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Baader FR-4 - Parfocal Ring for 1.25" eyepieces and adapters

Name: Baader FR-4 - Parfocal Ring for 1.25" eyepieces and adapters
Brand: Baader .. Adapter
SKU: BA1905131
Price: 29 EUR
Rating: 5 (1 reviews)

The adjusting ring fixes the insertion depth in the focuser or in other receptacles and ensures a reproducible focus position.

FR-4: Stop ring 1.25" for sliding onto 1.25" eyepieces barrel

Precise adjustment ring with 1.25" inner diameter and two screws

To fix the insertion or the focal position of the off-Axis system and other guiding scope systems.

Effective length 4.8 mm

The last two images show examples for the practical use, the shown stop ring is an older model.

Manufacturer: Baader .. Adapter

Product number: BA1905131

EUR 29,00

incl. 19 % VAT (DE)

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excl. 6.95 € shipping costs (DE)

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rating: 5.0 of 5

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Baader FR-4 - Parfocal Ring for 1.25" eyepieces and adapters

The adjusting ring fixes the insertion depth in the focuser or in other receptacles and ensures a reproducible focus position.

FR-4: Stop ring 1.25" for sliding onto 1.25" eyepieces barrel

Precise adjustment ring with 1.25" inner diameter and two screws

To fix the insertion or the focal position of the off-Axis system and other guiding scope systems.

Effective length 4.8 mm

The last two images show examples for the practical use, the shown stop ring is an older model.

Details..
Technical data..
In the box..

Baader Parfocal Ring for 1.25" eyepieces and adapters

This parfocal ring slides easily onto the barrel of 1.25" eyepieces and is clamped with its two knurled screws. So it is very easy to get the same focus position repeatedly.

Usage for a calibration eyepiece:

Especially forastro photography, calibration eyepieces are used often. The eyepiece is put in place, focused and with the CCD camera, only fine focus controls are necessary. In order to have always the same focus position, the parfocal ring is necessary.

Useful accessory - see "Recommended accessories"

Extension tube with filter thread connection on both sides - this tube extends the 1.25" barrel of the eyepiece by 18 mm and thus improves the hold when the eyepiece has to be pulled out a little.

Internal connection:	Clamp, 1.25"
Inner diameter / clear aperture (mm):	31.75 (1.25")
Outer diameter (mm):	42.5
Screw type:	2x M4 clamping screws
Optical path (mm):	4.8 mm
Weight (kg):	0.02