Another wagtail post

Yet another wagtail themed post - this time a Yellow Wagtail at Barnes. This is my second of the year here, and this one, like the first in the spring, was also feeding around the feet of the cattle as they kick up insects. This time, though, it's feeding in longer grass so you can only see it every 10 minutes or so when one of the cows gives it a kick (or just gets to close) and it flies up.

None of the other recent goodies around - the sites had small numbers of Ring Ouzels moving through over the last few days and I've only been able to get her eon the days when they haven't been seen.

Also good numbers of Black headed Gulls (c190) with a couple of Common Gulls and small numbers of HG and LBBs around.

Wigeon numbers are still fairly low (9-10), likewise Lapwing numbers are a llittle down from usual levels at 35-40 birds, also c30 Gadwall, c20 Shoveler, around 8 Snipe, although they're being a bit skittish so hard to count accurately, Peregrine over the river, approx 4 Chiffchaffs including one doing a fairly flat 'weet' call. Just like a few days ago there are reasonable numbers of hirundines around: 25+ Swallow and 30-40 House Martins.

Since it's a bit quiet I thought I'd try an experiment and do a three way lens comparison. This means comparing the results of (1) the 400mm f5.6 lens with (2) a 560mm (400mm plus a 1.4 teleconverter) and (3) a digiscoped shot through the scope using a 50mm lens and using the 20x on the scope zoom. In theory this should give around 1000m but in practice it looked a little under, more like 980-990mm (assuming the 400mm focal lengths are right anyway). I’ve tried to pick out the best shot from a fairly short burst on each of the three options as a fairly rough n ready comparison.

This photo gives an idea of the distance - full shot from the 400mm

Baseline shot: 400mm f5.6, 1/640, ISO 16000

The following three pics are crops from the 400mm, 560mm and digiscoped shots. As usual these are cropped but nothing else.

Crop 400mm, f5.6, 1/640, ISO 1600

560mm (400mm + 1.4 MkII Canon), 1/250, ISO 1600

Digiscoped 50mm f1.8 (at f5.6) through Swaro 20-60x (at 20x), 1/200, ISO 1600

I think I'm getting a bit more detail (and better colour) from the 560mm shot than either the 400mm or the 1000mm digiscoped shot. The other take out seems to be that the 400mm is slightly forward focusing (the Mallard seems to be in better focus on the autofocused 400mm shot than the Wigeon).