Athena OPD-100WZ

Hi,

I recently bought an Athena OPD-100WZ to use with my C-5060WZ / PT-027.

Does anyone have a user guide and/or technical specifications for this dome in english (or swedish)?

All I have is in japanese, and I can't even find any numbers that could be the dome radius or something similar.

From the name I'm guessing some measurement is 100mm, but I don't think that's the dome radius. I'm estimating that to be smaller - perhaps 80mm.

/Anders

Hi Andera,

Have you been able to get to this translated page? Hope it may help. Go to Olympus PT section.

http://translate.google.com/translate?hl=e...6lr%3D%26sa%3DG

Phil

Thanks Phil,

I had translated that page before, but I can't find info like dome radius and focusing range.

Although I did buy the WCON-07C I plan to also sometimes use the dome with just the camera's built in lens.

I'd like to get an idea about the operational range (focus distance).

The camera's closest focus distance (on land) is 20cm measured from some forward point in the lens. Only a fraction of that distance will be "used up" inside the housing.

If I estimate the dome radius to 8cm then this formula

L(inf) = 3.03 * r

gives me L(inf) = 24cm.

I haven't fully understood "dome theory" but it seems I'll have a very narrow operational range.

/Anders

I have sent e-mails to the Athena contact address and gotten prompt replies in english, you may wish to try them directly.

Phil

Have tried that as well. Suppose I can always try again...

Took the kit down to the sports club and did some tests in the pool.

d = distance from dome port to object (all in water, measured with a yard stick)

f = focus distance set by camera

f = 4,7142 x ln(d) + 4,2751

with inverse

d = exp(f - 4,2751 / 4,7142)

The measurements I did were pretty rough and the camera's AF was a bit "random" due to the dimmed lighting (and I forgot to bring my snorkel and mask) but when I plotted the data I saw a relatively good logarithmic fit.

Since the camera cannot focus closer than 20cm nothing can be closer than 30cm from the dome/camera.

For objects very far away the camera will set the focus at roughly 35cm (shouldn’t rely too much on the extreme point of the estimated curve).

Then…

Combining what I learned today with my previous DoF calculations I get:

Zoom to 27mm, set the aperture to 8 and focus at 20cm.

Picture should be sharp from 11cm to 157cm in front of the dome. Can this be correct?

With aperture 5,6 I get 14cm to 82cm.

And with 4: 16cm to 57cm

2,8: 19cm to 45cm

Using the WCON-07C wide angle converter should give me even better DoF.

Comments?