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Stig

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Stig last won the day on December 6 2017

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About Stig

  • Rank
    Clownfish

Additional Info

  • Show Country Flag:
    United Kingdom
  • Camera Model & Brand
    Sony NEX5
  • Camera Housing
    Mauticam
  • Strobe/Lighting Model & Brand
    Sea&Sea YS-25
  1. There are a couple of articles describing the technique. A non-technical one: https://www.scientificamerican.com/article/sea-thru-brings-clarity-to-underwater-photos1/ And a technical paper for geeks like me: http://openaccess.thecvf.com/content_CVPR_2019/papers/Akkaynak_Sea-Thru_A_Method_for_Removing_Water_From_Underwater_Images_CVPR_2019_paper.pdf
  2. Sorry, I can't see what to click on there either. Sea&Sea Motormarine MX10
  3. I tried a cheap +10 dioptre "close-up" lens in water and can confirm that it does work. Sure, you don't get +10 in water - it's more like +4 but that can still be useful. Having had a play with it on a couple of trips I then bought a 'proper' Nauticam CMC with flip holder and that's got noticeably better corner sharpness and a bit more magnification but it was the flip holder that made it worth the money. Be careful if you try using a dioptre inside the port that the combination still fits and doesn't hit the glass port when zooming or focussing as getting any scratches out would be a pain.
  4. I've been using an Oceanic mask with bifocal lenses - top 2/3 is flat, bottom 1/3 is +1.75 dioptre (or similar) for a few years now (I tried the XS Scuba one initially but it didn't fit my face very well so sold it on). I find that in good light I can look through either part to see the reef but need to look through the bottom part for the camera screen. In poor light (esp. night dives) it's a bit restrictive as I can only see the reef clearly through the top part (unless it's really close but I don't like to be that close in case I hit something ) The idea of only correcting one eye wouldn't work for me as I'm very left eye dominant and never get a sharp image with just my right (lazy) eye.
  5. Kevin at Aquaphot was recommended to me: http://www.aquaphot.co.uk/ He was very helpful when I called him about my old YS-25A a couple of years back (sadly there aren't any spares for it any more).
  6. I just meant that 1/2000s shutter might be cutting off some of the strobe pulse which is about 1/1000s long (well, that's what mine are). Strobe power settings generally work by shortening the pulse duration so a big pulse from a more powerful strobe at, say, half power (i.e. duration) would work better that a full duration pulse from a weaker strobe when using such a fast shutter speed. Probably a pretty rare issue in practice though.
  7. Cool, that makes sense. I didn't realise the RX100 could flash sync at that fast a shutter speed, I guess it's down to electronic rather than mechanical shutter. Mind you, 1/2000s is going to start cutting into the flash duration requiring you to have a more powerful flash to compensate...
  8. Really? It's a smaller sensor than full frame so gets fewer photons. For the same sensor technology a larger sensor is always going to have better sensitivity. The difference in f-stop is down to the different focal lengths required to get the same angle of view.
  9. Couldn't you just get a 67mm one and fit it on the wet side of the port (assuming you already have a 67mm thread there)? Then you could rotate to your heart's content.
  10. I have the right upright close enough to the housing (Nauticam NA_NEX5) that my index finger can still reach the shutter lever without much of a stretch - I can still just get the other fingers in the gap to hold it securely. Not sure if that's do-able with a housing having a button rather than a lever though.
  11. If you try looking through the diopter lens with your eye and move it closer / further away you'll find it doesn't make much difference until it's quite some distance from your eye. I did have all the optics equations somewhere but a practical demo will have to do for now!
  12. I attached a small clip to the wrist lanyard so I can clip it to a chest D-ring and poke the other end between the BCD cummerbund and waist strap. Seemed to keep it out of the way without it digging into me or anything else when I wasn't using it.
  13. Yep, the only budget option I can think of involves a 3D printer and a lot of free time. I did try a DIY approach using a 58mm +10 close-up lens screwed into a 72-58mm adapter ring mounted on a plastic lid which worked (though with soft corners) but was cumbersome to take on and off the port. I eventually paid the money for the flip adapter and CMC.
  14. What's the advantage of using a fisheye lens with a teleconverter? To the uninitiated (i.e. me) it just turns a 15mm into a 21mm but I'm guessing there's more to it than that...
  15. I found this useful when I was researching close-up lenses: https://www.scubageek.com/articles/wwwdiop.html
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