Hi Allan,
I use the GFX50R and I am thinking of buying a tube like that to use with the GF 120mm macro and also test with the GF50mm. I know that 18mm + 45mm tubes can be used together. It never occurred to me to use two equals, as you describe.
I would like to ask you with what objective you use them?
With what results?
What expansion do you achieve with both?
Can we see examples?
Thank you very much.
Best regards.