Third refractor to almost matching two same refractors
Posted: Wed Jan 04, 2023 10:38 pm
Hi all and happy new year,
For this year i will try to minimize my buying of gear but finalize or finish what is missing from last 2 years of purchased items, trying to have consistent gear for really long term and never looking back.
I have two TS-Optics 90mm CF triplets, i only used one the first one as i keep the second for later when i get a better mount or second mount anyway, and the one i am using/testing is showing really nice quality and i am happy, i didn't post examples around because i have some issues with my computers, but that didn't show the real quality of the scope really, so now i think i want to go far and add a third one to match those two inFOV mainly, if for quality too then a bonus, but i think it all depends on what i want to do, actually the third one can be used for certain data, so if i have say three telescopes and for example two OSC cameras and one mono then i can use one OSC for RGB and the mono for Lum and maybe Ha but i decided to use it for SII instead, so the third camera if i buy as OSC will be for dual band [Ha/OIII], now what do you recommend for that third telescope if it was you to decide?
1. 102mmf/ 7 achromatic or FPL-53 ED doublet (or FCD-1 triplet) + 0.6x reducer [stars will be removed] + IMX571C + dual band filter
2. Third 90mm, so it will be exactly same setup as two 90s i have, both are used with 0.8x reducers and IMX571 [M & C], here i will go with IMX571C can be used forRGB stars only
3. 110mmf/ 6 such as StellaMira doublet + Starizona APEX 0.65x + IMX571M + SII 3nm
4. 70mmf/ 5 Petzval + 294C, for stars only
5. 80mmf/ 4.4 6-elements + 294C, also for stars only
6. RedCat 51 or equivalent + 183 color, stars only
7. My Askar FRA400 + IMX571C stars only, or IMX571M with dual band forHa /OIII
I can make that 90mm + 0.8x = 432mm as mainFOV , or go with something little wider, i don't want to go longer, even 435mm-440mm i don't want, so it is almost the above options are what i could find, and they are almost affordable, less then $1500 or less than $1000, the soon budget will allow me to get one but without a camera, i even can use any above as individual alone such as 102mm or 110mm if necessary, but most likely i will do my best to put many many telescopes all at once for use per night rather than using only 1 or 2 per night, it never was good ending using 1 setup for me anyway, and i was testing two scopes together and i had few/minor issues i will fix later hopefully, so with another mount later i will try to use like 3-5 scopes at once if possible, i prefer to use mostly refractors of 80-120mm range, longer than that then i have my Newt/RC , smaller than that i already have two 60mm done or even Canon lenses, so i want to be at average 100mm aperture scopes more or less, i don't mind if achro or not good quality ED doublet so i can remove stars and use the ones from the CA corrected ones, that is why i want three scopes [or more] so i don't waste nights collecting data for each filter or band, i doubt i can spend many nights collecting data of each filter for one target only mostly if it is narrowbanding target or galaxies.
Thank you
For this year i will try to minimize my buying of gear but finalize or finish what is missing from last 2 years of purchased items, trying to have consistent gear for really long term and never looking back.
I have two TS-Optics 90mm CF triplets, i only used one the first one as i keep the second for later when i get a better mount or second mount anyway, and the one i am using/testing is showing really nice quality and i am happy, i didn't post examples around because i have some issues with my computers, but that didn't show the real quality of the scope really, so now i think i want to go far and add a third one to match those two in
1. 102mm
2. Third 90mm, so it will be exactly same setup as two 90s i have, both are used with 0.8x reducers and IMX571 [M & C], here i will go with IMX571C can be used for
3. 110mm
4. 70mm
5. 80mm
6. RedCat 51 or equivalent + 183 color, stars only
7. My Askar FRA400 + IMX571C stars only, or IMX571M with dual band for
I can make that 90mm + 0.8x = 432mm as main
Thank you