Posted 11 September 2015 - 02:00 PM
Yes, I have a set of the HD 60 eyepieces and two sets of the 5000 series 5 and 6 element Plossles that the HD 60 eyepieces replaced.
For most things, the HD 60 eyepieces are what I am using with the LX 70 8 inch reflector I recently purchased.
The 5 and 6 element Plossles are good for longer f-ratio scopes. I use either those or my 4000 series Plossles on my long refractors. My 60mm by 700 mm focal length refractor really needs the 4000 series Plossles for weight reasons, even though I have used 5000 Plossles with it. The 5000 series Plossles have a 60 degree apparent field of view, like the HD 60 eyepieces, but have a little more trouble around the outside edges of the field. I have used and enjoyed them with my Polaris 130 f/5 scope, but I normally use them with a 90mm f/11 and a 100 mm f/8 refractors.
The advantage of the HD 60 eyepieces shows up with shorter focal ratio scopes, like your Polaris 130. With the four element Plossles, the cut off the edge of the field where it starts to get too weird. As the number of elements in the eyepieces increase, along with using different types of glass, they are able to control things on the edge better. The HD 60 eyepieces are a good example of that.
You will also notice as you go wider and wider with the view, and have a good image at whatever edge limit the eyepiece has, the price goes up. Light transmission is another factor as well as light scatter. Exactly what eyepiece type is best depends on a lot of factors, including the type and nature of the telescope, the type of objects to be observed, the light conditions, how much money someone can or is willing to spend, ....and on and on.
I still believe that a good set of four element Plossles is about as good as anyone really needs, but some of the others are nice.
There are some specialty eyepieces that can beat the HD 60 series for the particular type of viewing they have been designed for, but for one good set of general purpose viewing for most scopes, the HD 60 eyepieces are a good way to go....if you are in a position to spend the extra money for them.
They are too heavy for my small scopes, but for larger ones, starting with something like the Polaris 130, or Infinity 102, they work very well. They are all the same weight, so people using a Dobsonian telescope do not have to worry about a changing weight balance as one changes focal length.
Hope this helps,
Sky Hunters' Haven Observatory,
Broken Arrow, Oklahoma