-DannyMy warehouseMy Channel
Meade LS8 ACF Meade 2" Diagonal Apetura 10" Tweakers Package Meade ETX-125, ETX-90 for Solar Celestron 80mm APO PST Meade SWA - 34mm,28mm,24mm,20mm Brandon 32mm, 16mm Vernonscope 40mm Erfle 2" ES 14mm,11mm,6.7mm 8.8 Nagler 13mm T6, Pan 19mm Meade 12.4 Pl,9.7mm, 15mm SP Meade 2x Shorty Barlow Powermate 2.5x WO Bino Viewer, 20mm 66* pair Denkmier 2 Super System Meade Nebula Filters Meade 9x60 Bino Vivitar S1 8x42 Bino Canon T2i, 18-55mm, 50mm 1.8, 55-250mm
"You're not afraid of the dark, are you?" - Riddick "The best scientists are humble. They seek to understand, not to ensure their legacy, but merely to understand." - Mori
Quote: Hi EddgieTo find the magnification of a barlow lens: Divide working distance of barlow lens with barlow lens focal length and add one.F/f+1 = xHere, F is 148mm, f is 90mm(148mm/90mm)+1 = x1.64 + 1 = x2.64x
C14 XLT, CGE NexSTAR 11 GPS + 120ST APM/TMB 130/780, AT111EDT SW EQ5P (2" Tripod/20" Pier) XW's 3.5mm - 20mm, 28mm RG, TVZ 2-4 ES14mm/20mm 100° UWAN 28mm,Paragon 40mm, TV55, Meade 2X 2" TeleXtender TMB SMC 4mm-16mm, Pentax 0-18, CZJ 0-25 EarthWin PFS-DBSE, WO DuraBright, AP MaxBright TV Bino's Bino Sets X 2: UO H.D's ~ 5mm-18mm, TV Pl.(NJ's)7.4mm - 40mm 16T5's, 24mm Pans Canon 18X50 IS Pentax 7X35 (9.3°
Quote: Thomas, I don't see a place within the equation to differentiate between different magnification factors?Is this formula strictly for a 2X Barlow and how would on calculate for a different Barlow?Does one add "+1.5" in place of "+1" to calculate a 2.5X and add a "+2" in place of "+1" for a 3X Barlow?
Quote: So in reality, an eyepiece with a Field Stop near the "working distance" would be closer to the native/true Barlow magnification as compared to a 5mm XO or TV Zoom that have the FS placed near the bottom of the eyepiece.