Mr.Utsumi made his first hand made telescope .He keeps his own web page Time is star
D 50 mm ( 2" ) Refractor
50 mm refractor

Objective lens : D = 50 mm f = 170 mm ( F = 3.4 ) achromatic lens

Eye piece : 3 lens in 2 groups ( better than kellner )

I set black piled seal inside of the tube .

main tube
Inside of the tube
small hole for eye piece and the plate to attach on the tripod can be seen .

That black piled sheet gives much better image than before .

I can get clear viewing even on daytime .

I also made ocular by myself using scraped lens from broken binocular .

original ocular

construction : Hood ,cell , objective lens , main tube  with the plate , ocular