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Omega 340BP10 Excite FURA 20mm filter

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#1 Andy Perrin

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Posted 07 May 2019 - 20:04

I got a 340nm filter to play around with today, the Omega 340BP10 Excite FURA 20mm filter. Some pics below. Manufacturer supplied spectrum (dated just a few days ago, so probably of this exact filter):
Attached Image: Screen Shot 2019-05-07 at 3.48.49 PM.png

Out of camera RAW with no adjustments at all, the image looks like this (F/5.6 15" ISO125):
Attached Image: _DSC1486 EL-Nikkor 80mm Omega340BP10 F5.6 15%22 iso125.jpg

With white balance in camera off the sky, it looked like this (saturation and contrast also adjusted):
Attached Image: _DSC1486 EL-Nikkor 80mm Omega340BP10 F5.6 15%22 iso125 wb.jpg

I think I have a light leak somewhere, probably because I put the filter in rear-mounted with putty and I bet I missed a spot.

Edited by Andy Perrin, 07 May 2019 - 20:07.


#2 JMC

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Posted 07 May 2019 - 20:15

Looks good Andy. That browny, yellow, goldy, straight from the camera looks like what I see with my Sparticle board at 340nm.

#3 Cadmium

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Posted 07 May 2019 - 20:22

Very nice, probably the best use I have seen of a 340BP10.
I don't know if they make a graph of each filter they send out.

#4 dabateman

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Posted 08 May 2019 - 04:03

That looks very good. My 340bp10, has higher transmission, but also enough of an IR leak to cause issues in sunlight.
Using a compact fluorescent black light, it does have a very nice blue IR leak, that I like though. Adds to the image. The IR seems to be lower with those bulbs to be good for UV images with it. I have just gotten into the habit of stacking all my bandpass filters with either the 330WB80 improved filter or the Baader venus filter. The only bandpass filter I have that doesn't require stacking is the 390bp25.