Brown specks on fan leaves, not totally sure if a defiency or fungal

[PGwojowski]

Also is my yield compromised?

 

[Redneckx]

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Also is my yield compromised?

This looks like a Calmag def. to me.
Not a big thing, if y only have a few weeks to go and I don't think your yield will suffer much.
Which flower week are the plants and how long does the strain take?

 

[PGwojowski]

This looks like a Calmag def. to me.
Not a big thing, if y only have a few weeks to go and I don't think your yield will suffer much.
Which flower week are the plants and how long does the strain take?

It’s a Northern Lights autoflower with a life span of 10-12 weeks. Currently on day 3 of week 9.

 

[Redneckx]

It’s a Northern Lights autoflower with a life span of 10-12 weeks. Currently on day 3 of week 9.

Alright so the time schedule is on track, just keep an eye of the rh% and enough ventilation.
Maybe give them a feed with calmag and after that i'd stop using it.
Applying calmag too late gives a harsh flavour in the buds, same to too much nitrogen.
Also common the yellowing leaves which show "autumn signs" during their end life cycle, except y keep feeding heavy.

Stay below 55% Rh and y'll be good. Lower to 40-45% to avoid rot and to get more compact buds.