Noaptea simpletelor

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 Dupa punerea in picioare a marii lunete de 26/2000mm menisc șlefuit nu brut am început sa intru in pielea astronomiilor simpletisti, iar in data de 26.04.2019 luneta de 2m a inceput un amplu program de observatii sistematice la duble.
In astfel de seri seci de primavara unde la momentul de fata nu avem nimic deosebit pe cer am observat mai multe duble incepand cu Castor la 76 si 100x, chiar fenomenala optica la 100x încă steaua este circulara cu un inel de difractie circular, discul airy rotund putin cromatism in partea de jos a stelei, iar la 76x zic eu ca imaginea se prezinta mult mai bine, Castor înfățișa o forma de 8 la ambele puteri fără o separare completa cu spațiu negru, chiar si fără un hair split, totuși Algieba o alta stea dubla se putea rezolva doar jumate din companion avand totusi o forma de 8 dar nu completa aici intervine si tipul lentilei, apertura mica etc.
Mizar o separare foarte buna a celor doua stele la 76x puterea cea mai des folosita care da rezultate mai bune decat 100x la Luna in special e ok totusi se vede diferenta intre o lentila biconvex simetrica si un menisc convergent fie el slefuit, stelele nu raman clare si perfecte odata ce depasesti pragul de 100x chiar si asa este de remarcat calitatea acestui simplet de a mentine o imagine buna la stele la asa putere, diferenta e ca la lentila biconvexa simetrica si la 200x stelele erau tot rotunde cu un disc airy rotund si multa aberatie dar asta e normal la asemenea instrumente.



Nu exista imagini mai pitorești decât cele prin lunete simplet sunt instrument durabile de nădejde având în ele multe ore de observații și sentimente adunate în timp.




Având in vedere ca in noptile de seara nu avem momentan nici o planeta cu astfel de instrumente te rezumi la duble in special la cele luminoase, totodată poziția inconfortabila la care se supune corpul uman când luneta e îndreptata în apropierea zenitului (caci nu ajunge chiar pana la zenit) în configurația actuala te pune direct pe jos culcat, un dezavantaj fiind noptiile cu vânt sau cu adiere de vant care pune în problema stabilitatea lunetei având în vedere ca este sustinuta doar de un singur punct de sprijin la lungimea asta orice adiere de vânt mai tare induce vibraje in tot sistemul mai ales dacă luneta este pusa pe o masa slaba cu picioare suptiri pe un teren denivelat, sau neavând stabilitate, asta poate induce probleme in seriile cu vant lucru care astronomii din sec al 17-lea erau perfect conștienți și le afectau observațiile.




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