1. Does it really have only 30 mm clear aperture? Is it not too small for 2" eyepieces like Nagler 31 mm (42 mm fieldstop)? No vignetting?
2. What is the length of the light path in this diagonal?
3. I'm thinking about using this diagonal in a 80/400 refractor, with Teleskop-Service flattener TSFlat2 (http://www.teleskop-express.de/shop/product_info.php/info/p1010_TS-Optics-Universal-APO-Flattener-TSFLAT2-fuer-Refraktor-Teleskope.html), which has normal 2" filter thread. Can the nosepiece of the diagonal be unscrewed, and the flattener screwed to the body of the diagonal itself? (so the flattener would work as a nosepiece). In the description there is the information that "innenanschluss" is M48 thread, and this - I think - is equal to standard 2" filter thread...
Kind regards, Piotr Kierzkowski
The nosepiece on the telescope-side can be removed, the housing has got an M48-filterthread, too. Only the eyepiece clamp can't be removed.
Thanks, James Riall
The eyepiece clamp is not removable.
I'm sorry, but we can't publish CAD-drawings of the housings - there is too much "Cut&Paste-Copying" in the times of the internet.
Where do you draw the line ?
Is a good quality refractor 150 mm still ok to use with
the prism # 2456120 ?
Your advise appriciated Regards Fred Janssen
Standard Amici-prisms (like spotting scopes, too) are good for magnifications of up to ca. 60x-100x; of course this depends on the quality which you expect. This is the range of magnification suitable for terrestrial observations, where air turbulences usually prevent higher magnifications. Especially stars or bright planets in the center of the image show imperfections clearly.
The Astro-Amicis allow for much higher magnifcations - the magnifications which can be used astronomy.
This is not a problem of the telescope which you use, but of the optical design of the prism. There is an edge going through the middle of the prism which can cause reflections, and also both sides of the image need to be at the perfect angle. There is of course no strict limit for the magnification, but somewehere between 60x and 80x is a good limit for standard prisms.
#2956152 instead is a high-quality Amici prism and better that many prisms which are included in telescopes, but it is not made for highest magnifications.
90° mit 2" Okularaufnahme und 2" Steckhülse, inklusive Reduzierhülse 2" auf 1¼". Hervorragend geeignet für die terrestrische Beobachtung mit 2" Okularen. Nicht für hohe Vergrößerungen geeignet – für qualitativ hochwertige astronomische Bilder mit hoher Vergrößerung verwenden Sie besser unsere Spiegel und normale Prismen, oder das Amici-Dachkantprisma # 2456120, da die Dachkante den sog. "split" Effekt und der lange Lichtweg einen Farbfehler erzeugt
|Optical Design||Erecting Prism|
|Inner Connection (lens sided)||Thread, M48|
|Outer Connection (lens sided)||Barrel, 2" (50,8mm)|
|Inner Connection (eyepiece/-camera-sided)||Clamp, 1¼", 2" (50,8mm)|
|Reflection surface||Total reflection|
|Image Orientation||Erect image, Non-reversed|
|Optical length (mm)||99 mm with 2" barrel; with 1,25"-reducer additional 10 mm|
|Inner Diameter / Clear Aperture (mm)||38|