The Heliopan Bay 2 RG 645 Infrared Filter is designed to help capture images of how a subject reflects or transmits infrared light.

Infrared light waves occupy the space in the electromagnetic spectrum behind visible light due to their longer wavelengths. Many surfaces and materials react to, or emit infrared light waves differently than visible light waves, which provide the potential for photographs of subjects or subject properties that are otherwise invisible to the human eye. Such images require an infrared-sensitive medium such as infrared film or a digital photographic sensor which may be more effective when used without the infrared-blocking filters that are frequently built over them.

Conventional light sources such as the sun, photographic strobes, or incandescent lighting may be used to provide infrared illumination. However, because infrared films or digital photographic sensors can be more sensitive to the relatively higher energy and shorter-wavelength visible light those sources also emit, the effects of infrared light can be otherwise obscured. The Heliopan Bay 2 RG 645 Infrared Filter makes it possible to capture images of how subjects are illuminated by infrared light by blocking near-infrared, visible, and ultraviolet light waves while allowing 90% of infrared light waves 645nm or greater into the lens it is mounted onto.

This filter is constructed from Schott glass for increased optical clarity and features a brass filter ring for durability and jamming prevention.

For Infrared Images    90% of IR 645nm or Above Can Pass    Blocks Near-IR, Visible, and UV Light    ~8x Filter Factor, ~3 Stops    Schott Glass Construction    Multi-Coated    Bay 2 Front Filter Mount    Brass Filter Ring    Plastic Case

• Designed for use with infrared film or digital camera sensors by filtering out near-infrared, visible, and ultraviolet light
• Allows 90% of infrared light waves beginning at 645nm to pass through
• Effective for infrared films or other media sensitive to infrared wavelengths 645nm or above
• Constructed from Schott glass for optical clarity
• Each glass surface includes four layers of anti-reflection coating to prevent internal ghosting and reflections
• Filter factor of approximately 8x reduces exposure by about 3 stops
• Brass filter ring helps to prevent jamming and provides additional strength
• Bay 2 front mount allows use with other filters
• Plastic case for storage and transport

Related Questions and Answers

Q: 1. Is TB3 support Power delivery to MBP?

A: There is only 15W available, so in effect there is no power delivery.

Q: 2. Does this require Synology HDD's?? Or can I use a 3rd party like Iron Wolf?

A: You can fill this Synology DiskStation DS1823xs+ 8-Bay NAS Enclosure with Synology's drives, or other 3.5mm drives such as the Seagate IronWolf Pro, or WD Red Pro drives.

Q: 3. Does the SoftRAID software run on an iMac?

A: Yes, SoftRAID runs on a Mac. I've been using it since Apple stopped including raid in DiskUtility

Q: 4. Can I configure my 4 hard drives so that one (my fastest) can be identified independent from the other 3? And then set up the older 3 to function as a single JBOD? Thank you for considering.

A: Yes, you can have one drive as an independent disk, then, from your comments, the other three set up as a RAID 0 array.

Q: 5. Can I back up another NAS I already own (DS1621+) to this NAS from a different physical location?

A: Yes, as long as the Synology DiskStation DS224+ 2-Bay NAS Enclosure is loaded with enough drive capacity to cover everything in the NAS you already own, it could work as a backup in a different physical location.

Q: 6. I understand some users are having issues with the TB 3 connection dropping some drives randomly. (Note: similar problem existed with TB2 version and certain Macs, I experienced that myself). Has there been any resolution to those connectivity issues?

A: Peter,I had this problem extensively when I first bought the Thunderbay 4 enclosure. But I've since solved the problem. It now has happened only one time since then. Please bear with me while I explain how I fixed the problem. BTW no amount of searching the internet will help you. This took months of trouble shooting to figure out the solution.I have a new (2017) iMac Pro base model. I have the ThunderBay 4 enclosure and an OWC Thunderbolt 3 dock. The dock is used to add some much needed extra ports, most needed was the legacy Firewire 800 of which I have many FW800 external drives. There are two buses on the iMac Pro for the four (4) Thunderbolt ports on the back. The first two ports are on one bus, the last two are on the other bus. Being the neat freak that I am (and why I buy Apple products) I had both the TB4 enclosure and the TB3 dock connected to the last two thunderbolt ports, thus being on the same bus. You cannot do this (why, I don't know). You can check this by clicking on the About this Mac in the (black) Apple menu (top left corner) and then go to System Report. Go to Thunderbolt and you'll see Bus 1 and Bus 2, you'll see what I'm talking about.SOLUTION: You MUST have the TB4 enclosure and TB3 Dock each on it's own bus. So, connect one device to either the first two ports and the other device to one of the last two ports. Since then, I have only had a drive drop once (and that was when I had another external USB-C drive connected to the same bus as the TB4 enclosure).So I would guess this would be a problem on any Mac. Keep the TB4 Enclosure on its own bus and I'm guessing it's fine. So, at the end of the day, it's a GREAT enclosure. Compared to my other RAID drives, it's way quieter! Still some fan noise, but way more tolerable than my Sans Digital 2 bay RAID. The TB4 Enclosure sleeps and wakes with the iMac - Nice!. You do get the SoftRAID software, which is pretty nice. The only issue there is the drives do not show up in the Storage tab of the About this Mac window. So you have to do a Get Info on the drive from the Finder window to see how much storage is available on the drive.Lastly, if you do have an iMac Pro, be sure to contact tech support when you set up the drive. Apple has installed some unique security settings on the iMac Pro that need changed. OWC will be happy to walk you through the fix.Hope that helps.

Q: 7. How does a Windows user set up Raid 1? What software is used?

A: Setting up a RAID volume for Windows requires the use of the Disk Management application, as SoftRAID is Mac only at this time.

Q: 8. If a drive fails, can a user replace the drive and will it automatically bring it back in synch (assuming SoftRaid 5)?

A: Depending on the mechanism for RAID rebuild, yes, a user can replace the drive. Please be sure to consult the user guide/manual for the drive replacement and RAID rebuild procedure. Procedures can vary from RAID level used to manufacturer.

Q: 9. How much does it cost to How much does it cost to upgrade to "SoftRaid" software to do all RAID configurations?

A: SoftRAID Software would be included with this product.

Q: 10. My actual SR version is the 7, but I need to update to 8. How much free SoftRAID time do I get if I buy this unit?

A: The OWC ThunderBay 4 4-Bay Thunderbolt 3 RAID 5 Enclosure comes with a permanent version of SoftRAID.