It can be done, Philippe, and my own E-450 has been done, although not by
me, and not by one of several commercial conversion services, but by a
DIY-er who replaced the hot mirror with a same-size piece of Schott RG780
glass which passes up to the 780nm wavelength.
His 'clean room' was almost but not quite clean, resulting in a couple of
dust spots on the sensor, behind the replaced hot mirror, and thus
impervious to the SSWF. Too bad, they never intrude on the image.
He also placed a small piece of 87 IR filter over the AF sensors to allow
the AF to work reliably for IR images (but makes the viewfinder look out of
focus!)
Have you seen Jens Birch's notes on a DIY E-1 conversion?
https://people.ifm.liu.se/jebir/box/bilder/IR/My%20IR-converted%20Olympus%20
E-1.pdf
I know of two UK commercial conversion specialists:
http://www.advancedcameraservices.co.uk/html/ir.html
http://www.protechrepairs.co.uk/infrared_conversion.html
And one supplier of ready-converted DSLRs (unfortunately, they all begin C)
who will also carry out conversions and sell the filter glass (but again,
for those C cameras):
http://www.dslrastromod.co.uk/order.html
Piers
-----Original Message-----
From: philippe.amard [mailto:philippe.amard@xxxxxx]
Sent: 05 September 2012 09:14
To: Olympus Camera Discussion
Subject: Re: [OM] An interesting avenue to take and play with
Thanks for the explanations Dawid - I'm sad as I would have converted my L1
to IR :-(
Amitiés
Philippe
Le 5 sept. 12 à 10:04, Dawid Loubser a écrit :
> Philippe, the way I understand it, the design of the lenses take into
> account the sensor cover glass. For example, when you buy any of the
> (too-amazing-to-even-contemplate) Rodenstock HR Digaron wide-angle
> lenses for medium format digital, they ship the lens with an extra
> rear "filter" that you have to screw on if you use the lens with film,
> to compensate for the fact that there is no sensor glass.
>
> I (and this is a guess...) imagine teeny tiny compact cameras with
> their teeny tiny lenses are even more sensitive to the presence or
> absence of this piece of glass in front of the capture medium.
>
> Dawid
>
> On Wed, 2012-09-05 at 00:11 +0200, philippe.amard wrote:
>> Le 5 sept. 12 à 00:02, John Hermanson a écrit :
>>
>>> You're being funny right?
>>>
>>> You can remove the IR filter but you have to replace it with an
>>> equal thickness of "regular" glass or whatever.
>>
>> What for?
>>
>> The only impediment I see is that the sensor will be bare, and
>> cleaning will be near ... impossible.
>> Else the more layers, the more distortion, reflection, usw you get.
>> You can't win on both sides, can you.
>>
>> Ph, who knows nothing about it all
>
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