
These parfocal rings are a game-changer for astrophotography using different eyepieces .THEY keep the focus consistent and allow for quicker and easier swapping of eyepieces. The rings are durable and fit well on my eyepieces. The only downside is that they are a bit pricey for what they are but the convenience and quality make up for it. Overall, if you are really into astro-photography, these parfocal rings are a worthy investment..

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