-wide-lenses.htm


我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

我對 Sigma 18-50 F2.8 EX DG MACRO 的看法

I wrote this up because I really think this lens is really capable but yet underrated. Each lens has it own strength over the competition and I merely want to provide information for people looking at this 16-50mm range that this is also an option. The first generation of this lens is really bad and soft, but this redesigned version is a wild horse run. Experience yourself and you will tell.

No matter what, if we get a dud copy, this will destroy the capability of whatever the lens is designed to do.
Memories are collection of every single passing moment and those moment will never repeat. Either we catch it or we lose it.

攻頂去吧~

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發表於 2009-5-20 14:19:31 |顯示全部樓層 | 字體大小
simdavid大大
小弟我也是用這一隻
當我的單眼相機第一隻""鏡頭蓋""
一句話~ 優~~~

喇滴賽救台灣

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發表於 2009-5-20 14:33:52 |顯示全部樓層 | 字體大小
看到落落長的英文直接放棄閱讀,
就讓圖片來說話,
鏡頭好壞我看不出來,
照片我個人覺得拍的很好!

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發表於 2009-5-20 14:35:43 |顯示全部樓層 | 字體大小
Post by bobblake;575691
simdavid大大
小弟我也是用這一隻
當我的單眼相機第一隻""鏡頭蓋""
一句話~ 優~~~

沒錯,我也是這么認為,所以才想于大家分享這物質所朝的鏡頭。坦白說有一天如果我買了DA*,我也還是會留它在身邊,因為它的能力,我太暸解了,也太好用了。
Memories are collection of every single passing moment and those moment will never repeat. Either we catch it or we lose it.

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發表於 2009-5-20 14:38:46 |顯示全部樓層 | 字體大小
Post by rossipa;575698
看到落落長的英文直接放棄閱讀,
就讓圖片來說話,
鏡頭好壞我看不出來,
照片我個人覺得拍的很好!

謝謝,還在努力當中,加油!
Memories are collection of every single passing moment and those moment will never repeat. Either we catch it or we lose it.

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發表於 2009-5-20 15:34:52 |顯示全部樓層 | 字體大小
那請問那個好心且英文好的大大翻一下吧,我好想知道他說什麼,雖然烙烙長但我發誓我一定會看完中文版的心得PFC-Pentax Fans Club

Sr. la disai

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發表於 2009-5-20 16:22:37 |顯示全部樓層 | 字體大小
原廠的好處就發色的豐富性上會比較好一點,
好比這一組sigma照片感覺還是稍微偏黃一點,
綠色的詮釋上也稍微比不上Pentax的。

但DA*16-50/2.8比較不好的問題是SDM馬達災情不時傳出,
而且光軸偏移和移焦也是常被點名。
(攻擊)(攻擊)(攻擊)

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發表於 2009-5-20 16:43:57 |顯示全部樓層 | 字體大小
Post by benjaminlai;575740
但DA*16-50/2.8比較不好的問題是SDM馬達災情不時傳出,而且光軸偏移和移焦也是常被點名。

沒錯,買了之后也會有點不安心,不知有沒有這些問題。自己本身想入手DA*16-50玩看看,比較比較,就是考慮到這些問題,所以遲遲下不了手。但我還是會買,不到黃河心不死PFC-Pentax Fans Club

希望有DA*16-50配K20D的大大,可以多寫寫心得。
Memories are collection of every single passing moment and those moment will never repeat. Either we catch it or we lose it.

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發表於 2009-5-20 16:47:56 |顯示全部樓層 | 字體大小
Post by s885823;575721
那請問那個好心且英文好的大大翻一下吧,我好想知道他說什麼,雖然烙烙長但我發誓我一定會看完中文版的心得PFC-Pentax Fans Club


不好意思,我中文真的不行,講講幾句還可以,寫文章,還是別丟人顯眼, 真是對不起你了。PFC-Pentax Fans Club
Memories are collection of every single passing moment and those moment will never repeat. Either we catch it or we lose it.

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發表於 2009-5-20 20:45:56 |顯示全部樓層 | 字體大小
辛苦了
可惜我是英文苦手
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