EUR 39,00
Focal length: | 15 mm |
Design: | Super Plössl |
Field of view: | 52° apparant field of view |
Number of lenses: | 4 elements in 2 groups (2 elements in each one) |
Connection to the telescope side: | 1.25" barrel with filter thread |
Coating: | Fully multi-coated |
Eye cup: | yes - foldable |
Weight: | 72 g |
A comparison of the TS SP 6mm and other eyepieces - by an amateur astronomer I do not have very much experience yet, but I try a quick comparison: In this night the seeing conditions were excellent (1-2 on the usual scale). The telescope was a GSO Newtonian 200/800mm. The first eyepiece was the Antares 5.7mm W70. Already during a short earth observation I recognized its "nervous" viewing position. This was confirmed during plantary observation. Looking not exactly in the center of the eyepiece the border constantly came into the field of view. The fun of observation suffered noticeably. In addition the sharpness towards the edge was unsatisfactory. So away with it. Next came the BAADER Eudiascopic 5mm. The viewing was noticeably smoother. In addition the sharpness of the image nearly up to the edges and the brightness were very good. I could easily recognize the Cassini division in the rings of Saturn. The moons were pin-point. The eye relief is good (no crawling into the eyepiece is necessary). Finally I took the TS SP 6mm out of the the eyepiece case. Contrary to the first planet observations, with which I had been disappointed a little, the TS showed almost no weaknesses in this evening. The image of Saturn was absolutely clear before my eye. Cassini division and moon showed as recognizable with the BAADER. Image sharpness was almost as good as the Baader eyepiece. The viewing comfort is similarly good, only the eye has to get closer for viewing the entire field of view. In this evening I realized how important the seeing really is. As an unprejudiced beginner I had actually expected substantially larger differences between the eyepieces. If I had to make a ranking, the ANTARES would be the last by far. The BAADER maybe would have earned the first place in terms of quality, but regarding the large price difference I would prefer the TS SP. (My first thought about the eyepiece case was that it was a typical marketing gag. However, now I became aware how much money I saved with it.) By the way, the impressions described above were also confirmed by my 12 years old son.. Reinhold Scheibner - 8 March 2005 |
Transmission - A comparison between the TS Super Plössl and a TeleVue Panoptic: For observing faint objects the transmission of an eyepiece can be crucial. It can also be important to know how much light is transmitted in each wavelength, i.e. which parts of the spectrum pass the eyepiece almost unhindered and which parts are largely blocked. Inside each lens virtually no light is lost. The loss occurs in the transitions between air and glass, and the transmissions back from glass into air. To minimize this loss at the "glass-to-air-surfaces" an anti-reflective coating is used, but coatings can be very different in quality and effect. |
The spectral curve: The transmission should always be judged based on the spectral curve. For example a high transmission in the red part of the spectrum is almost no use during the night, because at night the human eye has only a very low sensitivity in the red part of the spectrum. By contrast, the green wavelengths are particularly important because this is where the eyes are most sensitive. .
This table demonstrates that a mere statement of the peak transmission without relation to the wavelength is virtually useless. An eyepiece might have an extremely good transmission in the red wavelengths, but in actual usage it might be very dim! |
TELE VUE Panoptic 15mm
Peak transmission 88%
TS Super Plössl 32mm
Peak transmission 98%. Very good transmission in the green part of the spectrum
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Reviews
Written by Angelika Wegner
on 2023-08-19
"alles ok"
Written by Eduard Saluz
on 2020-10-23
perfekt
Written by Wilfried Kehrer
on 2019-09-30
*****