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John that looks like it could be the slightest bit of hair/dust but I'm not sure how to figure out exactly where it would be in the image train, I always start with cleaning my lenses with a good anti-static cloth (I buy them in packs of 500 from memory from AliExpress) and go right through.
I don't handle filters, I have a couple I don't really use much but they can be tricky depending on what they are made of.
Most of my gear I generally start with a blower bulb and good make up brush for stubborn dust, I still have an original Helena Rubinstein Make-up brush I was given by a company sales rep in the early 70s, it's camel hair and very fine and it has transferred through the years between camera bags. I also buy make up brush sets at Aldi when they are on special for my camera gear and my son has a set for his computer gear, soft brushes which don't scratch, used for removing hair and fluff (I have 5 cats, cat hair gets in places that would shock you, LOL). I DO NOT however use them on camera sensors, for that I spend the money on the foil sealed cleaners.
The little air bulb (blower) could resolve the issues, blow any dust off and see if it makes a difference. The general camera store things (and eBay) I find not great quality but my sons hearing aids came with a couple of amazing quality units that are great. Better quality units are worth the bit more cash if you want them to last.
NEVER use a compressor, there is always moisture even with a water trap. I also have an aldi inflation pump that's basically just a battery operated blower which sucks air in through a big fan on top and pressurises it out through a nozzle (mine uses the 20 Volt Aldi battery system same as a lot of my power tools from Aldi). I can use this to blow my telescope tubes out without introducing moisture but I put a fine mesh over the inlet to prevent it blowing dust out at my optics under pressure.
Canned air (refrigerant) is not good to use because it always introduces moisture content, maybe suitable for blowing out keyboards but even then I don't use it near computer or camera gear.
I do however drip the refrigerant out for varying projects and great on a burn (that's what canned compressed air is, refrigerant which gasses in above zero temperatures and pressurises as harmless gas (supposedly) in the can. Why didn't they ever do that with Freon?).
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