O dimineata de primavara in gradina

Observing with singlet refractor '' Telescopium Keplerianum '' D = 15 mm F/32 G = 9 x

Other Observations with Hind 158 mm Newtonian Reflector

Oculars ,from left :  HM (Huygens Modified ) 6 mm ,  Galilei - 50 mmm , 
Galilei - 9 mm , Baader Classic 6mm Ortho

36 Andromedae : 5.5 mv/ 6.5 mv / 1.1 '' separation 

Delta Geminorum : 3.5 mv / 8.5 mv / 5.5 ''

Theta Aurigae : 2.7 mv / 7.2 mv / 3.5 ''

Eta Orionis : 3.6 mv / 4.9 mv / 1.6 ''

7  Tauri : 6.6 mv / 6.86 mv /0.7 ''

Iota Casiopeiae : 4.63 mv / 6.92 mv / 9.05 mv / 2.9 '' / 8.9 ''

Beta Monocerotis : 4.62 mv / 5 mv / 5.39 mv / 5.32 mv / 7.1 '' / 3 "

''Hind'' Newtonian Telescope on 23-rd December 2015

This is the Newtonian telescope built by my friend Tavi aka Erwin  around mirrors made by David Hind from UK.
Specifications  : 
-primary mirror diameter = 158mm 
-primary mirror focus 1240mm
-secondary mirror m.a. = 32 mm
-DIY Dobsonian mount :all the parts ( except optics ) were 
made ,adapted ,adjusted and  assembled by Tavi.

Here we see Tavi at an outreach sponsored by ''Resita TV''  at Resita .

This action happened at the launch  of a TV documentary intitled ''On the footsteps of the first astronomers'' hosted by Marc Francu.

I'm having the honor and pleasure to use and test this telescope for a while.

Here follow some observations made by myself with the ''Hind'' 158mm Newtonian on 23-rd of December 2015.
I used deliberately Galilean oculars on the first test.
Their resolution and contrast on stellar objects is very good and  the sky background is very dark.
The Galilean  oculars are doing justice to the resolving power ,to the definition and penetration capabilities of the telescope.
However this type of ocular is very unfriendly and unforgiving to the user.
(So here is my advice ; ''don't do it at home'' unless you are a perfectionist freak! )
One was a Galilean ocular with a focal length of - 50mm sent by Carol , my colleague from ''60mmtelescopeclub''.
In order to reach the focus , I had to use my Japanese  2 x Barlow lens ,which in this case , become a 3x Barlow lens.
The magnification of this setup was 74 x.
The other ocular used on this test was a Galilean ocular with a focal length of - 9mm providing a magnification of   138 x .
The Galilean - 9 mm ocular is reaching focus.
This ocular was made by my friend Silviu aka zoth.

In a few words : excellent telescope ,very good optics , reliable   mount !

''The Celestial Passion'' by Richard Watson Gilder

https://archive.org/details/celestialpassion00gildiala

TELESCOPE MIRROR BLANKS -END OF YEAR STOCK TAKE

Work-In-Progress mirrors and mirror blanks at the end of 2015.
Upper row ,from left to right :
*143 mm x 11mm thickness,not grinded
*156mm x 14,7mm thkns,fine grinded up to #800 abrasive for F= 1240mm or F/7.9
*160mm x 16mm thkns ,fine grinded up to # 800 abrasive for F = 1200 mm or F /7.5
*317mm x 22 mm thkns ,fine grinded up to # 800 abrasive for F= 1360 mm or F/4.3
Middle row ,left to right :
*91mm x 11 mm thkns ,fine grinded up to #800 abrasive for
 F = 810 mm or F/ 8.9
*72mm x 7mm thkns , fine grinded for F= 690mm or F/ 9.6
*76mm x 14mm thkns ,cast , not grinded
Bottom row ,from left to right :
* 150mm x 18mm thkns , cast , no tool blank
*125mm x 15mm thkns ,fine grinded up to #800 abrasive for
F= 1440 mm or F/11.5
* 182 mm x 18 mm thkns ,rough grinded for F = 1650mm or
F/ 9.17

The 125mm cast blank and tool , fine grinded for a focus of 1440 mm or F / 11.5.

The 150 mm x 18 mm blank.

The pair of 143 mm x 11 mm blanks , untouched.

The 180 mm x 18mm thkns  blank , bought rough grinded for F= 1600 mm from Ioan Zaidel , a famous telescope maker of Romania befor and after   World War II.

The 317 mm x 22 mm mirror blank and tool , ready for polishing at F / 4.3.

The coumpund thickness of  of the 317 mm x 22 mm  mirror blank and 15 mm thkns tool.

Bird  view of  my biggest mirror blank.
Not rated as big by today's standard but not small, tough ...

The 160 mm blanks , the mirror blank is cast.

The 156 mm blanks , cut from a big float glass chunk  ,once part of the ''Ziridava'' show- window.