Disassembly – 7artisans 7.5mm F2.8 Fish-Eye lens---by Iurii Zvonar

In this article I'm showing disassembly of the front area of 7artisans 7.5mm F2.8 FishEye lens and sharing thoughts on its build quality.

I've received this interesting lenssample about month ago from 7artisans, as a redirected customer return ( Thank you 7artisans! ).

I was very curious why the lens got returned   expecting some issue, and also interested to try

another fisheye on Fuji ( last one I’ve used before was quite good Samyang 8mm F2.8 UMC Fish-eye Mark II).

Fortunately it happened to be great and sharp 7artisans 7.5mm F2.8 lens sample. so first I’ve spent few

weeks shooting with it prior to the disassembly

attempt.

This lens is much sharper than 7artisans 12mm F2.8

and personally it’s more fun to use it: ) First I’d like

to share few impressions.

It’s the only 7artisans lens I’ve seen so far that doesn’t have Serial Number.Another interesting thing – this 7.5mm F2.8 has exactly same built-in petal hood shape as 7artisans 12mm F2.8, and their front lens caps are inter changable(though 7.5mm front cap is soft plastic snap on type, while 12mm has petalshape fit cap).

Disassembly   steps

I’ve noticed quite thick glue traces around the front black ring with letters, so decided to start disassembly from different point. You need to focus lens at 0.12m first, then unscrew three small bolts between the hood and focus ring.

Once that is done, unscrew the front area CCW by holding the hood.

You’ll get access to the aperture chamber and inner glass surfaces.

Next step is a bit tricky, you need to push whole front lens section through the hood up to break up the glue connection.

There is more gentle way to do that byrotating lens section CCW – it will unscrew it out from the front ring withletters.

IMPORTANT: front ring with letters secures the front glass,so keep up directed up   while unscrewing.

Once that is done, unscrew the front area CCW by holding the hood. I’ve pulled front glass element to check how it’s made – there is large

black enedarea on the opposite glass surface borders for reducing reflections. At this point you can completely disassemble front area optics.

‍

‍

I’ve secured front glass element back by attaching front ring with letters andscrewing it CW.

Att his point you can assemble front lens section back without the hood by screwing it CW inside main lens frame. Lens will look  

very   strange without the hood : )   

I’ve put it on camera and took few test shots. Everything works like before thedisassembly.

Of course I’ve unscrewed front lens area CCW again, then focused it to 0.12m andattached the hood. Next step is to screw in CW   lens section tightly.

Finally you need to rotate hood to the optimal position and screw in three tiny metalbolts.

The lens is quite solidly built. I can see that aperture ring is connecting to the inner aperture lever through the large bolt you can find   on the ring bottomarea. Focus ring is very convenient and I very like the minimal 0.12m distancefor close-up fisheye shots.

I think it’s great decision to use soft snap-on plastic cap,   it protects the front lens and also the hood itself   fromaccidental hits. However I’ve noticed that

cap become slightly loose afterh eating by direct sunlight. I’m personally not a big fun of using glue in thelens assembly (small bolt would work better),

but it’s acceptable for budgetlens.