philosophy

On Batteries

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ABC: Always Be Charging

–Mike

Batteries are my personal nemesis that I’ve learned to work with over time, and I think that most underwater photographers also have a love-hate relationship with them.

My problems with most batteries:

  • Chargers take up space in your bags
  • Different types of devices have different batteries
  • Battery chargers usually come with a power cube of some kind
  • Some chargers have “fixed” plugs that don’t let them pack nicely
  • Batteries are heavy
  • Batteries have to be in your carry-on baggage
  • Batteries usually can’t be seen through on x-ray because they contain metal
  • Batteries heat up when they charge
  • Hot batteries in a sealed device create vacuum and offgas issues
  • Batteries will last for 2.5 dives on average and that third dive might run out
  • You can’t take photos with a camera that has dead batteries
  • You can take photos if one or two of your 4 light sources dies

Out of all these considerations, I have this strategy for batteries:

  • Have enough batteries for 1.5 days of photography
  • Minimize the amount of chargers that I have to take with me by standardizing on just a couple of battery types
  • Whenever possible, have chargers that plug into USB
  • Always Be Charging: batteries on the charger are one of the first things that I do after every dive
  • Take an extra set of batteries on the dive boat
  • Have 2 containers next to the charging table: one for empty batteries and one for full batteries
  • Whenever I’m not taking photos (hunting for subjects or waiting or on the boat), I shut off my camera, strobes, and focus light
  • I try to resist the urge to look at photos on the boat unless we’re headed back to the dock although sometimes I fail at resisting
  • I carry 2 spot-beam dive torches for tech-diver redundancy and to use as a macro torch
  • I have redundancy between my strobes, focus/video torch, and handheld dive torch so I don’t really need a full set of extras for strobes
  • If you’re diving with a guide, you will take more photos and will use batteries faster
  • If you’re doing 3 dives plus an early morning or night dive, you’ll need more batteries because they won’t charge fast enough
  • Chargers can go in checked baggage

And finally, my dive trip packing list:

  • 4x 18650 (2 handheld dive torches plus maybe the ScubaLamp MS-30 snoot torch)
  • 2x 26650 (1 focus torch)
  • 1x 14500 (dive computer)
  • Nitecore 4-bay charger for 18650, 26650, 14500 (it has a straight cord with no power cube) (in checked bag)
  • 12x Eneloop Pro (2 strobes and each holds 4 batteries, I don’t take a full set for 2 days because it’s just too many to carry) [See Note Below]
  • 2 Eneloop 4-bay chargers with folding US plug (in checked bag)
  • 2x Camera Battery (either TG5/LI92B or G9/DMW-BLF19)
  • USB-powered single-bay charger for camera battery
  • 2-bay USB charger for phone, tablet, batteries
  • Waterproof bag or box for the boat: I have a dive mask box that seals and is the perfect size for batteries and my phone
  • Extra bag for batteries in my carry-on so I can can just put them into an x-ray tray at airport security

 

 

See You Underwater

–Mike

 

[1] You’re maybe not supposed to put Eneloop batteries into a sealed device: opinions vary on this.  You can read more at WetPixel.  I hedge my bets by never ever using batteries right off the charger that are warm.  This is why I get them on the charger early so that they have time to cool.

Macro Lenses for Micro 4/3

Posted on by in philosophy, underwatermacro and tagged , , , , , , , .

Very good comparison video of macro lenses for M43.  Makes me think a little bit more than usual….

I think that just about everybody doing underwater macro with a M43 (Panasonic G9, GH5, etc and the Olympus OMD-EM1/5/10) is using the Olympus 60mm Macro.  I haven’t seen any debate about this at all.

The reason that we all use the 60mm is because more magnification is good and the image quality of this lens is good.  And hey, that’s what everybody else uses, so why not?  However, I wish there were other good M43 macro lenses: a 100mm or 120mm would make me very happy although it might not be useable underwater.

But, we also have wet diopters (wet lenses), and they change the lens game considerably.  I myself have both a Nauticam Supermacro converter SMC-1, a Saga +5, and an Inon super-wide macro (bug-eye).  I’m have the additional magnifier for the SMC-1 coming next week for even better supermacro, although for the past 18 months I’ve been a heretic and stacked the Saga +5 on top of the SMC instead because the price is right.

My thinking goes like this:

  • It’s harder to focus underwater because of less light.  This means less contrast for autofocus.
  • It’s harder to focus underwater because current and surge: you and your subject are constantly moving in large and small amounts.
  • It’s harder to focus underwater because well, you’re underwater and breathing through a hose.
  • A 30mm or 45mm macro lens plus wet diopters is an interesting option, especially if they have a faster autofocus.  If you can shoot closer and/or use wet diopters, then you can even get to supermacro.
  • A macro lens at a wide F-stop (F2.8 for most macro lenses) means a thinner plane of focus.
  • Adding a wet diopter makes a thin plane of focus.
  • Stacking wet diopters makes a very very thin plane of focus.
  • I usually end up shooting at F22 with stacked diopters to increase my plane of focus as much as I can.  Obviously, this changes my exposure so I have to compensate in shutter speed, strobe power, or ISO.
  • It is very common for the lens to be able to focus in front of and beyond what the wet diopter is capable of.  IE, the focus range of the lens exceeds the focus range of the diopter.  This adds to difficulties in autofocus because the lens hunts in places where it cannot focus.  Using a limiter switch on the lens (the Olympus 60mm has one) helps because it eliminates the hunting in the longer ranges.
  • Focus lock helps a ton with wet diopters because it almost eliminates out-of-range situations unless you’re setting a new focus.
  • For larger subjects (shrimp gobies, garden eels, larger crabs, scorpionfish, etc), diopters can also be unscrewed or swung out of the way with a hinge.  I use a hinge for the SMC-1.  I screw the Saga +5 on and off because it doesn’t have a downsize threads to fit the front end of the SMC-1.  Screwing on and off is not a quick process.
  • If you remove the diopter, then the focus is further away, so using a limiter switch on the lens means that you maybe can’t focus at that longer length.  So really, using the limiter switch is a tradeoff between autofocus speed and being able to take pictures of larger subjects.
  • You absolutely need to try all of the options available to you before you do it underwater.  Dry-land training is huge.

What’s the point of all this?  Well, everything in photography is a tradeoff.  The more you understand what decisions you’re making, the more you can adjust when things don’t work out the way you intended.  And I’m a huge believer in being able to adjust to conditions and just keep shooting.

 

See You Underwater!!!

–Mike