This again is a bit like comparing apples to oranges. The 30mm has twice the angle of view and twice the depth of field V. the 60mm at the same F/number. The 30mm does not work with closeup lenses because of the close focusing distance while the 60mm works quite well with +5 to +25 amounts of magnification.
This is a bit like comparing the 7 mm end to the 14mm end of the Olympus zoom. Both work very well for what they were designed for. I look at the 30mm as a 1:3 or greater size lens while I look at the 60mm as a 1:3 or smaller size animal. If I am looking to do super macro 60mm is my choice Fabio's which are all in the appox .1:3 or larger range the 30mm works great. For an under $300.00US lens the 30mm has excellent image quality and is easer to use because of the wider angel and greater DOF.
I find the 30mm to be an excellent black water lens because the 60mm is a bit difficult to focus while I and my subject are both moving.
Bottom line is I would own both if you can afford to do that because they simply don't replace each other.
Photo is from a black water dive and the subject is a little larger that a US quarter, Larval Stage Sea Anemone, 30mm, ISO-200, F/7.1, 1/250th sec, two Inon Z-240 strobes, Nauticam housing and 45 port.
Sorry I am not so expert, but why you tell that the 30mm (Pana or Oly) doesn't work with wet macro lens ?
I made this picture of the Pigmy with the 30mm Pana + INON UCL 165 wet macro lens....
Where I am wrong ??
Edited by scipionems, 12 November 2017 - 01:42 AM.