This section is from the "Studio light a magazine of information for the profession 1918" book, by Sara F. T. Price. Also see Amazon: Studio light a magazine of information for the profession 1918.
Commenting on the proper care of lenses and their frequent abuse through lack of knowledge, the editor of the British Journal remarks: "There is nothing in which photographers differ so widely as in the way they treat their lenses, some regarding them as almost too precious to be handled, while others treat them with less respect than the carpenter awards his hammer."
He also adds that a lens should not be cleaned more often than is absolutely necessary; but it should never be used if there is the slightest veil of smokiness upon the surface.
The right way to clean a lens is to use a fine cambric rag moistened with pure rectified spirit.
Methylated spirit will not do as it is apt to leave a slight oily deposit upon the surface. The spirit should not be dropped upon the lens but upon the cloth, as in the former case there is always a danger of loosening the black around the lens cells and causing smears.
Avoid giving the lenses anything in the nature of a blow or a jar. It has often happened that a blow which has left hardly a mark upon the brass work has put a stress upon one of the glasses which has seriously affected the definition.
Likewise it may be well to note that whatever may appear to be a bad fracture of the glasses may be due only to the balsam having given way. We have known of lenses in this state having been laid aside as useless, when a small outlay for re-cementing would have restored them to usefulness.
The persistent advances in the cost of raw materials compelled us to advance the prices of our dry plates as at April 1st, 1918, the last preceding increase having been made on July 15th, 1915. Your stock house will be glad to give you the latest quotations on these goods.
While we are on the subject, we think it opportune to draw your attention to the advertisement for discarded negatives that has been running for months in Studio Light. We need them.
Overleaf is a new list of prices on Azo in single and double weights as well as Post Cards. This new schedule of prices went into effect Saturday, April 6th.
Studio Light for August, 1917, contained an article on page 3 entitled "War Prices," which set forth clearly the way we regarded the raising of prices and the article is worth re-reading.
Azo prices have been raised of necessity. You need no one to inform you as to the prices current for the commodities you use daily outside of your Studio and it is plain to see that such advance must make the cost of labour higher. Food and clothing, for example, are necessary to all of us and the man who depends on his day's pay for a living had to have higher pay in order to cope with the upward trend of all commodities.
Higher labour cost is an important tactor but not the only one to contend with. Consider and compare the market price of silver as it is given in the papers to-day with the corresponding figures two years ago or less. Remember, too, that silver is but one of the raw materials - none of the others have shown a downward trend.
We repeat - the new Azo prices arise out of necessity.
The Lejaren a Hiller Studios Courtesy of Harper's Bazar