Hints And Notes Practical And Scientific for Travellers in the Alps Being a Rev
Hints And Notes Practical And Scientific for Travellers in the Alps Being a Rev
John Ball
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Obviously with this high magnification any vibration becomes evident in the negative. Accurate focussing, both by means of the rack and pinion on the lens and finally by the camera pinion, is necessary, and a focussing glass should be employed. The focussing should be done with the actual stop used. In distant photography with this lens it is always wise to use an orange screen. It is necessary to remember that, owing to the narrow angle embraced in these views, it is advisable to choose a poin...t of view as nearly level with the object to be photographed as possible, otherwise the angle to which the camera must be tilted results in great distortion of the per- spective. This to some extent limits the usefulness of the lens. No precise rules can be laid down here as to the comparative length of exposure necessary when photographing an object with an ordinary rapid rectilinear lens, and with the same lens used with a negative lens to form a telephotographic combination, as this must depend upon the length of camera extension and the degree of stopping down that maybe necessary.
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