Florian, Torquay.
P. S.--In answer to a COUNTRY PRACTITIONER, he will find great assistance
in choosing his lens by laying it on a sheet of blue wove post paper, when
he will immediately perceive the slightest yellow tinge in the glass, this
being the fault which frequently affects many well-ground and well-made
lenses. Of course, for sharpness of outline he must be guided entirely by
experiment in the camera; but where weakness of action exists, it most
frequently arises from this yellow colouration, and which the manufacturers
say is very difficult to avoid.
[MR. LYTE having sent with his communication a positive prepared in the
manner described, we are enabled to corroborate all he says as to the
richness and beauty of its tints.]
_Cheap Portable Tent._--M. F. M. inquires for a cheap and portable tent for
working collodion out of doors. I have been using one lately constructed on
the principle of Francis's camera stand. It has a good size table, made
like the rolling patent shutters; and it is not necessary to stoop, or sit
down at your work, which is a great consideration on a hot day: you may get
them of any respectable dealer in photographic apparatus; it is called
Francis's Collodion Tent.