Wet Diopters and Internal Focus Lenses

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Postby danclem » Mon Jun 21, 2010 9:21 am

Hi All:

Looking for some help/information about wet diopters and internally focusing lenses such as the new Nikon 60mm and 105mm. I shoot with Subal housings and ports, and Nikon D300 and D300s.

Are there any issues to be aware of in moving to internally focusing lenses? Since the lens length stays the same, I am guessing that there will be a greater distance from the end of the lens to the port. How does this impact using a wet diopter placed on the outside of a flat port?

Thanks for any help!

Dan
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Postby scottg » Mon Jun 21, 2010 10:01 am

hey Dan - I haven't had any issues with wet diopters and the new 105mm lens.

Actually, I find that the ports allow these lenses to come closer to the end of the port, not further away. That is definitely the case with my Sea & Sea port for the new 105mm lens.

Just make sure you get the correct port for the lens you use.

Are you getting ready to try some supermacro?

Scott Gietler Owner/Editor, Underwater Photography Guide & Bluewater Photo http://www.uwphotographyguide.com http://www.bluewaterphotostore.com

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Postby bvanant » Mon Jun 21, 2010 5:36 pm

danclem wrote:Hi All:

Looking for some help/information about wet diopters and internally focusing lenses such as the new Nikon 60mm and 105mm. I shoot with Subal housings and ports, and Nikon D300 and D300s.

Are there any issues to be aware of in moving to internally focusing lenses? Since the lens length stays the same, I am guessing that there will be a greater distance from the end of the lens to the port. How does this impact using a wet diopter placed on the outside of a flat port?

Thanks for any help!

Dan

Actually if you have the correct port, there is a huge advantage of not having an extending lens. On my Subal system with the correct ports (different for the 60 and the 100) there is only a few mm between the end of the port and the lens. This will allow you to get the maximum value from your lens in terms of maximum (1:1) magnification. One point to remember that an external diopter will be much much more useful on the 100 than on the 60. Much more magnification is possible.

Bill

Bill Van Antwerp Canon/Nauticam/Subal/Inon Lots of glass


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http://www.blueviews.net

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