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The camera at the eyepiece
Pitfalls and opportunities In this article we want to show the different ways to enlarge the image or to take pictures through the eyepiece quickly and easily with a camera. These techniques are interesting for photographing the moon and planets as well as for anyone who wants to photograph through an eyepiece - for example, for nature photography through a spotting scope. "Getting closer" is the goal of many photographers. In other words, the longest possible focal length to image the objects as large as possible on the sensor. A practical rule of thumb for astronomers is that the sun and moon appear on the sensor approximately with a diameter of just under one centimeter per meter of focal length. Since long focal length telescopes quickly become very unwieldy or at least require a very heavy mount, it is difficult - especially as an amateur - to reach for the largest possible telescope. A 14" Schmidt-Cassegrain with 3900 mm focal length, as it can be found on many observatories, is for most people the longest focal length telescope, which they can access at least through a club membership. So how do you get closer? The answer is simple: a magnifying...
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The eyepiece series from Baader Planetarium
The eyepiece is half the optics - and every telescope is only as good as its weakest link. That is why Baader Planetarium not only offers high-quality star diagonal mirrors and prisms (which we present in this PDF), but also several series of eyepieces. Each has its own special features, which we would like to present to you briefly here. Besides, they are firmly integrated into the Baader accessories programme and offer interesting solutions for eyepiece projection and binocular observation. The series at a glance Classic Hyperion® Morpheus® Ortho/Plössl Aspheric Modular Zoom Focal length 6 / 10 / 18 / 32 31 / 36 5 / 8 / 10 / 13 / 17 / 21 / 24 8-24 (with Barlow 3,6-10,7) 4,5 / 6,5 / 9 / 12,5 / 14 / 17,5 Image field 50-52° 72° 68° 48-68° 76° Nosepiece 1,25" 1,25"+ 2" 1,25"+ 2" various threads1,25" + 2" 25" + 2" Camera connection – yes yes yes yes Planets +++ + ++ ++ +++ Widefield + +++ ++ ++ +++ Bino compatible yes yes yes yes yes Classic Ortho/Plössl The most favourable - or better, most inexpensive - eyepiece series are the Classic Ortho/Plössl eyepieces, which are...
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Barlow lenses, their magnification factors and working distances
Again and again the question arises whether a barlow provides the correct magnification at all. It is often overlooked that the magnification factor always depends on the correct working distance - you can read more about this in this PDF using the VIP Barlow as an example: Different Magnifications with the VIP-Barlow # 2406101 To settle this question once and for all, we took a few comparative shots on an ED80/600 telescope with a monochrome camera. Due to the seeing on a hot summer at an outside temperature of 30 °C, the shots of a neighbouring roof were somewhat unsteady, so that the sharpness of the individual frames is only of limited use for judging the quality of the Barlow lenses, but here we are only concerned with the scale of the image. On this occasion, the focus shift was also measured: A barlow moves the focus point and is often used to come into focus when there is not enough back focus. To do this, the actual barlow lens element is placed deeper in the focuser and the focus moves outwards. The reference shot: Fokal, without an additional barlow lens At first, a shot without an additional barlow...
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Additional Information
| General | |
|---|---|
| Manufacturer | Baader Planetarium |
| SKU (#) | 2954325 |
| EAN Code | 4047825101938 |
| Net weight (kg) | 0.14 |
| Specifications | |
| Focal Length | 25 mm |
| Apparent Field of View | 40° |
| Eye Relief (mm) | 15,5 mm |
| AR-Coating | Phantom Coating® Group |
| Speciality | Cross Aim |
| Eyepiece Design | |
| Field Stop Diameter | 18 mm |
| Number of Lens Elements | 3 |
| Number of Groups | 2 |
| Outer Diameter | 36 mm without illumination housing |
| Connections | |
| Inner Connection (lens sided) | Thread, T-2 (M42 x 0,75) |
| Threaded for filters | Yes |
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