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Hi Lukas,

An interesting image.

For special shots, like macros, the Details are important in order for me to rate the technical merits of the image captured.

It is not possible to provide any tips when there is no support information given.

I (own) have tested the Tamron 90mm F/2.8 lens in the optical  lab and in the field. I have seen better performance from the lens, but there is no way I can relate any of my findings with your parameters that are unknown.

You are welcome to email me with the details, and I will respond back to you. 

Best Regards,  Mike

thank you for comment, but i made mistake with equipment, it was Canon MP-E 65, sorry for this