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The SLV is essentially the same optic design as the NLV and original LV. What has changed over time is simply the housing design. Additionally, both the LV and NLV were both made in Japan whereas the SLV is made in China but QC'd in Japan.
I recently purchased an NLV and in terms of simple optical performance on Jupiter was extremely impressed with it. I have also compared the NLV with numerous other EPs (all at 5mm) at my disposal and would rank them as follows.
It should be noted that I found the Pentax to be the clear first/best but thereafter the difference between 2-4 were marginal (basically all almost as good as one another) and thereafter 5-7 werent as good but likewise almost as good as each other.
1) Pentax XW (A)
2) Vixen NLV (B)
3) Televue Zoom (B)
4) Televue Radian (B)
5) Televue Nagler (T6) (B/C)
6) Explore Scientific (C)
7) TMB planetary (C)
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