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Tele Vue Bandmate

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#1 Mr Dobson

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Posted 25 September 2020 - 08:25 PM

Quick question. I just bought/received a new Tele Vue (Astronomik) Bandmate H-Beta. It did not include a filter test sheet. Does Tele Vue not provide them?

#2 jupiter122

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Posted 25 September 2020 - 09:31 PM

You might call or email David or Paul at Televue and ask for the test sheet. Televue’s website says the filters are made by Astronomik so you might try them also.

Good luck.

Tim
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#3 jupiter122

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Posted 25 September 2020 - 09:51 PM

Mr Dobson, is this what you are looking for?

http://www.televue.c...id=24&Tab=_spec

#4 CrazyPanda

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Posted 25 September 2020 - 09:51 PM

Quick question. I just bought/received a new Tele Vue (Astronomik) Bandmate H-Beta. It did not include a filter test sheet. Does Tele Vue not provide them?

I don't recall if I got one with my O-III and Nebustar, but it seems they print at least the max transmission values on a label on the filter case itself. No FWHM bandwidth values though (sadly)


Edited by CrazyPanda, 25 September 2020 - 09:57 PM.


#5 Mr Dobson

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Posted 26 September 2020 - 05:23 AM

Mr Dobson, is this what you are looking for?

http://www.televue.c...id=24&Tab=_spec



#6 Mr Dobson

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Posted 26 September 2020 - 05:23 AM

That's it. Thank you.
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#7 jupiter122

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Posted 26 September 2020 - 06:56 AM

Great. Happy to help.

Clear skies!

Tim

#8 LDW47

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Posted 26 September 2020 - 09:53 AM

I don’t recall if one came with mine, if it did I threw it out / ignored it ! All I wanted to do is look through it, I trust them. But as I think about it one did come with mine, all neatly folded up, I opened it to have a look and on the next garbage collection day guess what, lol ! I like to be an observer not a reader of superfluous data ! 


Edited by LDW47, 26 September 2020 - 12:24 PM.


#9 Starman1

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Posted 26 September 2020 - 06:22 PM

Quick question. I just bought/received a new Tele Vue (Astronomik) Bandmate H-Beta. It did not include a filter test sheet. Does Tele Vue not provide them?

Sad to say, and it is not certain, but it appears no one provides a test sheet for the actual filter sample any more, just a "generic curve" for one sample in the batch.

On the back of the TV BM-II H-ß box is a peak transmission figure for the transmission curve and the shortest f/ratio that does not move the bandwidth away from the spectral lines.

 

Here is a site where a lot of filters were tested:

https://searchlight....d-153d7e7c0eb8#

You can select or deselect any filter on the upper right of the page.

Don't pay attention to the TeleVue BandMate filters, only the BandMate II (the ones from Astronomik)

The CN poster LunarFox (Oggie Golub) was testing filters for people for free but that was back before the plague.

I don't know if he is still doing it.

 

FWIW, my TeleVue BandMate II H-ß had the following specs:

transmission at 486.1nm--97.6%

FWHM bandwidth--10nm

top and bottom wavelengths for the FWHM curve: 481nm, 491nm

out of bandwidth transmission:

495.9nm (O-III)--4.7%

500.7nm (O-III)--1.2%

656nm (H-α)--0%




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