The manually focusable ZS lenses for M screw thread are equipped with a push pin in order to close the aperture. Furthermore, they are equipped with a locking switch to change from manual to automatic aperture control. Due to this, the lens can be comfortably stopped down to working aperture when used with an adapter. The aperture priority can be used as well. They do not include CPU coupling. Due to this, exposure metering and control is possible with all corresponding camera models.
Used with camera models without AI or fork coupling the aperture is closed to the pre-selected value, but metering and automatic aperture control is not possible. Immediately I took hold on the Telementor. Eyepieces H 34x and O 53x Brush for cleaning Guide for use Nice would be an eyepiece with shorter focal length maybe 8mm or 6mm focal length for higher magnifications The quality of manufacture There is a cliche: "made in germany".
Sometimes it is false, sometimes true. In that case it is real true! It does not clatter anything. The "zeiss-gray" tube with its internal focusing looks like new. It is not even an leight-weight thing, will be carried from the T-mount very well. The focusser is not a normal crayford or something like that. Rather it is a speciality: In the tube is a second one. This will during focussing in the "outer tube" moved.
With that expensive mechanism you get your sharp images. A very good idea from the design engineers in the old GDR! Missing at the "normal" Telementor is a finder-scope. Well, the Telementor is evidence of the exact opposite. For visual use at night, chromatic aberration is always well controlled.
But images through the Telementor show a lot of blue bloating, even with short exposures: worse than a Tele Vue Genesis, another well corrected achromat, for example.
The example below is just 30s, a short exposure at F13, but still shows a lot of violet bloat. In Use — The Night Sky. General Observing Notes. Zeiss Jena knew a thing or two. That focusing mechanism is odd, but it certainly protects the lens and it works well enough — with plenty of travel.
This one is a bit too stiff in places, though. Cool Down. Despite its weight, the Telementor cools fast like any small refractor and still offers decent views whilst doing it. Star Test. A bright white star like Rigel does give some purple in the star test. The Moon. One cold morning in late November, I woke to a slightly hazy sky but stable seeing. A day waning crescent Moon was high in the sky on the Meridian. Meanwhile, darkness was falling on Craters Plato, Tycho and Eratosthenes. A magnification of 93x with a 9mm Nagler easily embraced the whole Moon and gave a fantastic view — hard and full of contrast in shadowy crater and brilliant highlands, from limb to limb.
At that magnification there was almost no false colour except a thin rim of purple between bright rim and black space. Upping the power to x, the Telementor stayed just as sharp and the whole Moon still just fitted into the field of a 7mm Nagler.
A 5mm giving x was still sharp, but revealed a bit more false colour on the limb and no extra detail. I followed the terminator from north to south. East of the Terminator, Copernicus showed its twin central peaks and terraced walls.
Further south in the shadows of evening was Pitatus and beyond it Tycho, now a bottomless black hole with just the western rim dazzlingly lit. Right in the far south was Clavius, its arc of craters throwing long shadows. Beyond, on the very horn of the crescent, a single peak stood out surrounded by blackness. Nearby, rounded mountains rose from the very edge, the bright limb abutting black space, revealing the true shape of lunar mountains — something you only see with a quality optic.
All with a 60mm achromat! The Telementor, true to lore, makes a super Lunar scope. Some brief views of the planets — Saturn, Mars and Jupiter - in unfavourable i. When the planets return to higher altitudes in , I will the Fates willing, of course update this review with more planetary observations. Deep Sky. The Great Orion Nebula, M42, looks quite bright and with some nebular detail, a view typical of a good 60mm and not very different from my Takahashi FOA I particularly liked the view with the originally supplied Zeiss H at 24x: yes, it distorted the sword stars off axis the way a modern EP would not, but the nebulosity seemed a touch brighter and more structured.
0コメント