Hi, I am trying to order some gratings from Edmund's Scientific for the Lhires3. I am not sure what to look for on their website. The gratings that I am...
I don't think Edmund have the right sizes for the Lhires III. Best to buy from Optometrics, the usual supplier (I believe Edmund also source gratings from...
4584
Stan Gorodenski
stanlep@...
May 2, 2008 1:22 am
One thing important is the blaze angle. I got my gratings from optometrics. I believe Shelyak gets the small diagonal mirrors from Edmund. Stab...
4585
François Cochard
francois.cochard@...
May 2, 2008 6:09 am
Hello Adam, I confirm that we buy the gratings from Optometrcis (this is also the Edmund's supplier). We use the "standard replicated ruled gratings" for 150...
... Are the ruled gratings better than holographic or is it just cost saving? ... Is it cost saving again? ... Do you just offer holders without gratings? I am...
4587
François Cochard
francois.cochard@...
May 2, 2008 8:25 am
Adam, Are the ruled gratings better than holographic or is it just cost saving? ... Dimensions... Is it cost saving again? ... Do you just offer holders...
Hi there, What's your experience with the replacing gratings on the grating cartridge. Is it difficult or time consuming? Is the grating attached with set...
Hi Adam, Although it is easy to change the grating on its holder, you risk to damage the grating each time you do it. It is safer to have a holder for each...
... Jose, The cost of 150,300,600,1200 gratings from Optometrics is 3 * 105 + 129 = $444. The cost of cartidges with gratings from www.astrovid.com is 4 * 535...
Hi all! I'm a new member of spectro-l list from L'aquila, near centre of Italy. Though I'm an amateur astronomer ever since I was a boy, I discover the...
4592
BM
bmauclaire@...
May 2, 2008 6:33 pm
On Fri, 2 May 2008 19:46:10 +0200 ... Hi Paolo, Very fine and precise work , and marvelous webpages! Great work! Some ohter adventures are possible as spectral...
Adam, < Framing a grating and sliding the framed grating into the cartridge would be a <cost saving enhancement to the Lhires. Yes, that would be a great...
est t'il possible de faire de la bonne spectro avec un mirroir sphérique ou pas en fait est ce que les résultats vont changer ou vont etre influencés et...
I have four gratings in four cartridges, three of them with the original ('pre-Shelyak') design which do make it possible to change the gratings ... but not...
... It reminds me of cheap HP printers and their expensive ink cartridges. That's how they make their money and apparently Shelyak figured out that too and...
Adam, I have the strong feeling you are a newcomer to the Lhires III scene and, as such, don't really appreciate the tremendous unpaid effort made by Francois...
I strongly support what Bernard just said. The decades of background R&D (browse thru Christian B's website to see) that have gone into producing this...
Adding to Eric 's, and my last posting, it is worth noting that a) The Lhires III is produced in small quantities in one of the most expensive manufacturing...
4600
François Cochard
francois.cochard@...
May 3, 2008 7:55 am
Hello all, Interesting discussion - but I'm afraid this is not really the right place to have it here (if you want, we can continue "off-line"). Of course, I...
4601
François Cochard
francois.cochard@...
May 3, 2008 8:30 am
(message en français plus bas) Hello all, 2 month ago, I sent a message to anouce that BeSS reached the level of 400 amateur spectra... Today, we reach 500 !!...
... What's the right place to discuss Lhires? ... Yes, cost. ... So it is screwed - right? ... Oh no! Now it is glued. Take Bernard's suggestion seriously. He...
Efficiency is priceless. If I need an instrument that I can manipulate and change even in the worse situations, in order to do not loose time, cost is the less...
To the members of the group who are having problems with the LHiresIII grating system costs. Please know that you have no idea the complexity of engineering,...
Just tell me the stars you need! I'll try to do my best for an organized effort for the coverage of the necessary Be stars. Righ now I'm trying to get the...
Hello, I am currently with the german VdS spectro team (excellent meeting - thanks to Ernst for organizing it!!!) and Anatoly Miroshnichenko made two excellent...
May be of some assistance in the future: I'm editting and preparing the BESS listings as an observing plan under AstroPlanner software. This will allow...
Paolo, Sr. Vitorio Lovato has built a spectrohelioscope for the sun in H alpha light. It is a telescope and a spectroscope end to end with an excellent solar...
Dear all, ... Since April 15th and until about September 15th, Corot is observing a field called LRC2. Unfortunately this field does not contain any known Be...
