Went for a stroll at National Taiwan University and tested the NONS SL42 II + Carl Zeiss Planar 50mm f1.4 combo. Noticed significant vignetting at the image periphery, similar to what I observed in the previous test with the Carl Zeiss Distagon 35mm f1.4. I speculate that this vignetting is caused by the 1.8X (NFE) lens attachment on the NONS SL42 II (the diameter of the 50mm f1.4 rear lens element is larger than that of the 1.8X lens). Based on my experience, using the Asahi Optical SMC Pentax 35mm f3.5 minimizes vignetting because the diameter of the rear lens element in the 35mm f3.5 is smaller than that of the 1.8X lens.
台灣大學散步，順便進行 NONS SL42 II + Carl Zeiss Planar 50mm f1.4 測試，成像週邊有很明顯的暗角，這跟之前測試過的 Carl Zeiss Distagon 35mm f1.4 差不多。我研判這暗角應該是 NONS SL42 II上裝的1.8X (NFE)鏡造成的 (50mm f1.4後鏡組鏡片的直徑>1.8X鏡的直徑)，依使用經驗，如果是使用 Asahi Optical SMC Pentax 35mm f3.5 則暗角不明顯，(35mm f3.5後鏡組鏡片的直徑<1.8X鏡的直徑)。
Furthermore, this camera features a leaf (circular) shutter, but due to its slower opening and closing speed, photos taken at shutter speeds of 1/125-1/250 seconds show overexposure by 0.5-1 stop at the center. To avoid this phenomenon, it is recommended to primarily use shutter speeds below 1/60 second (if necessary, ND filters can be used, as the ISO 800 of Instax film is highly sensitive in daylight).
另外，這個相機採用的是葉片(圓形)快門，但是因為快門開闔的速度還不夠快，導致在1/125-1/250秒快門時所拍攝的相片其中心點的曝光會多0.5-1格，為避免這個現象破壞作品，建議以使用1/60秒以下快門為主 (必要時可搭配ND濾鏡使用，因為ISO800的Instax 拍立得相紙，在白天是外的感光度實在太高了)。
The light sensitivity and latitude of Instax Mini film are significantly lower compared to the iPhone camera. In the comparison, the shadows in the Instax photo are almost entirely black, and the lightly blue sky is overexposed, resulting in a whiteout. Instax film is truly only suitable for shooting subjects with relatively even lighting.
Instax mini 拍立得相紙的感光寬容度和 iPhone 手機的相機比起來，真的差很多，可以看到前者的樹蔭近乎全黑，且淡淡藍天已經過度曝光泛白，Instax 拍立得相紙真得只適合用來拍光源較為平均的主題?
Lastly, here is a photo taken with the test combo NONS SL42 II + NFE + Carl Zeiss Planar 50mm f1.4.
最後，來一張本次的測試組合 NONS SL42 II + NFE + Carl Zeiss Planar 50mm f1.4。
NONS SL42 Introduction 相機介紹
https://nonscamera.com/zh-tw/products/nons-sl42-black
Passive EF mount (no electronic signal output, cannot autofocus or control aperture electronically)
Shutter speeds (10 steps): 1/250, 1/125, 1/60, 1/30, 1/15, 1/8, 1/4, 1/2, 1 second, and B shutter
Recommended aperture based on current shutter speed, displaying F-values
B shutter timer can go up to 999 seconds
Film counter, battery status display
Standard hot shoe, syncs with shutter at 1/250
Power: 3200mAh built-in lithium battery, Charging: DC 5V, 1A
Film: Fujifilm Instax Mini
Film size: 54 x 86 mm (width x height)
Image size: 46 x 62 mm (width x height)
Dimensions: 158 x 65 x 116 mm (length x width x height)
Weight: 510 g
被動EF卡口 (無電控信號輸出，無法自動對焦或者電控光圈)
快門速度 (10 檔): 1/250, 1/125, 1/60, 1/30, 1/15, 1/8, 1/4, 1/2, 1 秒 和 B快門
基於當前快門速度推薦光圈，顯示 F數值
B快門計時器最高可以到999秒
菲林計數，電池狀態顯示
標準熱靴，快門同步到 1/250
供電: 3200mAh 內置鋰電， 充電: DC 5V, 1A
菲林: Fujifilm Instax mini
菲林尺寸: 54 x 86 mm (寬 x 高)
圖像尺寸: 46 x 62 mm (寬 x 高)
外形尺寸: 158 x 65 x 116 mm (長 x 寬 x 高)
重量: 510 g