hi,
after some tests done, thanks
@gse, the issue seems to be confirmed with my a119s.
I'll continue to do some more evaluation in order to be sure 100% but first result confirms what all of you are saying (and it's funny part to test and evaluate, personally I like it ;-) )
The operating temperature of the
@viofo a119s influences the focus?!
When the dashcam is cold, at least in my case, the focus is clear for objects at bigger distance, after 1h of operating and when the dashcam becomes worm, not so hot, the objects near the lens becomes clear and well focused, means distant objects become blurry and of course compared to what have been focused clearly when the lens was cold (really strange as the temperature range is not so big...crazy).
Now I am understanding better why I am disappointed by Viofo a119s.
It works good only for first 5 min...
and I've done the test under the ambient and constant temperature at my home (23°C).
So not a lot of temperature stress, from 23°C to the operating temperature of a119s only.
to be transparent I don't have the tool to measure inside of the viofo, but roughly the delta is of maybe 15°C, not more, when the a119s becomes worm.
Supposing that in the winter or summer it will be even worst, as the temperature delta range will be even less favorable to a119s = bigger dilatation; maybe not from -20 to +60 but the starting point could be easily from 0°C, so with the delta of 40°C the results will be interesting to see...or in summer, from 10°C in the underground garage to +50 on the windshield will give the similar "normal" 40°C temperature range.
personally I have some doubts that nobody at Viofo didn't test it...or maybe it's "normal" to this price range?
If my further test confirms this floating of the focus my a119s goes back to amazon, I still have 3 weeks to return it and 1* to Viofo, 5* to this forum
cheers
PS: which manufacturers have the robust lens and lens holder? only street guardian?
PSS : does someone know if Mini 0906 has this focus drift