How to tell the difference between FS Twinsonic lenses and Code 3 SD lenses

[JennyCop]

How to tell the difference between FS Twinsonic lenses and Code 3 SD lenses, its easy! They look extremely similar but are each quite different. The SD domes have two lips and the twinsonics only have one lip on the outter side. I have seen code 3 SD domes modified (mutilated) to fit Twinsonics.

 

[ERIC6913]

very informative Jenny!

 

[jph2]

:iagree:

 

[JennyCop]

Thanks Guys! I have just been asked this question a few times so I figured it was time to educate!

 

[ex416]

the pictures are very helpful in showing the difference in the lenses. that's why they say a picture is worth a thousand words. good job :thumbsup:

 

[Squad-6]

Good timing, I was asked this not too long ago and didn't know what to say.

 

[EHFD_Tower_751]

if i also remember right, the SD domes have more of a curvature on the domes, than the twinsonic domes (or maybe it was the other way around)

 

[stansdds]

SD domes have just a tiny bit more curvature to their vertical surfaces than TwinSonic domes. It's not much, I measured and the top of an SD dome (measured front to back) and it is 6.9", the TwinSonic dome is 7.0".

 

[LRGJr72]

Any theories on why the SD domes appear so similar to TwinSonic domes? Maybe Code 3 was trying to ride the popularity coat-tail of the TS. Maybe they intended for them to be interchangeable... but that's nixed by the slight variations listed above.

 

[stansdds]

I'm thinking they wanted to ride the popularity of the TwinSonic. I expect that is also the reason why Dietz, Signal Stat, and SVP had teardrop shaped beacons that were very similar to Federal's Fireball. Just guessing here.

 

[JennyCop]

I'm thinking they wanted to ride the popularity of the TwinSonic. I expect that is also the reason why Dietz, Signal Stat, and SVP had teardrop shaped beacons that were very similar to Federal's Fireball. Just guessing here.

You are correct!