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Image Intensifiers Image intensifiers continue to evolve to higher forms and should be considered seriously by anyone looking to maximize deep space viewing. They also allow very satisfactory viewing from less than ideal locations, which are likely to be where we do most of our viewing, so their value cannot be overstressed. The controversy surrounding these amazing devices has still to die down, but suffice it to say, they are so remarkable, and the advancements recently made in them so significant that to ignore the topic would be performing a grave disservice. While this volume is not primarily concerned with their use, you should have at least the latest information so that you can make up your own mind about them. Perhaps needless to say, these devices are not for the more brilliant objects of the solar system; think of them primarily as deep space equipment. Recently Collins Electro Optics (the only company in the world offering specific image intensifier products to the astronomer) began marketing an even higher performance version of their original image intensifier eyepiece, utilizing what was previously referred to sometimes as a "Pinnacle" tube. These tubes are made by ITT and utilized in the I3 unit. Although they do have quite an edge on the competition, placing them at the top of the pack, it does not negate the value of other manufac-turers’ tubes. Do not despair if you cannot obtain a Collins I3 or ITT-based device! Other tubes by different manufacturers and with similar advanced designations of generation (Generation 4) are available in the USA and also overseas, and will prob-ably be more valuable than many Generation 3 versions. Thus, you should try to acquire the most advanced intensifier technology available to you, as every incre-mental degree of refinement does indeed make a difference. The slightly ingenious enthusiast may readily build an image intensifier eyepiece; the tube acts as the field lens, and a simple Plössl eyepiece may be attached to the other end to magnify and flatten the effect of the tiny concave phosphor screen.
The old Generation 3 system previously provided a boost of 2-3 times the aperture used. (I estimated that my 18-in. telescope had been performing with an equivalent light grasp of something approximating a 50-in. telescope.) The new intensifier eyepiece offers about twice the gain we had before. (Now, the same telescope is apparently performing with the light grasp of more akin to the Mount Wilson 100 in., and possibly even closer to the Mount Palomar 200 in.!) From home, that most elusive and distant globular, M54, was split wide open into stellar com-ponents, almost to the core! Not bad for an object usually described in appearance as merely "granular" around the edges through even the largest amateur scopes. The same night, the much increased light grasp was also very apparent for such old favorites as the edge-on galaxy NGC 5866, whose tiny dust belt and consid-erable mottling was exquisitely detailed, refined, and revealed.
Проблема в том, что его нельзя экспортировать из США... ну и цена
Почему это цена неоправданная?
Ну, так ЭОПы - устройства действительно очень древние . Давно применяются. ...