As already mentioned in my last blog post, Sunday was a gray day but I spent some time in the “front yard studio” and practiced long lens shooting technique. We have lots of birds visiting our feeders with all the snow on the ground at the moment and I tried a few new things. Shooting directly from the front porch is not a valid approach right now. Sure, some “regulars” will still come close but the majority of our feathered friends stays away. I have the camera on tripod inside the bedroom (like in a blind) and since it was not as cold as earlier in January, the window was open. Because the window is 8-9 feet away from the edge of the porch I loose that much distance to my subjects, the little birds on one of the perch branches. To make up for that I attached the 1.4 teleconverter to the Sigma 150-600 S, which gives me an effective focal length of 850 mm. The best f-stop I can get is f/9 and that bares quite a challenge. The good thing is that the Sigma 1.4 and 150-600 S combination still works with autofocus, as long some contrast is provided to focus on. Both birds, the female Purple Finch and the Dark-eyed Junco have lines with contrast on their chest to lock on the focus. No, it doesn’t always work, autofocus is slow and the birds never stay long in the same spot.
The rest is easy. I use the MAGMOD MagBeam flash extender to throw a hint of light at the birds in order to overcome the gray overcast and bring out their colors. The Nikon D750 is capable of separating the exposure compensation for the ambient light and for the flash and after a few tests I found the right combinations.
Junco: camera +0.33EV, flash -3EV
Finch: camera -0.33 EV, flash -3EV
Having the roof of the porch for most of the distance between camera and the birds has the advantage that the flash will not hit a lot of snow flakes if used during snow fall. I like to have falling snow in the picture but too much reflection can ruin the shot.
Both images: Nikon D750, Sigma 150-600mm / f5-6.3 DG OS HSM S, Sigma APO Teleconverter 1.4x EX DG, Induro GIT 404XL tripod, Induro GHB2 gimbal head, Nikon SB 800 speed light, MAGMOD MagBeam flash extender, @ 850 mm, 1/200s, f/9, ISO200