Barlow is a must in every astronomer's accessory bag. I prefer to hold hands 2x, 2.5x and 3x, but not much higher than the others. You can get them at 4x or higher, but not at Celestron. You can also use them to get 6x magnification if you need it with a large eyepiece like 32mm or 52mm. They are durable and work well.
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