Kit №III
The Eyepiece
PLÖSSL · 25 MM · 52° AFOV
TRUE-FIELD FRAMING
The small barrel that sets your magnification and true field — swap it, not the scope, to reframe the sky.
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- 1Eye lens
- 2Barrel
Instrument record
- Design
- Plössl (4-element)
- Focal length
- 25 mm
- Apparent field
- 52°
- Barrel
- 1.25 in
At the eyepiece
Magnification is just the scope’s focal length divided by the eyepiece’s, so a 25 mm in a 1200 mm scope gives 48× — and the eyepiece’s apparent field of view decides how much sky that frames. A long-focal-length, low-power eyepiece also yields the widest true field and the largest exit pupil, which is why you sweep a star cluster with one and reach for a short one only to split a double.
Standalone · in the kit
Built for one job — true-field framing — and it needs nothing else on the table to do it. Still, the whole kit works best in concert on a dark night.
Take it further
Read the deeper observing guides, size up gear in the field kit, or carry the notation as original merch in the shop.