I don't know where to report such observations ,so if they don't belong here I'm asking Chuck to remove the post.
This is not a classic telescope ,it is more a reenactment telescope.
It is a Keplerian refractor made of singlet lenses like XVII Century telescopes.
The OG is a positive meniscus eyeglass lens of +0.3 D of 330mm focal length .
The ocular is a a crossed magnifier lens of 35 mm f.l. , providing a magnification of 9x.
The OG is stopped down to 15 mm according to specifications given by Huygens , Auzout , Martin or Thomas Dick.
The ocular is provided with field stop in front of the lens , toward the OG, and an eye relief guide 25 mm long , on the eye side.
The OTA is entirely home-made of carboard.
The tube is containing three baffles and is fully blackened with India ink.
The outside is ...what it is.
Thursday 28 of January I made observations with the tripod mounted ''Telescopium Keplerianum''.
In Collinder 70, the open star cluster including star Alnilam of Orion' s Belt , I counted 10 stars.
The stars belonging to Cr 70 are located to the West of Alnilam making an ''S'' shape.
In Collinder 69 ,the open star cluster including Lambda Ori star , I counted seven stars.Small but pretty!
In Collinder 65 , about half way toward Auriga , I counted 14 stars.
This is an open star cluster too wide for the Keplerian ocular,the stars are filling the whole visual field.
I don't wonder Cr 65 was not reported as a cluster by early astronomers (which include Messier and Herschel) due to small field oculars they used.
I knew previously and I searched the spot where Cr 65 lie and colu d be seen/
Otherwise I would miss yhis cluster !
In Collinder 39 I counted ten stars including Alpha Persei.
I counted only stars located to the East of Alpha Persei as the books say so !
In Pleiades I counted 22 stars ,this is the average of five countings.
Very nice vista ,the wide open cluster was well framed by the small refractor , with space to spare .
Hyades cannot be described by words , even for such a small singlet refractor it make a marvelous view.
But much wider tha the filed of Keplerian ocular.
The Double Cluster was well seen as two small hazy patches with one/orange here and two dim cluster stars visible there.
But the cherry on the top was the inner part of Orion : M43-M43 was much bigger and brigther than expected and Theta 2 and Struve 747 double stars were resolved into stars.
In the mean time , Jupiter rised above the roof of my neighbour.
The first look showed clearly a planetary disc but without any details.
Of the Galilean satellites , three were visible : two to the West -Ganymede and Callisto- and one to the East - Io.
I was baffled why I can't see the fourth satellite.
It was to close to the limb for my small refractor.
Such small refractors , and even smaller , were sold by Semitecolo by thousands.
The 15mm refractor is......really a very small refractor but , tripod mounted , is proving observational capabilities on par or better than a hand hold 10x 50mm binocular.
Owners of such instruments were able to do basic telescopic observations and enjoy a lot of fun!
Edited by ziridava, 31 January 2016 - 11:29 AM.