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Sure. The one caveat to this is that I don't have a uniform broadband light source. Not the end of the world, but near the UV things might get a little dicey.

When trying it on some black fabric I noticed a reduction of the magenta cast to a darker shade, but not quite back to black. My other UV/IR cut filters ( Leica, Heliopan, and B+W ) are all able to correct the color to black under the same setting.

NetMirror

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SHIPS TODAY: AeroDIODE offers fiber-coupled laser diodes at 635 nm and 660 nm as stock items or associated with a CW laser diode driver or pulsed laser diode driver. They are compatible with our high speed nanosecond pulsed drivers. The single mode laser diodes (Fabry–Pérot laser diode ) can reach high power in nanosecond pulse regime up to 50 mW. Most turn-key diode & driver solutions are optimized for single-shot to CW performances with pulse width lengths down to 1 ns. The laser diode precision pulses are generated internally by an on-board pulse generator, or on demand from an external TTL signal.

Hot mirrorfilter

"IR cut" and "hot mirror" seem to be used to mean the same thing -- decreasing IR that would get to the sensor. But there are many ways to do this, and saying one is "weaker" or "stronger" doesn't characterize the differences. If it is a dichroic (interference) filter, the filter characteristic (absorption percentage as a function of light wavelength) rises sharply from no absorption at visible wavelengths to near 100% absorption at some cutoff wavelength, but different filters cut off at slightly different wavelengths. If the filter relies on absorption by a dye, the rise in absorption will occur more gradually, over a wider range of wavelengths. In order to be effective in suppressing IR, this kind of filter has to suppress some nearby visible wavelengths, causing more of an overall green cast.

UVHot mirror

TOPTICA offers a large variety of wavelength-selected single-mode laser diodes. Among more standard laser diodes you will also find "rarities", i.e. diodes with output wavelengths that only TOPTICA provides. The diodes can be purchased separately. In addition TOPTICA can integrate any diode from the stock lists into a tunable diode laser system: Fabry–Perot or AR-coated laser diodes may be integrated into a diode laser systems, DFB/DBR laser diodes into a DFB pro and Tapered Amplifier into an TA system.

Thanks for the info. Your explanation makes sense - they could put it into the cement that bonds lens halves together. I'm pretty sure that those are plane surfaces.

i've got tiffen hot mirror filters left over from the days of the Nikon NC2000 DSLR digital news camera (its Canon counterpart was the DCS-3, I'm guessing that's where these are from) and I use them with step up rings on some of my lenses on my M8. The IR correction is not as strong as the current 486 and Leica IR cut filters, but it helps a little.

Hot mirroredmund optics

This article deals with lasers emitting in the red spectral region, i.e. with a wavelength roughly around 625–700 nm. The following types of red lasers are the most common:

If you are serious, I think a loan of samples could be arranged. I have Leica and B&W. Does anyone want to contribute Hoya or Tiffen specimens?

I could do that at work with one of our spectrometers. Might be interesting. However, since I don't have an M8, I don't have any IR cut filters... Haha.

Is it actually surprising that you find the best buyer's guide at the same place as the best photonics information source?

I think it's because of the formula. The Canon Hot Mirror filter is probably weaker than IR cut filters for Leica M8. Remember: Canon sensors have already an IR cut filter built-in!

Red fiber lasers were the earliest models developed for the cutting-edge microscopy platforms built in the laboratories of Dr. Stefan Hell, and flow cytometry platforms tested in the lab of Dr. William Telford of the Core Flow Cytometry Facility at N.I.H. where beam quality, reliability, and stability continue to be of the utmost importance.

Besthot mirror

HÜBNER Photonics offer red diode lasers and diode pumped lasers (DPLs) in the Cobolt 04-01, 05-01 and 06-01 Series. Also, we have the multi-line laser Cobolt Skyra.

