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1978 (1)
1974 (1)
1Author    Kuno KirschfeldRequires cookie*
 Title    The Absolute Sensitivity of Lens and Compound Eyes  
 Abstract    The numbers of light quanta available to photoreceptors of lens-and different types of com­ pound eyes are calculated on the basis of photometric considerations. It is shown that the results depend upon the situation in the optical environment: For point-like lightsources such as stars receptors in compound eyes generally receive considerably less numbers of light quanta compared n. g. with the human eye. This is due to the small sizes of the ommatidial facets. For extended optical surroundings, however, the numbers of quanta reaching the receptors in typical insect compound eyes of the apposition type are comparable to those in the human eye. In this respect the optical superposition eye of nocturnal insects like E ph estia is an exceptional case, where there is an improvement in the numbers of quanta reaching the receptors by a factor 100 to 1000 com­ pared to the eyes of bee or man. 
  Reference    (Z. Naturforsch. 29c, 592 [1974]; received July 10 1974) 
  Published    1974 
  Keywords    Lens Eyes, Compound Eyes, Absolute Sensitivity 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0592.pdf 
 Identifier    ZNC-1974-29c-0592 
 Volume    29 
2Author    R. C. Hardie, P. DuelliRequires cookie*
 Title    Properties of Single Cells in Posterior Lateral Eyes of Jumping Spiders  
 Abstract    Properties of single cells in the posterior lateral (PL) eyes of the jum ping spider Plexippus validus are described. Only one spectral class of cells was encountered and the spectra sensitivity was indistinguishable from that measured from the ERG , both peaking at ca. 535 nm. Angular sensi­ tivity (width of angular sensitivity function at the 50% level) averaged .89° ± .12°, the smallest value being .77°. Absolute sensitivity (reciprocal of the number of quanta of peak wavelength, on axis required to generate a 50% response) averaged 1.43 + 2 .5 X 1 0 -11 q _ 1 ,cm2,s. A ll cells studied were sensitive to the plane of polarised light. The per­ formance of receptors in the PL eyes is compared with that of receptors in the compound eyes of diurnal insects. It is concluded that the single lens eye system of spiders is in ­ herently superior in design to the insect compound eye. 
  Reference    Z. Naturforsch. 33c, 156—158 (1978); received November 8 1977 
  Published    1978 
  Keywords    Jumping Spiders, Receptors, Spectral Sensitivity, Angular Sensitivity, Absolute Sensitivity 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0156_n.pdf 
 Identifier    ZNC-1978-33c-0156_n 
 Volume    33