Dersom bevegelsesuskarpheten øker, bruker vi stativet.

Yes. Dersom and hvis both mean if.

The main difference is style:

• dersom = a bit more formal, written, or careful
• hvis = very common in everyday speech and writing

So:

• Dersom bevegelsesuskarpheten øker ...
• Hvis bevegelsesuskarpheten øker ...

Both are correct, and both mean the same thing here.

This is because Norwegian follows the V2 rule in main clauses: the finite verb usually comes in the second position.

The first part of the sentence, Dersom bevegelsesuskarpheten øker, is a subordinate clause placed first. When that whole clause comes first, the main clause must begin with the verb:

• Dersom bevegelsesuskarpheten øker, bruker vi stativet.

Not:

• Dersom bevegelsesuskarpheten øker, vi bruker stativet. ❌

So the pattern is:

• [subordinate clause], [verb] [subject] ...

For example:

• Når det regner, blir vi hjemme.
• Hvis han kommer, starter vi.

This is one of the most important word-order patterns in Norwegian.

Yes, øker is the present tense of å øke (to increase).

In Norwegian, the present tense is often used in sentences like this, even when English might sometimes think in a more future-oriented way.

So:

• Dersom bevegelsesuskarpheten øker ... = If the motion blur increases ...

That is normal Norwegian usage. You do not need a special future tense here.

It is a compound noun, which is very common in Norwegian.

It can be broken down like this:

• bevegelse = movement, motion
• uskarphet = blur, unsharpness
• bevegelsesuskarphet = motion blur
• bevegelsesuskarpheten = the motion blur

There is also a linking -s- in the middle:

• bevegelse + s + uskarphet

Norwegian often forms technical or descriptive words by combining smaller nouns into one long word. English often writes these as separate words, but Norwegian usually writes them as one word.

The ending -en is the definite singular ending here. It means the.

So:

• bevegelsesuskarphet = motion blur
• bevegelsesuskarpheten = the motion blur

Unlike English, Norwegian usually puts the definite article at the end of the noun instead of using a separate word like the.

This is called the suffixed definite article.

For the same reason: -et is the definite singular ending for a neuter noun.

So:

• et stativ = a tripod / a stand
• stativet = the tripod / the stand

Here, stativet suggests a specific tripod, probably one already known from the situation.

If you wanted to say a tripod, you would say:

• Vi bruker et stativ.

But the sentence uses:

• Vi bruker stativet.

So the meaning is more like we use the tripod.

Yes. Stativ is a neuter noun in Norwegian.

Its forms are:

• et stativ = a tripod
• stativet = the tripod

That is why the definite ending is -et, not -en.

Compare:

• masculine/common gender: bilen = the car
• neuter: huset = the house

So stativet follows the normal neuter pattern.

Because in Norwegian, definiteness is usually shown by an ending on the noun.

English:

• the tripod
• the motion blur

Norwegian:

• stativet
• bevegelsesuskarpheten

So the idea of the is already built into the noun itself.

A separate article like den/det/de is used in some cases, especially with adjectives, for example:

• det store stativet = the big tripod

But without an adjective, just stativet is enough.

In this sentence, bevegelsesuskarpheten is definite, so it sounds like a specific, context-relevant amount or instance of motion blur—for example, the blur in the image we are talking about.

If you used the indefinite form, it would sound more general:

• Dersom bevegelsesuskarphet øker ... — this is not very natural here

In practice, the definite form is more natural in this sentence because we are talking about the motion blur in the current situation.

Yes, in normal written Norwegian you use a comma after the initial subordinate clause:

• Dersom bevegelsesuskarpheten øker, bruker vi stativet.

The comma helps separate the if-clause from the main clause.

This is standard and expected in writing.

Yes. You can put the main clause first:

• Vi bruker stativet dersom bevegelsesuskarpheten øker.

This means the same thing.

Notice the difference in word order:

• When the sentence starts with the subordinate clause: bruker vi
• When the sentence starts with the main clause: vi bruker

So both are correct:

• Dersom bevegelsesuskarpheten øker, bruker vi stativet.
• Vi bruker stativet dersom bevegelsesuskarpheten øker.

It is understandable, but it is more of a technical or photography-related word than an everyday casual word.

A native speaker would absolutely understand it in the right context, especially in photography, video, optics, or image processing. But it is not the kind of word people use all the time in ordinary conversation.

That long, compact style is very normal in Norwegian technical vocabulary.