You can check if the focussing screen sits tight / try what @shinkuu_kiss said with the tracing paper. I would also shoot a few frames with a different lens to see if it's this.
As mentioned already the streaks come from the lab, not you.
Cheers everyone - I thought the streaks came from the lab but wanted to double check before sending a complaint!
@Nef started
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You can check if the focussing screen sits tight / try what @shinkuu_kiss said with the tracing paper.
I would also shoot a few frames with a different lens to see if it's this.
As mentioned already the streaks come from the lab, not you.