Nauticam 45 viewfinder. What does the dioptre adjustment knob do?
Posted 07 October 2012 - 12:42 AM
Posted 07 October 2012 - 01:43 AM
Posted 07 October 2012 - 02:46 AM
Posted 07 October 2012 - 02:59 AM
I recently got a Nauticam 45 degree VF (for my NA-5D3) and it is a far better instrument than the INON 45 degree VFs which are fitted to my NA-7Ds. The image is brighter and crisper and with the dioptre adjuster I can compensate for my long range corrected vision because of the contact lenses I wear when diving.
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Posted 07 October 2012 - 03:21 AM
I'm trying to decide if changing to the Nauticam to get the dioptre adjustment would help me. Depressingly, I can see increasing long sightedness in my future!
Cuiously, I've not found the tiny adjustment knob on the back of my D90 viewfinder does much for me. Everything is best with the adjuster in the middle position.
Posted 07 October 2012 - 10:08 AM
AFAIK, the Nauticam diopter adjustment does just the same thing as the adjustment on the camera viewfinder which is of course not accessible underwater. Useful if - the adjustment on the camera got shifted and you didn't notice before putting in the housing; you swap eyes and and your eyes don't require the same correction or your prescription mask doesn't quite correct equally each side; you lend your rig to someone else underwater. In practice I can't remember ever using the diopter adjustment underwater.
As we get older (from about 40 on), our ability to shift focus from distance to close inevitably deteriorates - presbyopia - which is why most of us need reading glasses, bifocals or varifocals eventually. So I'm guessing it becomes more difficult to shift focus to the viewfinder image if this isn't at an optimal distance. I've read somewhere that SLR's typically present the viewfinder image at about 3 feet. The effects of presbyopia can also be mitigated by increased illumination which I'm guessing works by increasing our eye's depth of field although there may also be retinal effects. So a brighter viewfinder image - and perhaps a focus light - will also help.
I found the standard viewfinder on the Ikelite housing I had at the time almost unusable and changing to a Nauticam viewfinder was a revelation! I can't compare with the Inon viewfinder as I've never used one, but I do have both 180 and 45 Nauticams (I think I've stopped using the 180!). If you would like to see what they are like compared with the Inon, I can bring them to BUPG on Tuesday evening - let me know. I doubt the diopter adjustment itself will be a big help unless your D90's integral adjustment is faulty, but I couldn't live without my Nauticam viewfinder,
Posted 07 October 2012 - 11:06 AM
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