回歸攝影 (1) CFV-50C review

M3fans

Jason兄 成50mp, 請問對焦/手持有無特別困難地方呢?

Jason

4


larger file

Jason

M3fans 發表於 2014-11-8 11:03
Jason兄 成50mp, 請問對焦/手持有無特別困難地方呢?

正如vincent兄所講，是用f/8 to f/10 影的。燈也十分簡單，只是一softbox和hair light。

不過，儘管是 f/8，對焦絕不容易！

正如所有3000萬像素以上的相機 (包括 D800E 和 A7R)，傳統的做法：用中心點，例如裂像，先對焦，再構圖，是絕對不可行的。因為 recompose的過程必定會造成 out of focus。

用CFV-50c 最大的問題是：在暗的環境，如studio，使用對焦片旁邊的磨砂對焦，實在是估下估下（起碼我係），並不能確保做到 critical focus。當使用像素高的相機，如數碼背時，就算收細光圈，境深也不足以彌補 out of focus 的問題。

另一方面，Hasselblad V系並不是一部很好『揸手』的相機。非常容易 out of focus。我係outdoor 用 110/2 全開，幾乎全軍盡墨 (當然，我當天剛剛拿機，實在未能掌握。)

Jason

當使用高像素的相機，除非影有一定距離的景物，景深並不有效。

如#4，critical focus 是在model 的右眼後方上，可見右眼的眼睫毛是很清晰細緻的，但左眼的眼睫毛已經不太清晰。其實這張相已加了unsharp mask 和resize to 4000px ("larger file")。可見對焦準確的必要。

Lips

Deleted!!

Jason

5.


larger file

Jason

kgv 發表於 2014-11-8 09:36
Jason 兄
有無 街外 天然景 的作品呀？

k-san, 沒有街景的相。post 張 outdoor 給你參考。110／2 全開。

6.


larger file

Jason

kgv: Does it mean that if I'd like to shoot outdoor handheld, better use those cheap cheap old "backs" with lower pixels counts ... ?

This is a difficult question to answer. The real advantage of CFV-50C is high ISO ability. Almost all DBs cannot give good result above ISO400. For "cheap cheap backs," i.e. older backs, many of them have base ISO at 50, meaning one should not go above ISO100.

I don't think ISO 100 is enough for operating Hasselblad V cameras handheld. Camera-shake (mirror and shutter vibration) is evident on Hasselblad V bodies. One would prefer having high ISO capacity in order to use faster shutter speed.

To me, the real deciding factor or CFV-50C or not is: CCD look vs CMOS look.

Jason

7.


larger file

Jason

as we can see from #6 and #7. both pictures are slightly out of focus. it is quite difficult, as least to me, to shoot at large aperture and handheld.

vincecharus

Jason 發表於 2014-11-9 00:37
as we can see from #6 and #7. both pictures are slightly out of focus. it is quite difficult, as lea ...

The critical question is one that is aesthetic.

The aesthetics of a skin pore perfect digital image is not the same as the aesthetics of a light transition perfect film image.

It is readily apparent to the viewer that the aesthetics are different.  When one looks at a well-executed digital image, the wow factor is in the details, the skin pores, the facial hairs, the mascara on the eyelashes.  When one looks at a well executed film image, the wow factor is in the ease of the light transition, the magic of the flow between light and darkness, how highlight blends into the white, the infinite tones in the shadows, how colors flow and fade into each other.

The essence is the fundamental difference between digital and analogue art.  Any layman will readily appreciate the visual impact, but the professionals (and the connoisseurs) delve into the mechancis behind the differences.

M3fans

just looked at the data sheet, guess Hasselblad need to solve a problem or two before thay can make this back popular
technology exists but people are a bit lazy
if this was to be produced by Sony, things could be different

wolfmkc

點解我睇唔到D相O既???

wolfmkc

wolfmkc 發表於 2014-11-27 15:28
點解我睇唔到D相O既???

Oh, I seeee.....

十四毛

咁好既相做乜delete佢呀

M3fans

saw CFV 50C at Osaka Yodobashi at 1,077,840 yen. With 8% tax refund and current exhcange rate, less than HK$70,000