GL Optics Sigma 18-35 Rehoused - Group Buy

[Christopher Barrett]

Nice! I went for the 300, can't wait to see it!

 

[David Kellermann]

Looks great. I presume its marked for f stops not t stops?

According to DXOmark, the f stop equals the T stop on this lens (a true T1.8).

 

[Alex Boothby]

Looks great David. Any word on the front diameter and the weight of the 300 d version?

Here are some photos of the 300 degree version

 

[Kirk.Attard]

Well that looks polished. Nicely done. It will be the first zoom for my pl set very soon i think

 

[Ketch Rossi]

Excellent work from Nan on the 300 degree version indeed, wish He'll do the 24-70 & 70-200 exactly like it, no distracting color rings or anodize mounts, just like this!!

 

[David Kellermann]

Looks great David. Any word on the front diameter and the weight of the 300 d version?

Hi Alex,

the front diameter is 95mm, the filter ring is 77mm, same as on the 120 degree version.

Don't know the exact weight, but afaik it's ~1.5kg / 3.3lbs

 

[David Kellermann]

Well that looks polished. Nicely done. It will be the first zoom for my pl set very soon i think

Feel free to send me a pm or mail when you have more questions or want to order a lens. I'm shipping GL optics lenses from Germany, so there aren't any customs for EU customers.

I'm located in South West Germany, close to the French and Swiss border, if anyone wants to try it.

 

[Alex Boothby]

Thanks David! Very useful info.

BTW: do you sell a 95mm - 100mm setup ring to permanently mount on the front? I'm aiming for matching fronts with the 100mm Schneide Xenon primes.

Hi Alex,

the front diameter is 95mm, the filter ring is 77mm, same as on the 120 degree version.

Don't know the exact weight, but afaik it's ~1.5kg / 3.3lbs

 

[Patrick Tresch]

Hello David,

Could you make some r3d snapshots at 5k wide open for 18 24 and 35mm?

City scape would be great. I'm eager to pull the trigger for the nikon 300 version.

Thanks

Patrick

 

[David Kellermann]

Thanks David! Very useful info.

BTW: do you sell a 95mm - 100mm setup ring to permanently mount on the front? I'm aiming for matching fronts with the 100mm Schneide Xenon primes.

I'll ask Nan at GL optics to make them or order some at a local cnc shop and will add them to my shop.

EDIT: You can order the Sigma lens with a 100mm front at 150USD extra (the lens would be custom made). A "step-up ring" would also be possible, but it might not be a good idea to use a clamp-on mattebox on it, to avoid damaging the lens.

Hello David,

Could you make some r3d snapshots at 5k wide open for 18 24 and 35mm?

City scape would be great. I'm eager to pull the trigger for the nikon 300 version.

Thanks

Patrick

I should have the lens early next week. I'll make some test videos and post the R3D files, incl. some R3D snapshots.

 

[Alex Veitch]

According to DXOmark, the f stop equals the T stop on this lens (a true T1.8).

That's good. Think I need to get one of these...

 

[David Kellermann]

Nan just sent me this video to show the extended focus throw of the GL optics T1.8 18-35mm 300 degree lens

 

[Bob Gundu]

Nan just sent me this video to show the extended focus throw of the GL optics T1.8 18-35mm 300 degree lens

Thanks for the update David!

 

[Alex Veitch]

David, do you know if it is par focal?

 

[Olivier Madar]

David, do you know if it is par focal?

i tested the 120° and it is not. but very good lens anyway.

olivier

 

[Bob Gundu]

I don't have mine yet but Erik Naso seems to think it's parfocal.
http://www.youtube.com/watch?v=U23VFBj73K0

 

[Jesper Sichlau]

It's not a 100% parfocal - at least not wide open, but almost.

 

[George Su]

Is it just me, or is most of the added rotation at close focus?

Nan just sent me this video to show the extended focus throw of the GL optics T1.8 18-35mm 300 degree lens

 

[Kwan Khan]

It's not a 100% parfocal - at least not wide open, but almost.

Correct

 

[Mathias Erichsen]

It's not a 100% parfocal - at least not wide open, but almost.

I find this quite dissapointing..
It is stated in the Q&A in the first post of this thread that it is. (Or did i read that one wrong?)

---snip---
5) Will the lens keep focus when zooming?

Of course the Lens will hold on the focus when you zoom it.