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LTnlestj a.ti accessory prists is Btudwdj the viewing image is laterally reversed (:i o , revetisd leftto right!, iiuth viewing can br confusing at first: ful Lowing a subiecc seen to move toward the left edge of die vtewing screen requires turning the camera to the light Uccause the viewing lens has oo diaphragm, die depth dE field*1 of the viewing image heani no relation co that of the image Lin dim.
Since separate lenses are employed for viewing and phmngraph-lii£, tlie twin-lena design exhibits ch6 paralLii effect. Siniiiar field compensators to thute found un 35tmn rarigeHnder c.imeins arc often Used,. but here, ton, juxtapositions uf near ubjects against distant ime- are not corrected. When pieriiie alignment is required, we must move the camcra up so rhar the picture-making lens turves into the pnsitjon occupied by the vicwfioder lens during compnsi-tion and incusing.
Most twin-lens cameras aTe available only with "normai" lenses, ulthoifh HoLlei and rubers have marketed cameras or attachments to provide lung and shon local lengths Some Mamiy;L models permit interchanging lenses, by replacing the entire front panel containing both viewing and photographic kn^x
The twin-lens refkn hns been eclifarfd by the popularity of slngle-Eens reflex cameras. Excellent results are possible with some mudels uf this design, however, and they uftcn represent the Least expensive way for a photographer tn begm working in medium format.
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