-Roger Pitre- 1 X 7 binocular MN65, Nexstar 8SE, SV70ED, Lunt 60 PT EQ6 Pro, Vixen GP2, Canon 50D, Modified XSi, SBIG ST-2000XM, 70-200 f/4L, BackyardEOS "He's got shoulders on him like a smelt..."--Anonymous <a href="" target="_blank">https://www.facebook.com/pages/AJP-Observatory/462651307139970?ref=ts&fref=ts</a> http://ajpobservatory.is-great.org/
Ed "You have to grow old, you don't have to grow up."
“I am the only person to ever ace a 1951 USAF resolution test. My 'to observe' list says 'done'. I do not use charts or atlases when I starhop; men do not use maps. One of my sketches won an SBIG deep sky imaging contest. I am the life of star parties I have never attended. I never say anything looks like a faint fuzzy - not even a faint fuzzy. Pilots aim green laser pointers at me. Don Pensack proofreads my CN forum posts.” - The Most Interesting Astronomer in the Universe
70mm F/7 achro (my mama's gift for my 12 birth day) ARIES 7" F/8 Fluorite APO doublet refractor, ARIES 10" F/14.6 MCT (c.o. 22%) C14 with carbon tube, cooling fans + Hyperstar 3. PGR Flea 3, 1.3Mpix mono.
Quote:It could be that the 4" does not have its lens elements spaced optimally. I'd take it apart and play with the spacing to see if I could improve color correction for the 4-incher.
Quote:Does anybody know if this is true of the Explore scientific 127 F6.5?
Quote:My experience was very similar to Jim (Curry). After building my Carton 100mm f/13 and comparing itside by side with a Tak TSA-102 and a friends FS-102, I sold my TSA.The carton shows a tiny bit of C.A. on bright objects like Vega and Sirius, but it is the equal of the Tak scopes.With the planets, I was seeing exactly the same detail in all 3 scopes, ditto lunar and double stars,in fact the seeing of the F star in the Trap was easier with the Carton, and I have observed Sirius B three times now since the start of the New Year.I compared the Carton against several other ED scope and the Carton showed better contrast.The sale of my TSA has now funded the building of my Istar 150mm f/15 Achromat.
Kmart 40mm-Thanks Mom|Jason60mm-Thanks Dad|C80SS-Thanks Wife|C90|C102|C6XLT|AP130EDFGT|C-11XLT EQ-2|EQ-3|CG5GT|Mach 1 & Eagle "For once you have tasted flight, you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return".-Leonardo da Vinci "We're all in the gutter, but some of us are looking at the stars."-Oscar Wilde ~RIP Dad, you were my best friend...Godspeed!~
Quote:Hmmm, I wonder how many others have pushed the FS kool-aid away in favor of a quality achro?Jim
Quote:There are lots of different glasses all of which would fall into the "standard" type for an achro, crown and flint and not ED.
The better scope could simply be designed and uses a glass that is a bit more towards ED then the not so good one. Still achro but a better glass and so less CA.
Quote:There are lots of different glasses all of which would fall into the "standard" type for an achro, crown and flint and not ED.The better scope could simply be designed and uses a glass that is a bit more towards ED then the not so good one. Still achro but a better glass and so less CA.
.... back yard astronomer ================= Don't forget to look at the moon often. Its a play ground of fun if you throttle up the magnification!