Bahtinov mask

[shropshire lad]

I have a 150-600mm zoom lens on my Canon Dslr, my question is do I fit the mask on with the lens hood in place or just onto the end of the lens, or does it even matter??

 

[almcl]

I put the Bahtinov on the lens hood of my 200mm Canon lens and it works fine like that.  

[shropshire lad]

Thanks for your reply almcl , you must be close to me, I live half a mile from Madeley Court.

 

[almcl]

I'm just up the way in Stirchley. 

Not sure if it's going to clear tonight!