From t-kimura@asahi-spectra.co.jp Wed Oct 31 03:27:37 2007
Date: Wed, 31 Oct 2007 13:26:49 +0900
From: Toshihiko Kimura <t-kimura@asahi-spectra.co.jp>
To: Mihalis Mathioudakis <M.Mathioudakis@qub.ac.uk>
Cc: Vik Dhillon <Vik.Dhillon@sheffield.ac.uk>
Subject: Measured data(NBF 417nm / H-alpha)

Dear Dr.Mathioudakis,

I send you all of the actual transmission data.
Regarding the filter number, the label on individual package shows 
filter name and the number, "No.1" "No.2".

1)Specifications
> Narrow bandpass 417nm
> [CWL]
> 418.3nm +/-1nm in collimated beam
> => 417nm +/-1nm in ULTRACAM's f/2.3 converging beam
> [FWHM]
> 4.8nm +/-1nm in collimated beam

> H-alpha(narrow)
> [CWL]
> 658.8nm +/-1.3nm in collimated beam
> => 656.3nm +/-1.3nm in ULTRACAM's f/2.3 converging beam
> [FWHM]
> 4.9nm +/-1nm in collimated beam

2)Actual CWL
[Narrow bandpass 417nm]
No.1   CWL 418.2nm  FWHM 5.2nm in collimated beam
=> CWL 416.9nm in ULTRACAM's f/2.3 converging beam
No.2   CWL 418.2nm  FWHM 5.2nm in collimated beam
=> CWL 416.9nm in ULTRACAM's f/2.3 converging beam

[H-alpha(narrow)]
No.1   CWL 658.9nm  FWHM 5.4nm in collimated beam
=> CWL 656.4nm in ULTRACAM's f/2.3 converging beam
No.2   CWL 658.9nm  FWHM 5.4nm in collimated beam
=> CWL 656.4nm in ULTRACAM's f/2.3 converging beam

Both filters have quite ideal CWL. Perfect !
And peak transmittance are also good.

>  I believe that the $200 from the previous invoice has been cleared.

Unfortunately, it is not cleared at this moment.
I sent the invoice($200) to Jennifer McCabe(she is accountant ?) 
by airmail soon, when I was advised on 2 Oct. 
I am very sorry I make you troublesome, if it is possible, could you 
ask her about it ? Unless she received it, could you tell me her email
address or fax number ?

Finally, I appreciate you chose our company as the supplier.
When you need the other kind of filter in the future, please remember
Asahi Spectra.

Best regards,

Toshihiko

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