First Dives with Tokina 10-17mm Fisheye

[aquakiwi]

I just tried my Tokina this weekend and I noticed I'm getting a curved reflection on the upper right of a lot of my pictures. It was an overcast day
and raining at the time the pictures were taken. I'm using a Canon 400D in
an Ikelite housing and 8" Dome.

[KenByrne]

Only a guess but it looks like a reflection of the port mount.

I've found reflections to be a problem with all wide angle lenses on the Ikelite housings. I think the clear port stem is part of the problem, but I don't know if this is the case with the 8" dome.nI've considered lining the insire of the port stem.

Looking at your shot there is some flare from your strobe in the top right, less so on the left. Strobe positioning is the most likely cause of the reflection. Try to get the strobes further back and pointing forward or slightly out, try to light the subject with the overlapping edges of the strobes light.

[Cussy]

Aquakiwi,
I've had the same. Thought I solved the problem, then it came back. Just over a week ago I attended Martin Edge's workshop at Ocean Optics and he said he has the front of his strobes no further forward than his goggles, and pointing outwards. I then put this into action at St Abbs, and guess what, not one single photo had bad back-scatter and no reflections.

So I'd suggest moving your strobes back so far it doesn't seem logical and see if you still have the problem.

HTH,
Rob

PS I thought the problem was the 6inch dome and managed to convince myself I needed the 8inch (I could also do over/unders then). Martin's comments made me think again and your post has confirmed it wasn't the dome - it was user error!

[aquakiwi]

I think your right, my strobe placement was as I've been using for my Sigma
10-20mm but the fisheye Tokina is a tad wider. Shots taken while zoomed in at the 17mm end didn't have the problem. I have noticed it with the the Sigma but only once or twice. Definately have to work on the strobe placement, thanks for the tips.

[aquakiwi]

Had another play around with the Tokina, I had the strobes angled out and it seemed to work a lot better, probably a little too much strobe in some cases. I also used a much higher ISO setting and tried a filter gel over the strobes to get more warmth in
the picture. This was a tip from UW/ Photo Mag and I'm quite pleased with the colours.

[TimIngmire]

Nice well lit photos. The only comment I'd make is to get the model to look at something other than the camera - it makes eyes look really odd when they do that. Of course if that was what you were after then ignore the comment.

Tim

[aquakiwi]

Still playing with the Tokina, this time in less than ideal conditions, I think I'm getting the hang of it, these taken in an Auckland lake whilst testing a new drysuit.