Takahashi Orthoscopic 4mm

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Brand and Model:Takahashi Orthoscopic 4mm
Price ($USD):$141.00
Focal Length:4 mm
Barrel Size:.96
Apparent FOV:40.0 degrees
Field Stop Dia.:0.0 mm
Eye Relief:6 mm
Weight (lbs):0.19

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Takahashi Orthoscopic 4mm
I agree with every word of the previous review. In my 4" APO
the image is sharp, contrasty and has very good light through-
put. The texture and detail of Saturn from my light-polluted
backyard was breathtaking.

The Hi-Ortho design is very comfortable, but if you must wear
glasses at the eyepiece you won't see the entire FOV. This is
now my favorite planetary eyepiece.

Overall Rating: 9
Optics:10 Value:8
Weight: 1 (Unreliable Vote)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=184330

Takahashi Orthoscopic 4mm
The best 4mm eyepiece I've used, period.

For critical planetary viewing this eyepiece gives excellent results, yielding high contrast, sharp images with above average light through-put. To combat the problem of eye-relief, usually such an issue with short focal length orthos, Takahashi add an extra element to this and the 2.8mm piece, which explains the Hi-ortho tag. Basically it acts like a barlow and makes this eyepiece comfortable to use for observers who don't need glasses. Performance seems otherwise unaffected and I appreciated the comfort greatly.

Clearly superior to the Radian at this focal length, with the Pentax orthos unavailable this seems the best premium option, unless a wider field or greater eye relief are essential. With a nod to the almost-as-good U Optics orthos I've deducted a point for value, but I won't be parting with mine in a hurry.

Overall Rating: 10
Optics:10 Value:9
Weight: 1 (Unreliable Vote)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=134776

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