Dirt often gets onto the focusing screen and you can see it in the viewfinder. Dirt on the mirror is not seen. But if the OP say it's a big blob then blowing the focusing screen should remove it or at least move it. If it doesn't move then it could be a rare case where it's inside the viewfinder on top of the focusing screen.
Thanks for your reply. I guess I made a mistake in terminology. It Must be the focusing screen I’m looking at. And yes Im a rarity because it is on top. I’ll call Nikon tech support.
I’ve had my Nikon D3400 for about 6 months. I noticed the other day a dirt speck and what might be a dust particle when looking through the viewfinder. I’ve determined that is is inside the viewfinder. Images are fine and I can look up through the prism and can see the particle. I tried blowing air around the prism but to no avail. Don’t know how it’s possible that anything can get inside there but it has. The large particle is right next to the center focus point. Very distracting.
Is there a way to clean it outside of sending it back to Nikon?
I love watching squirrels, but I know they can be quite the nuisance, especially when it comes to bird feeders. Good luck, but can you put out a little treat for the furry critters too?
Some years ago I did the same thing with a plastic pot. Worked for a while, then the critters started to chew away at the plastic and eventually ate their way to the feeder.
I thought of that and plan to wrap some hardware cloth inside the “bell” to prevent them from getting too far inside. At least this will keep me active in my old age
But I hope the war. Time will tell. First is a photo I posted previously lamenting on the difficulty of dealing with these critters. The second (Not a good shot, had to shoot through glass) is my solution attempt. I used an inverted planter box, cut a square hole in the bottom and attached with L brackets. They have spent the last 4 days trying to figure out a way to beat me, but so far...so good. I'll keep you posted. My birds are happy