I shot today with DA 55-300 PLM and the 1.4 TC,
Results were judged as "better than nothing."
As a stationary blind lens, it's a very nice walking lens. I doubt the TC helps it much. It did reasonabley well in the blind without the TC.
Juvenile white throated sparrow.
Mommy or daddy
Eating bugs is good for your health.
I think this guy just caught my hummingbird moth.
A pile of my red squirrels and flying squirrels have turned up dead recently... king squirrel remains un-affected..
Finches
The local weasel has taken a few chipmunks as well
Birds have to drink...
It was interesting to use the 55-300 PLM with the TC but shooting at 9.3 as you maximum aperture creates serious shutter speed problems. As well, compared to my other lenses, it's simply not as sharp. You can get away with it without the TC for a great portable option, but the TC just magnifies the softness.