نظام الكشف الصامت في الـ (SU-35) وهو (OLS) مجهز للمسح في دائرة كاملة بجانب كشف المقاتلات من مدايات بعيدة وعلى نطاق واسع في حين ان نظام الكشف الحراري (F-35) مجهز في الاصل للعمليات الارضية او القصف ويكشف المنطقة حول المقاتلة فقط وعلى الجانب الاخر نظام الكشف على (SU-35) مجهز بقوة لعمليات (جو/جو) و(F-35) محركها صاحب بصمة حرارية مرتفعة وفلة شمعة منورة وسيرصده ال(OLS) بمنتهى السهولة .......
There is a different approach to Infra-Red sensors. The JSF has a superb Electro-Optical Distributed Aperture System (DAS) designed to cover the sphere around the aircraft, but strongly optimised for air-to-ground operations. The Su-35S has a large aperture OLS-35 IRST optimised to scan for other aircraft at long range in its area of interest. DAS is a ‘staring array’ while the OLS-35 is a ‘scanning array’. The difference in detection range is like the difference between a person searching with a naked eye compared with another searching with a telescope. If the telescope is pointed in the right direction, it will get first detection. Add to that the factor that the JSF has the hottest engine in the market, and the IRST of the Su-35S is assessed as a superior aid to air combat