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Tony meade had a few variants of s4000 ep's in both plossl [50deg] swa [65-68] & uwa [80-82deg]
Wavy is right, you wont do much better, but the delos with newer coatings will make a small diff [exp obs will see it but some can't]
yours will be japan made ep's -they will still be good today, only place the newer coatings excel is faint DSO's -for lunar /planet there will be next to no diff
if you want to get something wider maybe the 20mm 100mm ES will fit the bill, bit cheaper than the ethos at close to the performance
you have the high mag end covered with your UWA's
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