You are 100% true and I think the 100mm 2.8 is still the best choice. It was very late yesterday night when I have done this setup, but looking back to the picture I found that there is still a kind of linearity related to the subject from the front lens.
At 1:1 the distance from the front lens , the distance is almost factor 2x from each leach. At 1:3, there is ~26 inches front element 200mm 4.0 and ~14 inches for the 100mm 2.8. I'm thinking about if this is something the engineer desinging the lens wanted to achieved instead of calculating the focal plane of the film/sensor to the subject... ? But again, as you told, the 100mm is always a bit ahead in the distance.
I hope this test will help people looking if the return of investement to more than 3 time the price of the 100mm 2.8 on used market is intelligent to get this ~2x distance from the front element. For my experience I found that what scare the most the bug on the flower is the twin flash kit
In conclusion to this thread on my side, I'm hopping this lens will be purchase, meaning that If I'm selling mine next year I will be able to get a Zeiss lens for the difference I paid.
Regards,
Frank
Regards,
Frank
