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JohnLiddiard

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JohnLiddiard last won the day on October 29 2021

JohnLiddiard had the most liked content!

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About JohnLiddiard

  • Rank
    Moray Eel
  • Birthday 02/25/1960

Contact Methods

  • Website URL
    http://www.jlunderwater.co.uk

Profile Information

  • Gender
    Male
  • Location
    Bristol
  • Interests
    Freelance photographer and journalist working mostly for Diver Magazine. Lots of UK wreck diving, but also like to travel and snap pretty marine life. Rebreathers.

Additional Info

  • Show Country Flag:
    United Kingdom
  • Camera Model & Brand
    Nikon D200
  • Camera Housing
    Subal
  • Strobe/Lighting Model & Brand
    Inon Z240
  • Industry Affiliation
    Freelance photographer

Recent Profile Visitors

3542 profile views
  1. I always keep rechargeable batteries together in sets. For strobes in sets of 4. A set stays together for life. If one battery in a set plays up, I retire the set and use the remainder for applications that don't matter, such as powering a mouse or TV remote.
  2. As a photographer, I wouldn't harass a puffer fish to make it puff. However, if I come across one that has already puffed of its own accord, I don't think taking a few shots is unreasonable. The problem arises when a train of 30 photographers all take turns for a few shots, when it turns into a collective over-harassment. The same applies to most subjects. As far as the biology is concerned, there are many species of pufferfish. Any report on the biology needs to be clear on the species concerned and why the observations can be generalised to other species. Data such as 'time before it can eat' needs to be qualified by how frequently and what time of day a species would normally eat.
  3. When you read the data sheets about cutting, perfect square, no fractured fibre edges etc, that is all aimed at the main use of fibres for transmitting data at giga bits over 1000s of miles. For simply directing a 'fire' pulse over 1m, such precision of cutting is irrelevant.
  4. Think of the waterproofing as a secondary line of defence when using it inside a housing.
  5. For the future, a wet conversion lens is not tied to a specific manufacturer's primary lens mount. You won't be so tied in financially to a manufacturer or primary lens mount when you next update your system. Wider is not always better. A full fisheye can often be too wide, either for subject/composition or because strays get into the edges of the shot you don't realise at the time. A good wide angle at 120 to 130 can be both more flexible as a lens and easier to use. Use a WWL for that and the flexibility of swapping during a dive is a bonus.
  6. I have lanyards attached to my wet lenses. I have never had to rely on them, but it does give peace of mind. Admittedly I have bayonet connectors, so lanyards are not as complicated. On a threaded connector either the lanyard needs to be longer or to slide round as the lense is screwed in/out.
  7. If it were back in the days of film, I would be guessing the camera had been left with the lens pointing into the sun and hence burned. I wonder if the same could happen with a digital sensor?
  8. That sounds like an interesting solution and avoids the cost of right angle plugs as well as the requirement for more expensive cable to fit into right angle plugs. What minimum bend radius did you achieve?
  9. The best result I ever got was by creeping up the down-current edge of a sand bank in a screaming current. That was on open circuit. Rebreathers, while bubble free, still have a noise of breathing. The time I tried in zero current with a rebreather was not successful. Given the opportunity, I would try the tripod + cable method Alex used. But that has the disadvantage of not being able to actually compose the shot.
  10. Has anyone experimented with alternate ways of implementing a 90 degree connector? Rather than bending the cable, which requires expensive multi-core cable to get the bend radius, could a connector be built with a tiny mirror in it? The idea is, use a cheap and reluctant to bend cable such as toslink, then have a connector with tiny mirror in the end to get a 90 degree reflection into the strobe optical receiver or out of the camera optical port.
  11. The boat will drop you where the skipper hopes they will swim and you hope for the best. They will move faster than you can. Plan to be maneuverable and warm rather than fast in the water. Get some dry gloves and practice using the housing while wearing them. Take a decent snorkel. Any full animal shot will be beyond strobe range and dependant on dingy natural light. As already said, high ISO. If you are allowed strobes, they will only be of use for smile shots if they swim close enough. I did a trip a few years back and had some excellent wreck diving, but no luck with orcas in the water. We only saw orcas on 2 days and never close in-water for good pics. Most trips are luckier than I was. Take a second camera with tele lens for surface shots.
  12. Why chase higher GN strobes when modern sensitive cameras already solve the same problem for free ? Guide numbers were important to me when cameras were noisy above 100 ISO, but that hasn't been the case for years. Rather than worrying about a more powerful strobe, I work with a slightly higher ISO. To me, the only use for high GN at full power is to overcome natural light for wide angle in shallow water at mid-day - and I can work round that by using a higher shutter speed or shooting WA earlier/later in the day and shooting macro at mid-day. At any depth shallow enough for natural light to become a problem, the light is nicer when shooting earlier or later, especially the dappled surface an hour or so before sunset. Reliability is more important than anything. Then compact/weight for travel. Then angle of coverage and GN gets balanced against further cost. The only thing a higher GN would bring is shooting even longer bursts at even lower fractional power.
  13. Barring another source coming up in the meantime, I am still in if it takes longer to organise. Thanks for your efforts in trying to get this together.
  14. Tim, I think I have PM'd you, but I am not sure of that as I am not a regular user of PM here. If not, you should be able to Google me easily enough.
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