香港天文论坛 http://www.hkastroforum.net/viewtopic.php?t=10276
测试者:香港镜王陈玉麟先生
Dear Telescope Enthusiasts,
After waiting for such a long time we finally get a clear night with stability good enough to test the new Maxivision 5 inch APO. Frankly speaking I just couldn’t belief my eyes.
The new Maxivision 5 inch apochromatic triplet telescope just performs so good than I cannot belief my eyes. It could easily be pushed up to 100X per inch and it gives a contrast, resolution and color correction, according to my memory, still better than that of the AstroPhysics 130 EDT.
Memory is not reliable. So we carried out an AB comparison test on the spot. Target was the lunar surface.
It happened that we just had a Thomas Back 7 inch Apochromatic Triplet telescope by the side and so we AB compared the performance of the TMB and Maxivision. In a magnification of about 300X ( TMB 7 inch f/8 used a Pentax XL 5.2 mm eyepiece, gives 275X. Maxivision 5 inch f/7.5 : used a TeleVue 2.5 X barlow + Takahashi LE 7.5 mm eyepiece gives 318 X ) Except that the TMB is much brighter everything we saw are identical in both telescopes, with the Maxivsion slightly at a higher contrast, and slightly at a less color aberration. We could hardly detect any advantages ( except more brightness ) in the Thomas Back comparing with the smaller Maxivision.
Thomas back is already regarded as the top performer in triplet apochromatic refractor. So is it high time for us to think twice before spending money on a Takahashi TOA 130, AstroPhysic EDT130 or a TMB 5 inch ? Since at 1/3 the price you get a same performance ( or even better ) Maxivision 5 inch APO.
I didn't say that Thomas Back is not good. Indeed Thomas Back performed excellently. But the fact is, the Maxivison is just too good.
Best regards
Chan Yuk Lun