What is the most powerful reflecting telescope? What are space telescope mirrors made of? What does a refracting telescope look like? What is an achromatic refracting telescope? What is the largest reflecting telescope? What is the main optical element of a reflecting telescope?
What type of lens does a refracting telescope use? What does a refracting telescope look like? What is a crude refracting telescope? What is an achromatic refracting telescope? What are the primary reasons for making telescopes larger?
I bring it up because really with the eyepiece ridiculously high and flying all over the sky the German Equatorial mounted Newtonian is the obverse of the long achromatic refractor. Except it's heavier. It was tragic to have such a lovely telescope entombed in such an unusable body. I though...
The residual color error (tertiary spectrum) can be down to an order of magnitude less than that of an achromatic lens. Such telescopes contain elements of fluorite or special, extra-low dispersion (ED) glass in the objective and produce a very crisp image that is virtually free of chromatic...
My first telescope acquired 62 years ago is a40mm Dollond achromatmade in 1810. SeeAdventures with a 200 year old Dolond Achromat. I have another 50mm spyglass by "E. Vion, Paris France" that is about 100years old. Finally I have an AT115EDT which is an achromat + one lens (triplet...
achromatic range 色彩范围[translate] a2.Safety cap lock and opening will not loose such anomalies 2.Safety大写键和开头不会疏松这样反常现象[translate] abesides the blue eyes,blond hair is also the characteristic of Swedish people 除蓝眼睛以外,金发也是瑞典人民的特征[translate] ...
photographers who explore macro photography use these lenses for magnification to take close-up images that are free of chromatic distortions. This most common type of achromatic lens is called an achromatic doublet. Typically, the best quality achromatic doublet lenses feature low dispersion glass ma...
While many modern lens manufacturers employ specific techniques to reduce chromatic aberrations using achromatic/apochromatic optical designs and special extra-low dispersion elements, chromatic aberration is still an issue on most prime and zoom lenses that we just have to learn how to get around with...
My 12-inch SCT is an example. In my opinion, a good starting point is the 6 to 8 inch reflecting telescope or a 5 to 6 inch achromatic refracting telescope. Many of these are available from different venders. Browse the advertisements in any reputable amateur astronomy magazine or publicati...
Neural opponent interactions between cone outputs do not produce flicker-free visual signal. (A)Normalized output of the three real cones in adultMetriaclima zebrain response to light reflected off an achromatic target (50% reflectance) that was illuminated with flickering illumination. Cone output var...