The Smena 8M has a Filter thread of 35.5mm. Unfortunately, we do not sell these filters in Lomography.com
Don’t you worry though; you can still find them on the Internet. Aside from these, you can also find filter adapters so you can use bigger sized filters on your Smena. Just go search for “35.5mm filter thread” using your favorite search engine.
We suggest you look for some photography shops that sell used cameras. Most of them have a filter bin with all the odd-sized filters that are rarely sold. Who knows, you might be able to find a “treasure” for a very good deal.