Looks that the topic is of no interest in any. So thanks for your response my friends.

Oliver, I also tried the part between Saiph and Rigel with the naked eye but definitely failed. But who know, perhaps it is possible under better transparency? When I calculate right, you got a field of around 1.5? with your 14-inch? Great catch to see the faint parts through that "narrow" field. Thanks for your try and your contribution.