kit fox wrote:
matt ignoffo wrote:
Are you sure the problem is just not enough light from the diffused sb600? F/16 @ iso100 with a good sized subject and 105mm lens seems like you need a good bit of light.
I didn't even think to consider GN when I came up with my suggestions.
Bingo. That's the problem exactly. We often assume that just because a flash has a larger guide number that it should be able to light things up close at high f/stops. Do the math.
Since you can't make your flash more powerful, try these things...
1. Why are you shooting at ISO 100? For many sensors built by Sony (including those in Nikon cameras) have a native resolution of ISO 200 which means that their least noise is visible at ISO 200, not ISO 100. ISO 100 is no worse, but just costs you light. Most modern DSLRs, particularly those with CMOS sensors can take excellent noise free photos at ISOs up to 1600 or better.
2. Why are you shooting at f/16? Yes, it does give you more DOF, but do you really need the edge of the stuff behind the animal to be tack sharp? Really? There are reasons NOT to stop your lens all the way down. One is that your lenses are sharper at lower f/stops and the other is the loss of light. If you can get adequate DOF at f/11 or f/13, why go to f/16? In this shot of a captive Eryx jayakari
, I stopped down to f/11 to make sure the head was sharp enough, but let the background be out of focus. I don't think having the sand or the coil behind the head in focus would add anything to the photo at all. In fact, I would argue it detracts by pulling your eye away from the subject.
As herp and macro photographers, one of the first rules we are taught is "stop down as far as your lens will go". I think that is generally a mistake. Stop down as far as you need to and no further.
Of course, YMMV and we all know what they say about opinions, but try opening up to f/11 (or dare I say it!....f/8) and see if your flash will have enough power and you get enough DOF.