While I have already converted all the metamagic feats in the PF1 Core Rulebook to Starfinder, there are tons more official PF1 metamagic feats out there we can use to create interesting magic options for spellcasters in Starfinder.

Here are a few converted from the APG.

Focused Spell
When you cast a spell that normally affects more than one creature, you can focus it on one opponent that finds it more difficult to resist.
Prerequisites: Ability to cast spells.
Benefit: When casting a spell that an area with a 5-foot-radius or larger, or targets more than one creature, you can choose to cast it with a casting time of 1 full action. This focuses the spell on only a single target within the spell effect. The saving throw DC to resist the spell is increased by +2 for that creature. You must choose which target to focus the spell on before casting the spell. Spells that do not require a saving throw to resist or lessen the spell’s effect do not benefit from this feat.

Once you have used this ability, you cannot do so again until after you next recuperate*. If your caster level is 5th or higher, you can instead expend 2 Resolve Points to use this ability again without recuperating.

Intensified Spell
You can cast damaging spells at higher spell level, to increase their damage.
Prerequisites: Ability to cast 2nd level or higher spells.
Benefit: When you cast a damaging spell with a casting time of 1 standard action, that is at least 1 spell level lower than the highest-level spell you can cast, you may cast it with a casting time of 1 full action using a higher-level spell slot than it normally takes. Such spells do 2 additional dice of damage for every level the spell slot you expend is than the spell’s normal level. The extra dice deal the same type of damage and follow all the rules of the original spell. You also calculate the spell’s save DC using the level of spell slot expended, rather than its normal spell slot. If you have other feats or abilities that depend on the spell level of the spell you cast, you treat its spell level as being equal to the level of spell slot you use to cast it.

Lingering Spell
Your spell clings to existence, slowly fading from the world.
Prerequisites: Ability to cast one or more instantaneous spells that affect an area.
Benefit: When you cast an instantaneous spell that affects an area and that is at least 1 level lower than the highest-level spell you can cast, you may cause it to persist until the beginning of your next turn. Those already in the area suffer no additional harm, but other creatures or objects entering the area are subject to its effects. A lingering spell with a visual manifestation obscures vision, providing concealment beyond 5 feet and total concealment beyond 20 feet.

Once you have used this ability, you cannot do so again until after you next recuperate*. If your caster level is 5th or higher, you can instead expend 2 Resolve Points to use this ability again without recuperating.

Merciful Spell
You can make your damaging spells less-than-lethal.
Prerequisites: Ability to cast spells that deal damage.
Benefit: When you cast a spell, you can choose for the damage it does to be nonlethal.

*Recuperate is my proposed term for when a character expends a Resolve Point and rests for 10 minutes, allowing them to regain all their Stamina Points.

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