[ptsy]

好多人都話5D Mark II VF 容易入塵, 但 40D and 50D就冇此問題, why ? why ?

[Obi-Wan]

ptsy

NOT because of "因為鍾意喺雞蛋裏挑骨頭~~ "

scientific reasons (when compared to APS-C)
1. larger pentaprism
2. larger mirror which causes bigger & stronger wind due to mirror motion
3. bigger mirror box, larger surface area => more dust particle can stick inside the mirror box when u change lens OR when u zoom (some zoom lens, e.g. 100-400L 28-300 L like a "big air pump" to pump the dust particle into the mirror box

[Ref54]

=>好多人都話5D Mark II VF 容易入塵, 但 40D and 50D就冇此問題, why ? why ?
I have 5D2 and fortunately I don't have such problem at the moment.