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The cheapest achromat you can get. Use a 3-9x56mm rifle scope. TAke out the objective lens. And this one has approximately the same power as SGPro's achromat. The lens diameter=56mm. And the coating is nice too...

Why not use another Achromat as the GG condenser to get the ultimate quality? Achromat and PCX serves the same purpose. Why not use the achromat?

I found a way of making a very good low grain GG with perfect bokeh for vibration holder. But it is not easy to make and quite troublesome too. I found that EE-S screen is nearly perfect for adapter use. It is grainless, and for some miracle reasons it is almost 100% diffusive, high tech laser...

I used to use the Canon EE-S focusing screen as the ground glass. But it exhibit problems like weird bokeh and ghosting effect. But the lightloss and sharpness is fine. I'm planning to grind the ground glass myself. People said grinding the ground glass with 12micro Alumiumium Oxide can...