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tele-positive
tele-positive n. and adj. 
/ˌtɛləˈpɑztɪv/ [after German Telepositiv (1897 or earlier)] Optics (a) n. a converging compound lens with a relatively long focus, esp. (in later use) one which serves as a component in a telephoto lens; (b) adj. designating a compound lens of this type; having the property of such a lens.Cf. tele-negative n. and adj.
Brit. /ˌtɛlᵻˈpɒzᵻtɪv/
, /ˌtɛlᵻˈpɒzᵻtɪv/U.S. /ˌtɛləˈpɑzədɪv/
, /ˌtɛləˈpɑzədɪv//ˌtɛləˈpɑztɪv/ΘΚΠ
society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [adjective] > types of lens
flat field1841
wide-angle1865
slow1867
wide-angled1873
fast1877
rapid1878
fish-eye1882
sharp1883
symmetrical1890
telephotographic1891
telephotographic lens1891
narrow-angle1893
stigmatic1896
tele-negative1898
tele-positive1898
bloomed1945
soft1945
wide-field1950
1898 Photogr. Ann. 241 Zeiss..recommends his single telepositive where rapidity and a large field are desiderata and slight distortion is of little moment.
1901 E. Marriage Elem. Telephotogr. ii. 15 The ‘tele-positive’ lens made by Messrs. Zeiss..is a single cemented lens made up of four parts.
1968 Official Gaz. U.S. Patent Office 18 June 782/2 The telephoto lens consists of a tele-positive in front and a tele-negative facing the film and separated by a large air space.
2011 N. English Choosing & using Dobsonian Telescope ix. 180 Al Nagler then had the presence of mind to insert an additional tele-positive element (also a doublet) that essentially reconfigures the light path.
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