250mm would still be 250mm whatever camera it's on
Why not do it the easy way - the standard focal length for the camera is about 100mm (90mm/110mm according to choice) so this is about 2.5 times larger. Hence, if you're after it in APS-C terms, about 70-80mm. I find it's always easier to calculate in terms of multiples of the standard focal length than convert from the format I'm using to a format I don't use and work back again.
If you want it, buy it. It's the same cost as a couple of nights out or a big dinner for two with a nice bottle of wine. Even with full import duty (4.2% on camera equipment) and VAT (at 20%) it's under £100* so looks to me to be a bargain. Treat yourself, it's your birthday after all.
* Approx. £120 including postage, possible maximum of £135-ish if you have to pay Parcel Farce for a service you didn't request and no other option was made available.** Can't say I'm not thorough about these things
** Yes, I'm still annoyed about that.
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