Lenses for F5 telescope

[tms48]

I am looking to buy additional lenses for my Heritage 130p and have noticed that some lenses are advertised as for F6 and slower. Are there lenses that are better for faster telescopes or is this not critical.

[John]

Decent quality plossls and orthoscopics are fine for F/5 scopes. It's low cost widefield and ultrawide field eyepieces which show what's called astigmatism in fast scopes (F/7 - F/4). This means that stars become distorted in the outer portions of the field of view to varying degrees. This bothers some people more than others.