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ED-2 9.5mm
Submitted: Wednesday, 14th September 2005 by John (asimov)
ed2_profile.jpg

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The ED-2 9.5mm

The ED-2 9.5mm eyepiece was tested in 2 scopes - my 12" f/5 newtonian giving 166x and my 6" acromatic refractor giving 126x.

The review will show a side-by-side comparison of how the eyepiece fared on a list of qualities in each scope.

 

Qualityf/5 newtonian reflectorf/8 achromatic refractor
On-axis sharpness This was very good to excellent on all subjects I found this to be good to excellent on Jupiter & stars
Off-axis sharpness It performed quite well, better than anticipated actually. Visually not much difference than F8 which was a bit of a shocker to me! I was expecting it to perform worse in this area at F5!  ( It pays not to predict!) Off-Axis it performed quite well. Good clean sharp focus. Slight anstigmatism on stars visible at the last 10% AFOV.
Contrast Dark back-ground on DSOs. Jupiters dark regions & the GRS more readily visible than some of my more up-market EPs. Did a great job in the contrast department. Fairly dark back-ground on DSOs. Jupiters dark regions & the GRS more readily visible than some of my more up-market EPs. Did a respectable job in the contrast department.
Field Flatness Focusing on an object On-Axis & letting it drift to the edge of the field, I found  some de-focusing was apparent. Better than some of my other EPs. I found this to be not overly bad. A fraction worse than at F8. Focusing on an object On-Axis & letting it drift to the edge of the field, I found a little de-focusing was apparent. Better than some of my other EPs. I found this to be not bad.
Light Transmission Same as F8 test. I compare this to a Vixen LV for light transmission. I found this to be ok. I could probably compare this to a Vixen LV for light transmission.
Chromatic Abberations I noticed nil amount of this As this test was conducted in an F8 achromatic refractor, I am not in a good position to judge in this area. Suffice to say it was no worse than any other eyepice I own. Using the aperture mask on jupiter, very little chromatic aberration was visible.
Eye-Relief and Comfort Slight kidney beaning. Takes all of 30 seconds to learn where to position your eye for optimal results. Not a problem for me. Since the F8 test I have learnt this EP has 20mm eye-relief. So it would be ok for glass wearers. I found the eye relief to be sufficient for me. IE: I did not have to roll the eye-cup back. If I had to guess, I would say it was between 10-15mm. If you wear glasses this EP may not be suitable, although rolling the cap back may be successful. This eyepiece does have a slight kidney bean problem. But I would say it was not overly annoying. Takes all of 30 seconds to learn where to position your eye for optimal results. I found out it has 20mm ER, making it ok for glass wearers
Ghosting I did notice when Jupiter was being viewed off-axis there was a "ghost of jupiter" directly on-axis. This was just discernible however, & did not really take away from the view. Some may find it off-putting , but I did not. No ghosting visible to my eye on bright stars. This is not visible to me at F8 Nil
Scatter Better than most of my up-market EPs on Jupiter Better than most of my up-market EPs on Jupiter
Field Stop Condition I saw no 'ring of colour' around the field stop. Nothing to report in this area.

I saw no 'ring of colour' around the field stop.

I also positioned the half moon just out of the FOV. The light grey colour in the FOV was evenly illuminated. I saw no long bright spikes of light spearing across the FOV as I see in some of my EPs.

Build Quality

Looks ok to me, Although at a quick glance you can tell it's not a $300 EP. The only thing that lets it down slightly is the cheap chrome job done on The barrel. It has a safety under-cut. It fits in the focuser slightly loose, with a deflection of approx .75mm when doing up the retaining screw. The 'blackening' job done on it is not up to standard. IE: The inner barrel thread where a filter might screw on is not black enough.

It looks to me to have the built-in barlow system. Somewhat similar to the LV in design. With the LVs you can take the barlow off.....With the ED-2....Just don't do it! You'll have elements flying all over the place if your not extremely careful. Not recommended.

Looks ok to me, Although at a quick glance you can tell it's not a $300 EP. The only thing that lets it down slightly is the cheap chrome job done on The barrel. It has a safety under-cut. It fits in the focuser slightly loose, with a deflection of approx .75mm when doing up the retaining screw. The 'blackening' job done on it is not up to standard. IE: The inner barrel thread where a filter might screw on is not black enough.

It looks to me to have the built-in barlow system. Somewhat similar to the LV in design. With the LVs you can take the barlow off.....With the ED-2....Just don't do it! You'll have elements flying all over the place if your not extremely careful. Not recommended.

 

Conclusion

The ED-2 kept up with some of my better eyepieces which incidentally, I paid 3X as much for on some of them. Not bad for $80 AUD.

I really like it in both the F5 and F8. It performed better than I was expecting, that's for sure.

Review by John (asimov). Discuss this review on the IceInSpace Forums.

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