Yes, it’s Tuesday; but I was on a plane and then pretty jet lagged yesterday. Anyway, today’s moth is one from my Salton Sea trip two weekends ago. These moths were common on every built up surface in every campground. Best guess is that this is Perizoma custodiata, Hodges# 7328.
Mecca Beach Campground, Salton Sea, 2009-03-21
I visited Brooklyn this past weekend. Despite jet lag, rain, and wind, I managed to spend a few hours in Prospect Park and picked up 39 species including 15 year birds:
However, I did not find the Red-necked Grebe or the White-winged Crossbills that were reported earlier in the year.
Many-spotted Angle Moth, Hodges #6395, Digrammia irrorata
William R. Mason Regional Park, 2008-03-05
Details and pictures to follow but here’s the day list:
Pseudoschinia elautalis, Hodges#4828
I found this one in the shower at Agua Caliente County Park, which is built at hot springs in the desert. Kudos to John Lee for the ID.
Allegedly my Tamron zoom lens has a 1:3 macro capability. That is, at maximum telephoto and minimum focusing distance (0.49 meters) objects should be imaged on the sensor at 1/3 their actual size. Let’s check that out.
The sensor in a Canon EOS 50D is 22.3mm by 14.9mm. A U.S. quarter has a a diameter of 24.26 mm. I extend the lens to 300mm and switch it to manual focus. Then I set the focus on the lens to 0.49m (the minimum). I move the camera until the quarter comes into focus and snap.
At 1:3 the quarter should occupy 24.26/3 mm == 8.087 mm. 8.087 mm/ 22.3mm = 0.36, just a tad more than a third the width of the picture. Actually it could be a little smaller than that if I didn’t shoot it head on. The raw image is 4752 pixels wide, so the quarter should be about 1710 pixels wide. Let’s open it up in Photoshop and find out.
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