cyberstudio 寫:
I just communicated with him by email and talked about his installation procedure. Our conclusion was that he shimmed the lens 0.21mm more than it should. Remember in the installation instructions, careful measurements are made to make sure the backfocus distance is maintained the same, here "backfocus" is defined to be the distance between the rear element and the film/sensor plane.
I am not sure if the VS24-85@85 still focuses to infinity when the backfocus distance is increased by 0.21mm, but even if not, this is a rather large deviation from the optical design and will likely negatively impact optical quality.
Morale of the story: you must be able to make measurements accurate to 0.01mm before you can perform the installation.
這點絕對同意........個人絕對不建議在沒有裝拆鏡頭經驗及在沒有合適工具下自行進行改裝工作, 若果大家在此情況下自行購買了 adaptor, 建議找合資格的師傅進行安裝, 最好是有能夠量度無限遠合焦儀器的
另外 iamderek 提及的於 VS 24-85 改裝時所需切除的兩條黑色塑膠 pin, 個人經驗是可切除至剩餘少於 1mm 的厚度而不需完全切去至平坦, 這有助於將來於還原鏡頭時電子接點盤與鏡頭主 mount 間作定位之用
P.S. 小弟膽粗粗改裝好後曾經拿鏡頭到尖沙咀的相機維修中心測試無限遠的合焦準確性.............幸好又算準確