Focus Stacking 焦點堆疊

 

在拍攝近攝物體的時候,總是會有景深過淺的困擾.....突然想到Cheney的Nikon Zf 有focus stacking 焦點堆疊的功能....於是就來試看看啦

第一張照片是在最前方的焦點.....第二張照片則是合成所有拍攝不同焦點後的照片....可以看到花蕊的部分....是明顯的有在焦點內...還是應該說有在景深內呢......（Cheney 不是專家...所以不太懂...可能說的不對也說不定）

Nikon ZF 可以設定拍攝的張數....最高到300張,然後還需要設定對焦步進寬度,可以設定1到10, 據說：1-3 比較適合細節多且距離很近的物體

5-7 適合一般風景或較大的產品

然後下次的拍攝間隔...如果沒有用閃光燈的話, 就是設為00,如果有用閃光燈要設成閃光燈的回電時間

還有第一張曝光鎖定要開啟...這樣可以確保所有拍攝的照片亮度一樣

Nikon Zf 不是在相機裡面直接幫你合成一張照片給你....所以照片要輸入到電腦中再用軟體合成,根據Google AI 的說法, 支援的軟體有Adobe photoshop, Helicon Focus, Affinity photo, and NX studio....前面的兩者...Cheney都沒有.....所以Cheney 用了NX studio 跟 Affinity photo, 不過 NX studio 好像不支援這個focus stacking 的功能....Cheney 一直找不到....ChatGPT也說NX studio 沒有這個功能...查了一下網路...好像也都是這樣說....所以Cheney 就用Affinity photo 合成了

Cheney 是用 NIkon Zf 跟 Zeiss C SONNAR T* 1.5/50 ZM 跟Nisi 49mm 的近攝鏡拍的, 照片是以50張合成的....不過不知道為什麼....Cheney 覺得景深過淺了....本來是希望整體都可以在景深內....有可能是光圈開太大....f8 而已咧.....關於這個部分,Cheney 就不是很懂了

然後Cheney 也嘗試拍了幾次300張的合成....嗯...結果拍著拍著就發現....啊...硬碟要爆倉了....一次300....3張就900.......這不太妙吧........

Ps. iMac M3 處理50張用affinity photo 速度還不錯....300張就沒試了, 這是以NX studio 輸出成原尺寸的jpg 來弄的......

When shooting close-up subjects, there’s always the problem of extremely shallow depth of field… Then Cheney suddenly remembered that Nikon Zf has a focus stacking feature, so Cheney decided to give it a try.

The first photo is focused on the very front… The second photo is a composite made from multiple shots taken at different focus distances. You can see that the flower’s stamens are clearly in focus… or maybe Cheney should say they fall within the depth of field… (Cheney isn’t an expert, so not entirely sure—what Cheney is saying might not be completely accurate.)

The Nikon Zf allows you to set the number of shots, up to a maximum of 300. You also need to set the focus step width, which ranges from 1 to 10. It’s said that:

• 1–3 is better for subjects with lots of fine details at very close distances
• 5–7 is suitable for general scenes or larger objects

Then there’s the interval between shots. If you’re not using flash, you can set it to 00. If you are using flash, you need to match it to the flash recycle time.

Also, you should enable exposure lock for the first shot. This ensures that all the images have consistent brightness.

The Nikon Zf doesn’t combine the images into a final photo in-camera, so you need to transfer them to a computer and use software to merge them. According to Google AI, supported software includes Adobe Photoshop, Helicon Focus, Affinity Photo, and NX Studio. Cheney doesn’t have the first two, so he tried NX Studio and Affinity Photo. However, NX Studio doesn’t seem to support focus stacking—Cheney couldn’t find the feature, and ChatGPT also said it’s not available. After checking online, it seems that’s correct, so Cheney ended up using Affinity Photo for the stacking.

Cheney used a Nikon Zf with a Zeiss C Sonnar T* 1.5/50 ZM and a NiSi 49mm close-up lens. The final image was stacked from 50 shots. But for some reason, Cheney still feels the depth of field is too shallow… The original goal was to have everything within the depth of field. Maybe the aperture was too wide—though it was only f/8… Cheney isn’t very sure about this part.

Cheney also tried shooting a few sets of 300 images… and then quickly realized… wait, the hard drive is going to explode… 300 shots per set, 3 sets equals 900 images… this doesn’t seem very good…

P.S. On an iMac M3, processing 50 images with Affinity Photo is pretty fast. Didn’t try 300 images though. Also, this was done using full-resolution JPGs exported from NX Studio.