Vivitar +1 +2 +4 +10 Close-Up Macro Filter Set with Pouch (58mm)

I showed what 28cm looks like without a diopter, and it looks fine. If 25cm will be similar, likely looking okay, or just add a diopter, as you can get a set of 4 for ~$10. You can focus as close as 7cm if needed. This is what I used: https://www.amazon.com/Vivitar-Close-Up-Macro-Filter-Pouch/dp/B004DRCEDW