These two subjects are the ones most suitable for instantaneous work. Sea scenes with yachts, ships, boats, etc., in the foreground require exposures lying between these two.
The heading of the next column, "Landscape with heavy foliage in the foreground," if taken in conjunction with what we have just said, explains itself.
In connection with it, it is well to say that green is a colour which does not have a very energetic action on the photographic film, and that if there be trees or shrubs—especially those of the evergreen nature—in the foreground the exposure must be long.
" Under trees, up to " is what is given in the next column. We may say that the exposure of woodland glades, and such scenes as are entirely under the cover of foliage, is much longer than would be imagined. A great portion of the light is entirely shut off by the foliage, and a great portion of that which penetrates has been filtered through the leaves, and is of a green colour.
The exposures which are given in this column would be required under trees even when the subject appeared to a person who had been for some time in the shade to be pretty good.
The interiors must be taken as those of cathedrals, churches, etc.
The portraits out of doors are supposed to be taken under such conditions as will be described in the chap ters on portraiture.
The exposures in studios are such as would be re quired when a somewhat large portion of the glass is left uncovered.
The portraits in ordinary rooms are supposed to be taken under the conditions which will be described in the chapter on portraiture.
Where there is a very large window the exposure may be only one-half that given, or where there is a bow window it may be only one-third.
We may say that all the exposures will be found to apply rather to work in the country, or in small towns, than in large towns. The atmosphere in large towns, and especially in London, is always more or less yellow. It is only in exceptionally fine weather that exposures of less than double those given will suffice in London.
The remark concerning yellowness of atmosphere ap plies to all parts, both of country and town, for certain parts of the year. During the winter months, when the sun never rises high above the horizon, it will be found necessary everywhere to give two or three times the exposures mentioned.