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  1. Blackwood

    Redondo Artificial Reef Report

    Nice. Fun dive for such a mundane wreck. I'd like to get back there. As usual, thanks for sharing.
  2. Blackwood

    Too large of a sensor??

    Sensor size doesn't really affect DOF (which is an optical property). More appropriately, in order to achieve the same composition with a larger sensor, you either need to get closer or use a longer lens than with a smaller sensor. That's why DOF is "reduced" - they're comparing different...
  3. Blackwood

    Agencies?

    I noticed the same thing after my roughly year long absence as well. But this place has a way of sucking you back in. Run while you still can!
  4. Blackwood

    Agencies?

    Yep. Mainly, my content label is the easiest thing to see if there are two bottles hanging there - may need to lift a bottle in order to see the MOD label on my side. I try to use the most foolproof method consistently (i.e. even if there's only one bottle), and lift the right bottle first. But...
  5. Blackwood

    Agencies?

    Word. I like that better, but you know... different strokes for different folks. People who aren't doing 90 minutes at depth. Not I, however - 300 is far deeper than I'm qualified for. What math? I know what gas I need to be using at my switch. When I hit 70 feet, I don't go "okay, okay...
  6. Blackwood

    Agencies?

    UTD standard deco gases are: 100%, 50%, 35/25, and 21/35, and are the bottles are marked as "20 OXYGEN", "70", "120" and "190" respectively (imperial units). In the UTD Lexicon, an unmarked "stage bottle" contains bottom mix - it's breathable as deep as you're going to go. As to why they...
  7. Blackwood

    Agencies?

    They teach to mark deco bottles with MOD labels, but not stage bottles. And all bottles have content labels.
  8. Blackwood

    Agencies?

    Elephants
  9. Blackwood

    Canon EOS T2i and Setting White Balance Underwater

    In general I agree, but "always" is the wrong word. For example you can maximize your signal to noise ratio by intentionally overexposing when shooting and then adjusting down in post, thus improving shadow detail. WB is something that can be adjusted losslessly in post (assuming raw capture)...
  10. Blackwood

    Which Lenses for Video - Canon 600D

    Here's a new option: Tamron -Tamron announces the redesign of their legendary 90mm Macro lens, equipped with VC (Vibration Compensation) and USD (Ultrasonic Silent Drive) - SP 90mm F/2.8 Di MACRO 1:1 VC USD (Model F004)Tamron SP 90mm F/2.8 Di MACRO 1:1 VC USD September 13, 2012, Saitama...
  11. Blackwood

    Questions on ScubaPro Jetfins

    ^^ yep, they come in 'tiny', 'usable by most' and 'hotdog down a hallway'. I seem to recall them adding a new size smaller than a house, but don't know much about them.
  12. Blackwood

    Questions on ScubaPro Jetfins

    Again, it depends on the boots you're sticking in them. That's most likely going to work, but if you have a particularly large boot it may not. I'll have to look what my boots that don't fit the XLs are.
  13. Blackwood

    Which Lenses for Video - Canon 600D

    In general, jacks of all trade (the most popular likely being Nikon's 18-200) are generally pretty good in the middle, but compromise at the extremes. I see you have the Tokina 11-16mm and 12-24mm on your list but not the 10-17 (which sinistar mentioned). I don't know anyone who has that lens...
  14. Blackwood

    9/11

    I was packing up my hotel room to fly home from cancun. Finally made it three days later by flying into Tijuana and walking across the border. I also saw the second plane hit live, and both towers fall. It's something I'll never forget.
  15. Blackwood

    Which Lenses for Video - Canon 600D

    Has anyone ever used Canon's MP-E macro lens underwater? The one that allows 5X magnification? It would probably be a bear to use, but you could get some spectacular critters with it. Edit - never mind, it would be next to impossible. The magnification completely obliterates the aperture. Per...
  16. Blackwood

    Which Lenses for Video - Canon 600D

    Irrespective of price and quality, I'd go for the 11-16 for underwater use. Cameras need light to focus. AF at 2.8 will likely be snappier and more accurate than AF at 3.5 (note that unless you're using a lens with an aperture ring, your camera focuses wide open regardless of your exposure...
  17. Blackwood

    Which Lenses for Video - Canon 600D

    (I didn't detect any snarkieness; no worries) Wider aperture and likely better quality due to fewer optics in a prime vs a zoom. Wide angle lenses are notoriously hard to build. Preventing distortion is difficult. Adding zoom capability complicates it. I've not used any of the lenses, nor do...
  18. Blackwood

    Which Lenses for Video - Canon 600D

    Depends on how close you are. I merely suggested the canon prime because it's wider than any sigma prime and I was trying to replace two lenses on your list with one. I was however being video-centric (somehow I read te thread in that mindset). For stills, the zoom certainly offers flexibility...
  19. Blackwood

    Which Lenses for Video - Canon 600D

    Personally I'd ditch the wide zoom in favor of a nice ultra-wide prime (in the case of Canon's APS-C, ultra-wide is 15mm or wider). I'm guessing you'll have your focal length in set-and-forget mode anyway, especially if you take the above advise to stop down and aim for the hyper focal length...
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