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Consider the following:

The picture loses its quality if zoomed out far enough.

I found many instances of this on Google, but I dont see any subject in the if clause and I wonder if it's correct at all?

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There is no finite verb either; the participle zoomed acts as if it is an adjective. –  Henry Sep 17 '12 at 6:42
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2 Answers 2

In The picture loses its quality if zoomed out far enough there are two clauses. The first is the independent finite clause The picture loses its quality. The second is the dependent non-finite clause if zoomed out far enough. It’s another question whether a picture can be 'zoomed' or not, but that’s not a matter of grammar.

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This is likely in a review for a camera, and whether it's the it's [the picture] or [the camera] that has been elided in the second clause is arguable. –  Jim Sep 17 '12 at 7:22
    
Or it's just a picture which you are using a zoom tool on. –  nneonneo Sep 17 '12 at 7:36
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"If zoomed out" is grammatical and it's a phrase.

To be exact, it's a participial phrase.

When we make participial phrases from adverbial clauses, we can remove the subject but keep the subordinator:

The picture loses its quality if zoomed out far enough.

Or we can remove both:

Zoomed out far enough, the picture loses its quality.

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