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This might be a stupid question, but don't you think that it is possible for Leica to be incorporating the IR Cut into the coatings of the lens elements of all new lenses. That is to say that as from serial number xxxxxxx you no longer need the IR Cut Filter. This seems to make sense to me and reduces the number of air to glass surfaces, introduced by the filter, that can cause flare and reflections.

Thanks Artz. That's what I thought, too. But why is this Canon filter unable to correct the magenta cast like the others? Are there different grades of IR cut filters in terms of corrcting ability? Is there any way I can make it behave like the others?

Hot mirrorthorlabs

CNI offers red lasers with many wavelengths from 607 nm to 760 nm. Some of them are pure diode lasers, while others are diode-pumped solid-state lasers.

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Hot mirrorprice

I recently acquired a Canon hot mirror filter from the bay and the seller described it as "uv/ir cut" although the filter itself says "hot mirror".

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With wide Leica lenses (Tri-Elmar 16-18-21 in particular) you get better results with Leica brand IR filters than B+W... because of the formula. Even the 67mm Leica IR filter for the WATE has a different formula than other Leica IR filters.

Leica could, of course, make the first piece of glass plane and give it the interference coatings, but that would then require that people shooting film go through some kind of electronic manipulation to remove the cyan drift that the filtered lenses would produce.

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ColdMirror

Each type of diode is carefully tested in an external cavity laser configuration with respect to coarse tuning range, mode-hop-free tuning range and power limits. The results are disclosed on request to the customer in a detailed datasheet. In case you can still not match your wavelength of choice, contact TOPTICA – and chances are very high that we can provide it within very short time.

Serving North America, RPMC Lasers offers a wide range of red diode, DPSS, and gas lasers between 620nm and 699nm. We offer pulsed and CW lasers and modules, including single- and multi-emitter, free-space and fiber-coupled laser diodes, bars (arrays) and stacks, wavelength stabilized laser diodes, multi-wavelength, laser diode modules, HeNe lasers, CW DPSS lasers, line modules, and more, available with output powers ranging from 0.5 mW up to 5 W, with packaging at all levels of integration from TO can through turnkey system. Standard and custom options available. Let RPMC help you find the right laser today!

Thanks for the info. Your explanation makes sense - they could put it into the cement that bonds lens halves together. I'm pretty sure that those are plane surfaces.

Light from lasers operating at somewhat longer wavelengths, such as 750 or even 800 nm, can still be perceived as red light, if it is sufficiently intense. (There is no sharp boundary between the visible and the infrared spectral regions.) It can, however, be hazardous to view such light because such intensity levels required for good visibility can damage the retina.

Red lasers are applied e.g. as laser pointers, for bar scanners and other laser scanners, for optical data recording or retrieval (e.g. on DVDs), for laser projection displays, for interferometers, for pumping of certain solid-state lasers (e.g. Cr:LiSAF or Cr:LiCAF), and in medical therapies (e.g. photodynamic therapy).

Subsequent DSLR camera was the Kodak DCS520/Canon D2000 which had a built in IR cut filter behind the lens, so these filters would have not been necessary.

Leica/Kodak chose the latter kind of filter as the cover glass for the sensor in the M8, perhaps to avoid internal reflections. In specifying the dichroic filters that go in front of the lens, they eventually settled on a formulation that cuts off slightly deeper into the IR than the B&W 486. When this was a hot forum topic, one poster proposed to get out a spectrophotometer and actually measure the characteristics of the different filters available for suppressing IR, from Schneider (B&W), Hoya and Tiffen, but I never saw the final results of that very interesting piece of research. Since the effect in images depends strongly on the character of the light, it's hard to judge from anecdotal examples.

Wavelengths from 620 nm to 775 nm are available in either an OEM compact package, and/or a 2RU rack mountable package with integrated power supply and are equipped with a user-friendly graphical user interface for ease of setup and operation. MPB offers an optional fiber coupling service which provides the user up to 1 watt out of the fiber.

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