None. As others have stated you can use any filter with an adapter. None of them, not even the Fuji one, will make it weatherproof. Weather resistant, yes, weatherproof no. It’s an important distinction.
You don’t say what focal length you had the lens set to. At 18mm with the cat about 1.5 m away at 6.4 your depth of field would be about 2 metres but at 55mm it will only be about 15 cm. Given the cat is at an angle to the focal plane I would imagine it is a depth of field issue related to focal...
I think the most likely cause here is what’s known as ‘seeing’ conditions which are movements in the atmosphere caused by heat mainly. Think of a similar effect to heat haze rising off tarmac on a hot day. To get a sharp shot of the moon with a single exposure on any given day is very lucky.
If...
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