Focusing prism

Started Jun 8, 2014 | Questions thread
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BrentA New Member • Posts: 2
Focusing prism

I have a Nikor 105 Macro lens that is 15 years old.  It works great in manual mode for my digital Nikon D7000.  As I am getting older, my eye sight is not what it use to be and it is getting harder to see when things are in focus.  I know the older (pre DSLR) used to have a focussing prism in them that you would match up cross hairs when your subject was in focus.  Are there any prisms that I can have installed that would do the same?  I really do not want to spend the money on a new lens and without my glasses, the adjusting diopter just does not do the trick for me any more.  I have progressive lens on my glasses so just the slightest movement of my eyes through my glasses can change the focus of my eyesight.

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