BST Starguiders

[leo82]

Hi,

does anybody know whether these eyepieces are parfocal? I have the 8mm and like the overall quality of this brand. I'm thinking of getting a binoviewer and was thinking the less tinkering at the eyepiece would be more effective.

Thanks.

[Franklin]

Eyepieces of the same make, design and focal length are parfocal and should be exactly the same, provided they are from the same batch. So will work well in your bino's. The BST Starguiders, across the whole focal length range, are not parfocal with each other but are quite close. This wouldn't really matter for binoviewing as pairs of the same focal length will be ok together.

[leo82]

@Franklin Thanks for your reply and your explanation.