Maurillo
Registered
Hello all,
I'm seriously considering to upgrade my set (Panasonic ZT10 with Intova ISS2000) and go for a close-up wet lens. Mind it, I'm not planning super-macro, but I do like closeup-to-macro. I just want to make my life easier in approaching some animals. So, questions, first about better understanding how these lenses work:
- I understand magnification is achieved by zooming in/out with the camera, but: is there only a MAXIMUM distance to the subject, or only ONE distance where the lens can really focus? I don't want to experience underwater the old macro approach of moving the camera, to achieve focus...!
I'm definitely considering to choose the M67 format, which offers a decent spectrum of options, in terms of lenses and even adapters for my camera (but I'd better hurry up...). My most immediate choice would be the Inon UCL-165 M67 lens (a +6). However, reading Martin Edge's book The Underwater Photographer I discover that "if a wet lens' refracting surfaces are in contact with water, approximately two-thirds of its power will be lost underwater". That implies the above lens would become a +4...! :shocked2: The author continues then recommending lenses with the refracting surfaces sealed in contact with air, e.g. SubSee's +10 dioptre. Such power would however require a VERY close distance to the subject, which is probably not what I want.
Therefore, more questions:
- did I understand correctly that the Inon above would loose power from +6 to +4?
- are there other lenses around which are sealed in air? I'm aiming at a 5-6. Weird this thing is not mentioned anywhere: or are they ALL sealed in air???
- any other producer name/advice is much appreciated!!
Cheers
Maurizio
I'm seriously considering to upgrade my set (Panasonic ZT10 with Intova ISS2000) and go for a close-up wet lens. Mind it, I'm not planning super-macro, but I do like closeup-to-macro. I just want to make my life easier in approaching some animals. So, questions, first about better understanding how these lenses work:
- I understand magnification is achieved by zooming in/out with the camera, but: is there only a MAXIMUM distance to the subject, or only ONE distance where the lens can really focus? I don't want to experience underwater the old macro approach of moving the camera, to achieve focus...!
I'm definitely considering to choose the M67 format, which offers a decent spectrum of options, in terms of lenses and even adapters for my camera (but I'd better hurry up...). My most immediate choice would be the Inon UCL-165 M67 lens (a +6). However, reading Martin Edge's book The Underwater Photographer I discover that "if a wet lens' refracting surfaces are in contact with water, approximately two-thirds of its power will be lost underwater". That implies the above lens would become a +4...! :shocked2: The author continues then recommending lenses with the refracting surfaces sealed in contact with air, e.g. SubSee's +10 dioptre. Such power would however require a VERY close distance to the subject, which is probably not what I want.
Therefore, more questions:
- did I understand correctly that the Inon above would loose power from +6 to +4?
- are there other lenses around which are sealed in air? I'm aiming at a 5-6. Weird this thing is not mentioned anywhere: or are they ALL sealed in air???
- any other producer name/advice is much appreciated!!
Cheers
Maurizio
