1902 Record Photography 223 



who are not unlikely to be put on the wrong track by the 

 photographic dealer, accustomed as he is to cater for the 

 snap-shot man. 



As regards choice of apparatus, all that I wrote in the May 

 number applies to the present case, both as to size and style 

 of camera. At the risk of being persistent I must repeat 

 that it is very seldom that a snap-shot will be of use, and 

 that in most cases the camera must be used on a stand. In 

 fact, for the class of work I now write about a rapid shutter 

 is not at all necessary, useful as it is for animal photography. 

 There is one explanation I should add to what I previously 

 wrote. It is now possible to obtain a camera racking out 

 to double the focus of the lens, and with every movement 

 desirable for architectural work, which is adapted for use on 

 a stand, but is also designed to be available as a hand camera. 

 Any objections which I have urged to a hand camera pure 

 and simple does not apply to such as this. 



The need for a long extension of camera is quite as need- 

 ful as it was for animal photography, and for architectural 

 work the camera must be provided with a swing back, or, 

 what amounts to the same thing, a swing front. As regards 

 choice of lens, an R.R. lens of the usual focal length for the 

 size of plate, or a modern anastigmat of the same focus, will 

 be the most generally useful, and if an extra one is added 

 it should be a " single " lens of a focus about half as long 

 again. It must not be forgotten that one of the combina- 

 tions of the R.R. lens forms a "single" lens of double the 

 length of focus, which is useful at times for taking an archi- 

 tectural " bit," which with the usual lens is too small on the 

 plate. I need scarcely point out that the longer the focus 

 of the lens the larger the size of the object on the plate, but 

 the smaller the amount of object (or angle of view) in- 

 cluded. 



I should advise plates of medium — not excessive — rapidity 

 to be used ; and if architectural work is included, it is well 

 to buy them ready " backed," which obviates that spreading 

 of light round windows — called halation — which so often 

 spoils a photograph of an interior. 



In geological photography, whether of outdoor " ex- 

 posures " (using the word in the geological, not the 



VOL. I. — NO. 3. p 



