Vixen LVWs & Pentax XLs are my single figure FL, high magnification eyepieces. Barlowing is the other option. Its easier to choose & use longer FL scopes, & I've always thought scope FL choice as well as apertur
The source told me that Fuji will go for a “focal length below 100mm”. And now we can confirm that it will something between 60mm and 85mm (but more likely around 75-85mm). The lens should still be 1:1 Macro. But even if it comes from trusted source, take it with a ...
Studies in other bird species have found that song length is important during inter-sexual interactions, where females are more sexually aroused by, or prefer, longer songs (e.g. Wasserman and Cigliano 1991, Nolan and Hill 2004). Information on female sexual preferences for song attributes in ...
aWhen using an extension tube of same length, the image magnification ratio becomes smaller as the focal length of master lens becomes longer and the larger as the focal length becomes shorter. Also,the distance to the subject becomes further away as the focal length of master lens becomes lon...
Among localities the length of time this dyad was available before the breeding season varied from the whole non-breeding season to just a few days prior to laying in spring. I predicted that as the time available for assessment of the two options became longer the decision would result in ...
However, among the males that did not have their nest predated, the longer the time available for assessment of options, the more likely it was that a young male rather than an old one had selected the box in the new tree, whereas such an effect of age was not the case for males ...