eye piece question from beginner

[malau (David)]

Hi all,

I have a reflector with the focal length 750mm. I would like to confirm the eyepiece with 5mm focal length and 3.8 still have a "huge" or at least significantly difference in terms of viewing and magnification? Thanks

[Steffen]

Yes, the difference in magnification (150x vs 200x) will be quite significant. Both sit towards the upper end of the magnification scale.

Cheers
Steffen.

[philipheaven (Philip)]

And if your using standard Plossl eyepieces with a 50 degree apparent field of view your true field of view in those eyepieces will be quite small.

The 5mm eyepiece will show a field of view of about 0.33 of a degree. The 3.8mm will show about 0.25 of a degree.