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The selection of the proper telescopic eyepiece for a great telescope is
almost as fun as picking out the telescope in the first place and darn near as
expensive it seems. The difference that such an eyepiece can make is
dramatic...the difference between resolving the multiple bands on jupiter, the
Cassinni Division clearly and the festoons between cloud barriers, intead of
only making out the Red Spot and a couple of bands.
My intent is to make this table as complete as possible; however, I have generally chosen not to include economy eyepieces such as Super Modified Achromats (SMA) or eyepieces with 0.96" barrels. Your comments are welcome.
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Key to street prices: |
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A |
<$50 |
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B |
$ 50 -- $100 |
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C |
$101 -- $200 |
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D |
$201 -- $300 |
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E |
$301 -- $400 |
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F |
>$400 |
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Eyepiece |
Barrel |
Len. |
Dia. |
Wt. |
Design |
Parfocal |
Eye Relief |
Field Stop |
Apparent Field (degrees) |
# of Elements |
Street Price Range |
Source of Info, Notes |
Date of Info |
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Celestron |
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Celestron Plossl 6.3mm |
1.25" |
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Plossl |
Yes |
5mm |
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52 |
4 |
A |
Manuf. |
10/97 |
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Celestron Plossl 7.5mm |
1.25" |
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Plossl |
Yes |
5mm |
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52 |
4 |
A |
Manuf. |
10/97 |
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Celestron Plossl 10mm |
1.25" |
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Plossl |
Yes |
7mm |
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52 |
4 |
A |
Manuf. |
10/97 |
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Celestron Plossl 12.5mm |
1.25" |
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Plossl |
Yes |
8mm |
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52 |
4 |
A |
Manuf. |
10/97 |
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Celestron Plossl 17mm |
1.25" |
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Plossl |
Yes |
13mm |
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52 |
4 |
A |
Manuf. |
10/97 |
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Celestron Plossl 20mm |
1.25" |
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Plossl |
Yes |
20mm |
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50 |
4 |
A |
Manuf. |
10/97 |
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Celestron Plossl 26mm |
1.25" |
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Plossl |
Yes |
22mm |
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52 |
4 |
A |
Manuf. |
10/97 |
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Celestron Plossl 32mm |
1.25" |
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Plossl |
Yes |
22mm |
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46 |
4 |
A |
Manuf. |
10/97 |
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Celestron Plossl 40mm |
1.25" |
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Plossl |
Yes |
31mm |
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52 |
4 |
A |
Manuf. |
10/97 |
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Ultima 5mm |
1.25" |
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Hybrid |
Yes |
4mm |
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50 |
4-7 |
B |
Manuf. |
10/97 |
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Ultima 7.5mm |
1.25" |
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Hybrid |
Yes |
5mm |
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51 |
4-7 |
B |
Manuf. |
10/97 |
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Ultima 12.5mm |
1.25" |
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Hybrid |
Yes |
9mm |
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51 |
4-7 |
B |
Manuf. |
10/97 |
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Ultima 18mm |
1.25" |
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Hybrid |
Yes |
13mm |
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51 |
4-7 |
B |
Manuf. |
10/97 |
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Ultima 24mm |
1.25" |
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Hybrid |
Yes |
18mm |
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51 |
4-7 |
B |
Manuf. |
10/97 |
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Ultima 30mm |
1.25" |
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Hybrid |
Yes |
21mm |
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50 |
4-7 |
B |
Manuf. |
10/97 |
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Ultima 35mm |
1.25" |
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Hybrid |
No |
25mm |
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49 |
4-7 |
C |
Manuf. |
10/97 |
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Ultima 42mm |
1.25" |
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Hybrid |
No |
32mm |
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36 |
4-7 |
C |
Manuf. |
10/97 |
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Celestron Zoom 6.5-18mm |
1.25" |
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140g |
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No |
11mm |
