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Meade Super Plossl Eyepiece

Telescope Eyepiece Magnification and Field of View Chart
 
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Telescope Eyepiece Magnification and Field of View Chart of
Meade Super Plossl Eyepiece
4mm 7mm 12.4mm 15mm 20mm 26mm 32mm 40mm
Meade ETX-60 ETX-70AT ETX-90EC ETX-125EC ETX-105EC telescopes

Meade Super Plossl Eyepiece is the most cost effective Meade eyepiece. Meade Super Plossl Eyepiece are good quality at reasonable price. I have an entire collection of Meade Super Plossl Eyepieces.

Magnification or power of the Telescope with a certain eyepiece can be calculated as the result of the focal length of the telescope divided by the focal length of the eyepiece.

M = Telescope focal length / Eyepiece Focal Length

Meade Super Plossl 26mm eyepiece on an ETX-90EC (1200mm) telescope gives you a 48X magnification. Meade Super Eyepiece 6.4mm eyepiece on the same telescope gives you 195X magnification. This does not mean you can have higher magnification by putting in shorter focal length eyepieces without limitation. The limitation is often the image gets darker and darker as the image gets bigger and bigger. Since the same amount of light collected by the telescope must spread over a larger image area, the image gets darker. Every time the image size is doubled, the light becomes 1/4 as bright. Very high power magnification is only sensible on very bright stars or planets like the moon.

There is a maximum magnification for any telescope beyond which the image would be too deteriated to count. The practical rule is 2 times the aperture in mm or 50 times the aperture in inches. Therefore the ETX-125EC has a maximum useable magnification of about 250X. the ETX-90EC about 180X. You have to have perfect observing condition to get to that kind of manigication.

Bigger image also mean the image will not be as sharp and depends on the quality of the telescope optics,

Meade Super Plossl 4mm 7mm 12.4mm 15mm 20mm 26mm 32mm 40mm Eyepiece for Meade ETX telescopes

Meade eyepiece Magnification and Field of View Chart

 

ETX-60/70 (600mm focal Length)

Focal Length

Magnification

Field of View

26 mm 13.5X 3.9
20 mm 17.5X 3.0
15 mm 23.4X 2.3
12.4 mm 28.3X 1.9
9.7 mm 36.1X 1.5
 
ETX-90 (1200mm Focal Length)
Focal Length Magnification Field of View

40 mm

31X

1.5

26 mm

48X

1.1

20 mm

63X

49

15 mm

83X

37

12.4 mm

101X

30'

9.7 mm

129X

24'

6.4 mm

195X

15'

 

ETX-125EC (1900mm Focal Length)

Focal Length

Magnification

Field of View

40 mm

48X

55

32 mm

59X

52

26 mm

73X

42

20 mm

95X

32

15 mm

127X

24

12.4 mm

153X

30'

9.7 mm

196X

15'

6.4 mm

297X

10'

 
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