flavitie

Saga could be another option, I use the +10 , it has good quality for the price, there are also +5 , +15 and a trio compbined system.

I am looking for a Subal ND600 housing in good shape for my Nikon D610 camera, with or without ports and accessories. Ciao, F.

I have seen morays, sharks and groupers hunting for lionfish... maybe lionfish are growing in number because these predators are less?

I have seen diving operators advertising dive sites where divers could catch 'infestant lionfish' and then use it as a bait to attract sharks and other species. Has anybody seen this behaviour during some dive? Have to say that it seems quite wrong to me...

I think that uw photografers in general, while of course there are exceptions, are more aware of how to dive correctly in order to avoid damages to marine life and have on average a correct buoyancy control. Perhaps diving instructors and diving guides have the hardest task in teaching new and occasional divers how to interact and how to move underwater...

Richard, Gerard, thanks for your answers. No doubt that filters would be very useful if no WB / raw info is available for the images and to speed up video processing... I've seen the 3 wreck photos, Alex explains them very well in his latest book (what a greeeeeat book)... even so I am not fully convinced that you could not get the same results applying software filters in post processing, I guess I should just try one of those magic filters and shut up. ;-)

I am a bit puzzled about magic filters. I must say I have not used any so far, but I do not understand the point. I mean, which is the advantage of applying a filter to block/attenuate some of the incoming light frequencies? Would not it be easier and more accurate to act in post process on the raw file by balancing the color channels (or doing white balance)? Furthermore each magic filter is designed to work well only at certain water depth/light intensity/water colour... Or did I miss the whole point? Anybody could explain? ciao, F.

I like the photo of the ring, somehow I feel it looks better if you turn it vertical (leaving the ring on top and the small bubbles below) Second turtle is much better for its composition and since it has more color on the turtle itself. Agree with stopping down the over-under for depth of field and perhaps I would prefer a bluer cast of the water. ciao,F.

Thanks again Adam for your comments, very clear. Beautiful the eye contact in your pic. Were al tiger sharks those on the background? Ciao F.

thanks Camel. great picture!

Adam, do you mean this: http://www.kenkoglobal.com/photo/lens_accessories/teleplus/teleplus_pro_300_af_14x_dgx.html or this: http://www.kenkoglobal.com/photo/lens_accessories/teleplus/teleplus_mc4_af_14x_dgx.html thanks again for your advise. Ciao, F.

Adam, many thanks for your advise. In fact as far as I understand using the TC will reduce the field of view and increase the working distance at same magnification, perhaps I got it wrong. I will try to borrow/rent one to see the effect. Ciao, F.

It is an old MIR lens

Thanks for your reply. Fisheye leneses can be used with a teleconverter to take some close focus wide angle, taking advantage of the close focus capability of the sigma 15 in this case. ciao, F.

Thanks for your feedback. Here's another example, I like the 'explosion' effect of the spikes of the sea urchins, to get this kind of blur I use the lens full open, so the depth of field is short, perhaps it is too much since the urchins are not sharp enough.