The Heliopan Bay 1 Close-Up +1 Lens is a convex diopter designed to decrease the minimum focus distance of any lens in order to produce a shorter working distance for close-up photography. Available in varying strengths, close-up lenses also feature Bay 1 front filter threads for combining two or more filters to fine-tune results.

The front and rear surfaces of the filter both feature a single anti-reflection coating. Each coating helps to increase light transmission by reducing reflections, scattered light, and ghosting. Additionally, they offer protection to the filter substrate while helping to keep the glass clean for longer than uncoated glass.

This Heliopan filter is constructed from Schott glass for increased optical clarity and color fidelity. It features a brass filter ring for durability as well as jamming prevention.

Decreases Minimum Focus Distance    Convex Lens, +1 Diopter    Provides Shorter Working Distance    Bay 1mm Front Mount    Front and Rear Coating    Schott Glass Construction    Brass Filter Ring

Convex lens design and +1 dioptric strength lessens the minimum focusing distance of any lens for close-up shooting.

Single coatings on both the front and rear offer protection to the glass and help to improve light transmission and image quality.

Constructed from Schott glass for optical clarity.

Brass filter ring helps to prevent jamming and provides additional strength.

Dual mounts with Bay 1 front filter mount permits combining with other filters.

Related Questions and Answers

Q: 1. how do u check raid in this for bad sectors? i usually run apple disk utility and secure erase 2x on individ drives but what about RAIDS? i no see option for that on apple DUtility.

A: Apple Disk Utility should not be used with the OWC ThunderBay 4 4-Bay Thunderbolt 3 RAID Enclosure. You would need to use the free SoftRaid software to manage and maintain the unit.

Q: 2. is the SoftRaid software included? One reviewer says there's an extra cost to this to make it work with Raid 5.

A: This item was available in two versions One with and one without the RAID software. The one I bought had the software with it, and the price was $519.00. I love the unit. I have not yet set up a RAID in it, but drive installation was the easiest I've experienced anywhere. It was plug and play with the Mac. It is very fast and quiet. Hope this helps.OWC / Other World Computing OWTB4TB2EThunderBay 4 Hard Drive Enclosure (RAID 5 Edition) 1$519.00$519.00

Q: 3. I already have a ThunderBay 4 running on my MAC with Soft RAID license (v 6.1). I want to get one more of ThunderBay 4 (this unit) and use on the 'same' Mac. Do I need to buy another license of SoftRAID?

A: Different versions of SoftRAID have different rules for number of enclosures. You would need to check with the publisher for how many your version allows and if necessary a upgrade.

Q: 4. what is the warranty for this device (box AND drives)?

A: This product has a Limited 3-Year Warranty.

Q: 5. what type of drive is recommended for a longterm solution. Are the 2 bays meant to be setup as an array?

A: Enterprise grade drives are recommended for best results on the Synology DiskStation DS223j 2-Bay NAS Enclosure. The bays can be used as needed, either independently, or as an array.

Q: 6. can I connect 2 iMacs simultaneously?

A: This enclosure can only be connected to one computer at a time. If you need to connect more than one computer you would need a NAS solution.

Q: 7. Does this include Hyper Backup - Synology’s built-in backup utility so I can backup this NAS to Backblaze B2?

A: Yes, the Synology DiskStation DS224+ 2-Bay NAS Enclosure can run Synology's Hyper Backup.

Q: 8. For the new NVME storage pool feature, are 3rd party NVMEs supported?

A: Yes, you can use 3rd-party M.2 2280 NVMe SSDs in the Synology DiskStation DS1821+ 8-Bay NAS Enclosure.

Q: 9. In lieu of SoftRAID, can another software be loaded? Like TrueNAS for instance?

A: Yes, you can use another RAID software on this OWC ThunderBay 4 4-Bay Thunderbolt 3 RAID Enclosure.

Q: 10. Is it Mac compatible?

A: The Synology DiskStation DS223j 2-Bay NAS Enclosure (BH #SYDS223J), is compatible with MacOS.