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60.5-38.5 |
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C |
Manuf. |
10/97 |
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Celestron Micro Guide 12.5mm |
1.25" |
52mm |
33mm |
140g |
Ortho |
No |
11mm |
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C |
Note 1 |
10/97 |
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Eyepiece |
Barrel |
Len. |
Dia. |
Wt. |
Design |
Parfocal |
Eye Relief |
Field Stop |
Apparent Field (degrees) |
# of Elements |
Street Price Range |
Source of Info, Notes |
Date of Info |
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Clave (Kinoptik) |
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Clave Plossl 3mm |
1.25" |
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Plossl |
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2.7mm |
48 |
4 |
E |
Distrib. |
02/00 |
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Clave Plossl 4mm |
1.25" |
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Plossl |
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3.6mm |
48 |
4 |
E |
Distrib. |
02/00 |
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Clave Plossl 5mm |
1.25" |
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Plossl |
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4.4mm |
48 |
4 |
E |
Distrib. |
02/00 |
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Clave Plossl 6mm |
1.25" |
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Plossl |
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5.3mm |
48 |
4 |
E |
Distrib. |
02/00 |
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Clave Plossl 8mm |
1.25" |
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Plossl |
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7.1mm |
48 |
4 |
E |
Distrib. |
02/00 |
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Clave Plossl 10mm |
1.25" |
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Plossl |
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8.9mm |
48 |
4 |
E |
Distrib. |
02/00 |
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Clave Plossl 12mm |
1.25" |
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Plossl |
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10.7mm |
48 |
4 |
E |
Distrib. |
02/00 |
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Clave Plossl 16mm |
1.25" |
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Plossl |
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14.2mm |
48 |
4 |
D |
Distrib. |
02/00 |
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Clave Plossl 20mm |
1.25" |
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Plossl |
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17.8mm |
48 |
4 |
D |
Distrib. |
02/00 |
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Clave Plossl 25mm |
1.25" |
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Plossl |
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22.3mm |
48 |
4 |
D |
Distrib. |
02/00 |
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Clave Plossl 30mm |
1.25" |
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Plossl |
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26.8mm |
48 |
4 |
E |
Distrib. |
02/00 |
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Clave Plossl 35mm |
1.25" |
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Plossl |
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26.8mm |
42 |
4 |
E |
Distrib. |
02/00 |
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Eyepiece |
Barrel |
Len. |
Dia. |
Wt. |
Design |
Parfocal |
Eye Relief |
Field Stop |
Apparent Field (degrees) |
# of Elements |
Street Price Range |
Source of Info, Notes |
Date of Info |
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Collins Electro Optics |
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I 3 Piece 25mm |
1.25" |
4.5" |
2.9" |
468g |
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38mm |
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35 |
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F |
Manuf., Note 4 |
6/98 |
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Eyepiece |
Barrel |
Len. |
Dia. |
Wt. |
Design |
Parfocal |
Eye Relief |
Field Stop |
Apparent Field (degrees) |
# of Elements |
Street Price Range |
Source of Info, Notes |
Date of Info |
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Edmund Scientific |
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RKE 8mm |
1.25" |
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Kellner |
No |
8.2mm |
6.6mm |
45 |
3 |
A |
Manuf. |
10/97 |
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RKE 12mm |
1.25" |
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Kellner |
No |
10.7mm |
9.7mm |
45 |
3 |
A |
Manuf. |
10/97 |
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RKE 15mm |
1.25" |
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Kellner |
No |
13.4mm |
11.9mm |
45 |
3 |
A |
Manuf. |
10/97 |
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RKE 21mm |
1.25" |
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Kellner |
No |
18.8mm |
17.3mm |
45 |
3 |
A |
Manuf. |
10/97 |
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RKE 28mm |
1.25" |
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Kellner |
No |
24.5mm |
13.3mm |
45 |
3 |
A |
Manuf. |
10/97 |
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Eyepiece |
Barrel |
Len. |
Dia. |
Wt. |
Design |
Parfocal |
Eye Relief |
Field Stop |
Apparent Field (degrees) |
# of Elements |
Street Price Range |
Source of Info, Notes |
Date of Info |
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Meade Series 3000 |
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Meade Plossl 5mm |
1.25" |
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