RF 200-800 Lens Design Issue - Filter can't be used with hood

[MadJack70]

A friend of mine was lucky enough to have received her Canon RF 200-800mm lens that she had ordered in Nov. 2023.  She has encountered an issue with the lens design.   The new lens does not appear to allow use of a filter while the lens hood is in place.  She and her camera shop have tried a number of different brands of filters, but none appear to allow the lens hood to be mounted while a filter is attached.  This seems to be a rather inexcusable design flaw on Canon's part.  When Canon technical support was contacted, no one appeared to know anything about the issue.  With the exception of this problem, she loves her new lens.  Has anyone else encountered this issue with this lens?

[Tronhard]

Rick strikes again!!!  👋👋👋   

That makes total sense - Promaster is not a highly-respected brand: far from it.  A filter should not exceed the barrel width of the lens unless they are being adapted for square filters to be attached, or adapting non-threaded filters, such as the SX70HS series.

When you consider the SIZE of the thing, both in terms of diameter and thickness, it's massive!   My own filters, which are Hoya, Sirui and B+W are about 5mm deep (for UV0 and protect ones).  Even my CPL filters would be not as thick this as that.  Amazing...

In comparison, for example the Sirui Ultra Slim S-Pro Nano MC Clear Protective Filter (95mm) has the following characteristics:

Light transmission 99%  vs. Promaster 98.2%

Filter Type	UV / protect
Filter Factor	1x (0-Stop)
Circular Size	95 mm Filter Thread  the outside rim dia. @ 96mm does not exceed the diameter of the filter ring on the lens
Coatings	22 layers of anti-reflective, hydrophobic UV coatings
Physical Features	Slim
Filter Thickness	3.4 mm vs 8.2mm.
Filter Material	Schott B270 glass for increased optical clarity as well as colour fidelity
Ring Material	Aluminium

If one is going to invest a significant amount in a lens, it is not a good idea to get an inferior filter: - putting a rubbish filter on an expensive lens is like throwing away one's investment in quality.  Better filters to get would be the ones I listed,  even Kenko. Usually they are multi-coated optical quality such as Schott glass.  

[MadJack70]

Thanks so much for figuring out the cause of the problem for my friend.  As I mentioned previously, when my wife's RF 200-800 lens arrived, we had no problems with the hood while using B+W or Canon filters.  These were the only 2 brands I had on hand.   I have confirmed that my friend had a Promaster filter, but still do not know what other filters were tried at her Canon dealer.  Perhaps they were also cheap filters.

[shadowsports]

Greetings,

This was a cumulative effort and culmination of a great many minds.  I am fortunate and grateful to be amongst you.  😍 

[Tronhard]

Rick you are as gracious as you are knowledgeable, and in both you excel.