C206 pilot reported a near midair collision while receiving radar services.

Attributes
ACN	1584751
Time
Date	201810
Local Time Of Day	1201-1800
Place
Locale Reference	EMT.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Cessna Stationair/Turbo Stationair 6
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	None
Person 1
Function	Pilot Flying
Qualification	Flight Crew Private Flight Crew Instrument
Experience	Flight Crew Last 90 Days 75 Flight Crew Total 4500 Flight Crew Type 3500
Events
Anomaly	ATC Issue All Types Conflict NMAC Deviation - Procedural Published Material / Policy Inflight Event / Encounter Weather / Turbulence
Miss Distance	Horizontal 50 Vertical 50

Narrative:

Flying west bound northwest of emt talking with [socal] was told to turn 20 degrees to the right for eastbound airplane. A minute later heard them tell the eastbound plane to descend 500 feet immediately. About 10 seconds later I saw him on my north side of my airplane just under my wing. Haze flying west bound was a factor. I do have ads-B and saw the initial conflict but was looking out for the plane after I turned 20 degrees to the right. The controller did not have the other plane turn to his right and I would have been out of the conflict if I continued not turning and going straight. I believe the controller was not on top of the situation and also for me not changing altitude.

Original NASA ASRS Text

Title: C206 pilot reported a NMAC while receiving radar services.

Narrative: Flying west bound northwest of EMT talking with [SoCal] was told to turn 20 degrees to the right for eastbound airplane. A minute later heard them tell the eastbound plane to descend 500 feet immediately. About 10 seconds later I saw him on my north side of my airplane just under my wing. Haze flying west bound was a factor. I do have ADS-B and saw the initial conflict but was looking out for the plane after I turned 20 degrees to the right. The controller did not have the other plane turn to his right and I would have been out of the conflict if I continued not turning and going straight. I believe the controller was not on top of the situation and also for me not changing altitude.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.