Here is weight distribution on a large Hermagis, which covers a size more than 8x10!
lens cap (pill box type). 0.517 kg
barrel including hood. 1.904 kg this is more usual as there is an extra thread for a flange (Double-ender)
brass sleeve. 0.810 kg
lens cells with glass. 1.200 kg
This approaches5 kilos. The available petzvals are grossly over engineered. The early telescope makers made do with formed card and paper, and many survive to this day.
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