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4hv.org :: Forums :: Electromagnetic Radiation
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UV sensitivity of a Nikon D70

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Physikfan
Thu Feb 22 2018, 01:53PM Print
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
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Posts: 304
The UV sensitivity of a Nikon D70 was measured by using a Hg spectrum. The camera was used without a camera lens in an open spectrometer configuration, consisting of a quartz lens, a reflection grating and a Hg high pressure lamp as a light source:

D70UVfullspectrumDSC 0082400x66

In addition to the visible 436 nm and 404 nm lines of the Hg spectrum, the UV 365 nm line of the Hg spectrum in red is clearly visible.
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Bjørn
Sun Feb 25 2018, 02:24PM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Is the IR blocking filter still in the camera?
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Physikfan
Sun Feb 25 2018, 03:23PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
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Posts: 304
I think so, this camera is not a modified one.
This red, wrong colour line is an UV line.
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Bjørn
Mon Feb 26 2018, 06:34AM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
It is fairly easy to remove the filter so could be worth the trouble if the camera is not in common use for other things.
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Physikfan
Wed Feb 28 2018, 01:41PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
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Posts: 304
The UV sensitivity of a modified Nikon D70 was measured:

NikonD70FS0K005s0080800x126

In addition to the 436 nm and 404 nm lines of the visible Hg spectrum, the 365 nm line of the Hg spectrum and two new UV lines in red (false colour) are clearly visible.
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Bjørn
Wed Feb 28 2018, 02:06PM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Excellent that is what I was hoping for.
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Physikfan
Wed Feb 28 2018, 02:37PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
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Posts: 304
The calculated spectrum from the picture above recorded by this modified Nikon D70:

NikonD70FS0K005s0080800x126D800x450


As you can see, these UV lines are at 365 nm, 334 nm and 313 nm.
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Physikfan
Thu Mar 01 2018, 08:02PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Here you can modify your Nikon D70 or do it yourself:

Link2
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