Answer:
There are a couple of openings that your 600mm will fit through but most
of the openings will be too small. I can't remember the exact position of the
larger openings, but I think that they are at the two ends of each blind.
There are four blinds in total in two locations, at each location the two
blinds are beside each other. So effectively when you are in one blind there
is only one opening that you can use your 600mm.
You will probably be sharing the blind with two or three other people; it
tends to get crowded. The blinds are ~ 4ft x 8ft in size with a wooden floor,
if someone is walking around in the blind - everything moves. It is impossible
and impractical to use a tripod, either use a monopod or rest the rim of the
lens on the windowsill.
As for exposure, I normally use the sunny F16 rule, if you use F22 you will
lose all the detail in the black feathers, even at F16 you're pushing the limit
for the blacks. The rocks that the puffins land on are light in colour, and
can be really distracting. Are you going in the morning or afternoon? (They
only do one trip per day, but it depends on the tides when they leave.) The
light in the morning is MUCH better.
I have been there when the Puffins are so close that you couldn't even focus
on them with a 300mm F2.8, without using an extension tube. I have also been
there when even with a 500mm the puffins looked like little specks, that was
when I went too early in the season and the eggs hadn't hatched yet, so there
was no reason for the adults to bring food back to the nest. (That was around
June 10th - Now I go nearer the end of June, which generally seems to be a
good time.
Good Luck! If you have any more questions, I'll be glad to help out.
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