26 replies to this topic

[25585]

Hi again,

 

 

I agree . . . I would "rephrase" your scope's description (OTA): as 12 inch (305mm) x 3,048mm FL (f/10) SCT OTA . . . 

 

 

This is also good advice: a Televue (or other brand) 55mm Plossl in 2 inch format (50mm - 56mm range) has about the lowest power, widest True Field of View (TFOV) in a 2 inch format, but many would call the eye relief (ER) very excessive and hard to find and keep eye placement. The Pentax XW 40mm would be easier to use and at 68 Deg AFoV might work better for you as a low-power-finder-eyepiece. Your plan to have a 2x Barlow might work well to get 20mm eyepiece equivalent, but would be "physically a long stackup" and might be unwieldly, but you might instead (at 20mm, WIDER AFoV) look into a WIDER AFoV, if that suits you instead . . . you may be happy with a 100+ Deg 21mm Ethos . . . but I'm not . . . 

 

There are less expensive eyepieces to consider in the 30mm to 56mm focal lengths, but I'm a real fan of the 40mm Pentax XW as your next step . . . just saying . . . 

 

Best,

 

Ed

TV 55mm Plossls have height adjustable eye relief, the same type as 41 Panoptics.

[eblanken]

Hi Richard (aka 25585) !!!

 

What you say about the Televue 55mm Plossls is true (in the newer "updated" design), but was not always the case (in the old ones like I "prefer")

 

Very Best Regards,

 

Ed