My Binoculars

Look | Basic Data | Visited Sky Objects | Conclusions | Links

On this page, I provide some information about my two binoculars, which I also use to observe sky objects. One of them is my fairly old Leica Trinovid 10 x 25 BC, and the latest are the TS 10 x 60 LE Porro binoculars.

Note: See also page Sky Objects Seen in Binoculars.

 

Look

A special feature of the Leica Trinovid is that you can push the eyepieces together if you use the binoculars with glasses. With the TS binoculars, you can fold back the rubber eyecups for this purpose.

 

Technical Data

  Leica Trinovid 10 x 25 BC TS 10 x 60 LE
Aperture 25 mm 60 mm
Magnification 10 x 10 x
Entry Pupil 25 mm n.a. (60 mm?)
Exit Pupil 2.5 mm 6 mm
Prism Type Roof prisms Porro prisms (BAK-4)
Coating n.a. Full broadband multicoating
Twilight Factor 15.8 24.5
Eye Relief n.a. 19.9 mm - retractable rubber eyeguard, fully suitable for spectacle wearers
Field of View 90 m for 1000 m / 5.2° true field of view 92 m for 1000 m / 5.3° true field of view
Focus Range 5 m to infinity 6 m to infinity
Weight 245 g (242 g including carrying strap*) 1200 g (1075 g including carrying strap*)
Dimensions 110 x 60 x 36 mm (L x W x H) 230 x 190 x 75 mm (L x W x H)
Rubber Armoring no yes
Tripod Adaptation no yes, optionally available (adapter)

*) own measurement

 

Visited Sky Objects

For details see page Sky Objects Seen in Binoculars, which also describes the sky objects.

DSO
Name Constellation Type
Binoculars

Leica Trinovid 10 x 25 BC

TS 10 x 60 LE
St 2 Muscle Man Cassiopeia OC yes yes
M 31 Andromeda Galaxy Andromeda G yes yes
NGC 884/869 Perseus Double Cluster Perseus OC yes yes
M 34   Perseus OS yes yes
Mel 20 Alpha Persei (= Mirfak) Cluster Perseus OC yes yes
M 13 Hercules Cluster Hercules GC yes yes
M 92   Hercules GC yes yes

M 39

  Cygnus OC yes yes
CR 399 Coat Hanger Vulpecula P yes yes
M 44 Praesepe/Crib Cancer OC yes ---
Mel 111 Coma Berenice Cluster Coma Berenice OC yes ---
M 45 Pleiades/Seven Sisters Taurus OC yes yes
Mel 25 Hyades Taurus OC yes yes
M 42/43 Orion Nebula Orion GNE yes yes
M 35   Gemini OC yes yes

G = galaxy, GNE = galactic emission nebula, OC = open star cluster, GC = globular star cluster, P = star pattern

 

Conclusions

Leica Trinovid 10 x 25 BC

I bought the Leica Trinovid in the early 1990s, because I wanted compact and powerful binoculars that I would gladly take with me on my trips. It did not disappoint me in this respect. Of course, I also used the binoculars for sky observations, well knowing that it is actually the exact opposite of a night glass, because until recently I had no other binoculars. The moon can be observed quite well with these binoculars, and in 2017, I was even able to see the Andromeda galaxy very nicely at the dark French night sky (in any case, better than ever before...). These binoculars are also well suited to observing larger open star clusters, although a magnification of 10 x is sometimes already too much, whereas for smaller open and globular clusters (and most galaxies) it may be too little.

TS 10 x 60 LE

I bought the TS 10 x 60 LE Porro binoculars in October 2017 (at Teleskop-Spezialisten), because, after the good experiences in September 2017 with a dark night sky in France, I wanted to explore whether a night glass can show even more objects than the Leica binoculars already do. So far, it is already evident that the view offers much more contrast with the TS than with the Trinovid. I also can see more faint stars, but there is not much difference with respect to discovering deep sky objects.

The TS binoculars are much heavier than the Leica Trinovid (though not as heavy as stated in the specifications). Due to the higher weight, I can keep it more steady than the Trinovid, but on the other hand, my arms also weaken much faster ...

Sometimes, I have problems with setting the glass correctly, especially setting the angle, and from time to time also with focusing. But these problems may be related to my eyes. The Trinovid is certainly less problematic here for me.

In daylight, The TS binoculars exhibit magenta and cyan colors at dark fringes (for example, if you view dark branches or a crow against the bright sky), which are more or less disturbing. At night, the color ribbons are unnoticeable and therefore not disturbing. I will have to check this again with the moon, but up to now, I experienced no problems with observing the moon.

 

Links

 

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13.12.2017