Docela mě zaujal David Gray a jeho pozorovaní Syrtis Major.
https://www.cloudynights.com/topic/7318 ... tis-major/A zvláště pak zkušenosti ohledně zvětšení a okulárů Meade 12mm HD-60. Tyhle okuláry, jsem si tenkrát sehnal v bazaru a kupil do bina jako první. Skvělé okuláry a to především s ohledem na cenu. Bohužel jsem do nich v binu nedal oči a musel je prodat.
Aubrey........Hellas I think it the wrong Martian season for that to be bright.....and possibly some aftermath of last apparition's dust storm. Come the colder seasons on Mars the basin is often filled with bright cloud. That many times has fooled the unwary into thinking it was the SPC......!!
On the Linked Post you asked........(pardon my oversight.blush.gif ...)
”635X on Mars is truly amazing. Can you tell us what eyepiece gives you that magnification, please?”
https://www.cloudyni...ion/?p=10527552 Those EPs are Meade 12mm HD-60s; these rival my old Zeiss Orthos, and of course I have a pair of the Meades for binoviewing. What I further like with those is they work well with the 0.5x focal reducers (Antares).
That combo giving 515x which I particularly like for double star work as against the reducers' pairing with all other EPs I have....for some reason the HD-60s have a great optical compatibility with those reducers. The only thing with those HDs is I’m not overly keen on those rubber eyecups.
It should be noted that all given magnifications in my posts are as determined by exit pupil measuring (Optical Micrometer - +/- 0.05mm) and the average of a good few measures is rounded to the nearest 5x.
Note that with the resultant 515x the reducers are giving nowhere near half of 635x; I reckon that is down to the spacing entailed by the barrel length of the HDs. Also always higher with my regular Meade 20mm 5000 Plossls where I get 385x and with reducers 285x (some image degrading/softening with those) again due to EP architecture I guess..........But it is all fine and productive..........
With the D-K’s f/16-f/18 (6640mm to >7000m fl) it is dependent on the position/secondary-distance of the primary to accommodate the Amici Prism, BinoVu, ADC etc. what the final magnification will be. Thus those 12mm HD-60s can range from 550x to 640x....so nice comfortably large EPs for high powers......but those H-D60 rubber eyecups I will have to modify/replace asap (I keep saying)......!