Beiträge von franck griére

Sorry Wolfgang,
I was badly explained. optics that I would like tested will be a 400mm f/d5 roc 4000 and the spherical mirror will be one 203 mm roc 2535mm.
I want tested your system with the spherical mirror,and flat mirror, but at which distance to place the spherical mirror? zemax demo version can calculate this ?
http://www.astro-foren.de/attachment.php?attachmentid=522&stc=1&d=1227970345

and then to test the system of wainéo for compared.
astrotechnica.de/Archiv-Astro-…index.php?attachment/523/
203mm with 30 mm hole schould be ok whith 400 mm 4000 roc

Zitat von franck griére

hello Wolfgang,
I would like to test your system with a small variation, a flat mirror with 45°
http://www.astro-foren.de/attachment.php?attachmentid=520&stc=1&d=1227888984

I have a 203 mm / roc 2535 mm roc spherical mirror ( with 30 mm hole )

I d like to test whith a 410 mm f/d5, how you déterminate the lenses placement ?

Do you remember the null test from wainéo ?
http://www.astro-foren.de/attachment.php?attachmentid=521&stc=1&d=1227889325

hello Wolfgang,
I would like to test your system with a small variation, a flat mirror with 45°
http://www.astro-foren.de/attachment.php?attachmentid=520&stc=1&d=1227888984

hello Wolfgang,
can you making a simulation whith zemax for a miror of 600mmf/d3.5 please whit P . ceravolo lenses.

thanks

hallo Wolfgang
Orion Optics use suprax from schott for large diameter

Zitat

600mm (24 inch) f4 set Standard Grade 'Hilux' coatings
Produced from quality, 45mm thick, low expansion Suprax glass from Schott Germany. 1/4 PV wavefront specification giving excellent images for any choice of subject. Coated with 'Hilux' enhanced coatings for 97% reflectivity.
2400mm focal length

can you one day carry out a test on the strehl and the temperature on disc of this matérial ?

hallo,hello, bonsoir,

I seek experience feedbacks on the behavior of the mirrors large diameter in "suprax". Temperature setting compared to pyrex etc....
Did Wolfgang you test mirrors in "suprax"?

ich suche eine Erfahrungsrückkehr zum Verhalten der Spiegel großer Durchmesser in "suprax". Setzen in Temperatur hinsichtlich des Pyrexglases usw.....
Wolfgang As du getesteter von den Spiegeln in "suprax"?

Gruß

Hello,Wolfgang ,all mirror makers, all is in the title

Those which have already to cut mirrors cassegrain know how it is long and tedious to remove the center of the mirror, if there is not the trepan which dug it. I found this easy way to save time and precision

To beforehand bore the mirror before the end of roughing, to provide itself with wire of sins rather large, here 80 kgs of resistance

surround carrot of this wire in spiral, stick at the two ends

stop with synthetic plaster.

To finish roughing and grinding down until A with before last grain of carbo. Draw on the end from wire which exceeds with the back. Now, you can emerge the central hole easily!!!!:cool2:

Hallo Wolfgang , all

this is my new trilatéral dobson :

OK!! Thanks , Wolfgang

:whistling
sorry it s not the subject....

hallo Wolfgang,
so, in this case, how reduce the rolled edge phenomen?
Card pinhole can do this ?

Zitat von franck griére

:wub: :wub: :wub: :wub:

Hallo Wolfgang,
which interferometer did you use? the spherical fizeau or the bath?

hallo gert, wolfgang
Soeben ein kleiner Beitrag zu dieses post für zu sagen, daß ich diese Software auf den Räten von Wolfgang benutze, und ich bedauere es nicht!C' bin eine sehr ergonomische Software.

hello Wolfgang , all
Jean Guy morreau sent the original files to me to carry out the "null spherical test" at my lost hours I will try to carry out this assembly and to compare it with the results that have obtains it with a mirror of reference, and an interferometer. This test if it is conclusive can be very interesting for the tailors of mirrors amateurs which do not have the means of buying a mirror flat reference. I would hold here the result of my experiments. Herewith a interferogramme of a sphére of reference carried out by Mr. Jean marc becker.

it is all with their honor, but it is more expensive

however same with the test of Foucault and the mask to "couder" , the center is blocked?!The central part of the mirror is never used.

excuse me, I am explained, like you mentions above, with a zygo one can simulate the place of the small flat mirror in the telescope, it would be thus wise to be able to simulate its place thanks to the key "add obstruction" but that it is the software places this obstruction according to a parameter that one insert in the software.
One can oneself do it with "add obstruction" but they is less easy?!
fr.g

hallo Wolfgang
I have a suggestion to make for next the update, it would be interessant to be able to simulate the ocultation of the secondary, for example while entering its size, the software would center it automatically, it would be simpler than with the "add circle"?
What do you think about it?
franck