Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4? at DVinfo.net

Go Back   DV Info Net > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic LUMIX G / GF / GH / GX Series

Panasonic LUMIX G / GF / GH / GX Series
4K and AVCHD on a Micro Four Thirds system camera with interchangeable lenses.


Reply
 
Thread Tools Search this Thread
Old June 27th, 2014, 11:13 PM   #1
Regular Crew
 
Join Date: Jan 2010
Location: Seattle, Washington
Posts: 173
Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?

I'm contemplating a GH4 with a sigma 18-35mm or a Voigtlander 17mm. I'd really like the versatility of the range but not sure how the sigma would hold up when it comes to cropping. I'm looking at getting a GH4 strictly for architecture and cropping during interviews and speakers during events. This leads me to another question. About how much can you crop the image in 4k before you start to see image degradation?

Thanks!
__________________
Lead Videographer/Editor at TSP Video
www.tspvideo.com
Edward Calabig is offline   Reply With Quote
Old June 28th, 2014, 12:25 AM   #2
Major Player
 
Join Date: Nov 2008
Location: Melbourne Australia
Posts: 604
Re: Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?

Hi Edward,
The Metabones Speed Booster reduces the focal length of the lens whereas you seem to be wanting to effectively increase focal length by cropping. In this case you may be better off with an adapter that is optics free (and cheaper) so that you get the full 18-35 mm of the Sigma 18-35. The GH4 has an EX Tele Conv. Func(tion) that more than doubles the image size without loss of quality which may be of interest. However it does not work in 4k.
Alastair Traill is offline   Reply With Quote
Old June 28th, 2014, 12:44 AM   #3
Regular Crew
 
Join Date: Jan 2010
Location: Seattle, Washington
Posts: 173
Re: Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?

Ah great I did not know that! Thanks.
__________________
Lead Videographer/Editor at TSP Video
www.tspvideo.com
Edward Calabig is offline   Reply With Quote
Old June 29th, 2014, 06:59 PM   #4
Regular Crew
 
Join Date: Aug 2004
Location: Stevens Point, Wi
Posts: 156
Re: Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?

Edward;
4k is 4x the resolution of 1080 so if your output is 1080 I believe you can crop 100% and maintain the same resolution as 1080.

Don't take this to the bank however.

Kent
Kent Jakusz is offline   Reply With Quote
Old June 29th, 2014, 08:45 PM   #5
Inner Circle
 
Join Date: Dec 2005
Location: New York City
Posts: 2,615
Re: Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?

4K is a little over twice the size of 1080 HD which is slightly less than 2K. So you can conceivably take a 4K file and zoom in 200% in an HD timeline without losing detail.
__________________
William Hohauser - New York City
Edit/Camera/DCP production/Animation
William Hohauser is offline   Reply With Quote
Old July 3rd, 2014, 08:32 AM   #6
Regular Crew
 
Join Date: Apr 2010
Location: London
Posts: 95
Re: Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?

What would the focal length and aperture (full frame equivalent) be for the Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?
Any actually using this combo, and I want to compare versus SLR magic 25mm f/0.95
Rob Hargreaves is offline   Reply With Quote
Old July 13th, 2014, 08:41 PM   #7
Major Player
 
Join Date: Jun 2008
Location: Charlottesville, VA
Posts: 700
Re: Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?

I use the Sigma 18-35 boosted and unboosted on GH2 and AF100... it's a very very very good bit of glass.

Caveats... it's large, so unbalances the GH cameras a bit - not unusably so. Also, make sure you get a good quality adapter. I have two glassless adapters from Fotodiox, one "pro" and one not so pro. The non-pro version renders the lens varifocal. With the Fotodiox Pro adapter and the Speedbooster, the lens is parfocal (Metabones also makes a non-boosted Nikon G adapter with a far better iris ring design than competing models). While the focus ring doesn't have hard stops (it does have 'soft stops'), it's fully manual and repeatable, and works well with a follow focus when desired.

Boosted, the lens becomes: [18-35 f1.8]*0.71 = ~13-25 f1.3
On standard 2x crop, FF equivalent would be 26-50mm. On 2.3x 4k crop, FF equiv would be 30-58mm

Other similar lenses I own are the Voigtlander 17.5, Leica DG 25/1.4, and several boosted/unboosted Leica R primes (28/2.8, 35/1.4, 50/2). Have to admit I don't use them much lately, it's too damn easy to just pack the Sigma and two adapters and have everything I need in a single 1-lb package. I use the PL25/1.4 more than the others in a GH2-based fly pack for small jobs, based its small size and quick autofocus.
__________________
Freelance pudgy bearded lighting camera operator
www.mcbob.tv
Kevin McRoberts is offline   Reply With Quote
Old July 14th, 2014, 05:44 AM   #8
Major Player
 
Join Date: Apr 2008
Location: Denmark
Posts: 491
Re: Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?

Hi Thanks for info here.
I miss a wide angle and I have considered the panasonic 12-38 but maybe the sigma will do almost the same. with the use of the speedbooster?
Bo Skelmose is offline   Reply With Quote
Old July 14th, 2014, 08:49 AM   #9
Major Player
 
Join Date: Jun 2008
Location: Charlottesville, VA
Posts: 700
Re: Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?

Sigma will cover roughly the same focal lengths, and be faster, but will require an adapter change to reach the upper/lower limits (13-25 with SB, 18-35 w/o). It's also much larger and has auto-nothing.

Lumix 12-35 wins from a convenience standpoint, auto features work amazingly well on GH4, I'd stick with it if I never needed to go faster than f2.8
__________________
Freelance pudgy bearded lighting camera operator
www.mcbob.tv
Kevin McRoberts is offline   Reply With Quote
Old August 14th, 2015, 09:17 AM   #10
Major Player
 
Join Date: Apr 2006
Location: Amsterdam
Posts: 355
Re: Opinions using a Sigma 18-35mm 1.8 Nikon with Speedbooster on GH4?

Quote:
Originally Posted by Kevin McRoberts View Post
I use the Sigma 18-35 boosted and unboosted on GH2 and AF100... it's a very very very good bit of glass.

Caveats... it's large, so unbalances the GH cameras a bit - not unusably so. Also, make sure you get a good quality adapter. I have two glassless adapters from Fotodiox, one "pro" and one not so pro. The non-pro version renders the lens varifocal. With the Fotodiox Pro adapter and the Speedbooster, the lens is parfocal (Metabones also makes a non-boosted Nikon G adapter with a far better iris ring design than competing models). While the focus ring doesn't have hard stops (it does have 'soft stops'), it's fully manual and repeatable, and works well with a follow focus when desired.
Kevin, I just got the Sigma 18-35 f1.8 Canon mount to use with my Speedbooster on my GH4. Never even considered using a plain adapter but your post made me realize I could make this lens even more versatile with a slight investment for a simple EF to M43 adapter.

Does this work flawlessly? Do you still think the Fotodiox Pro adapter is the best way to go? No artifacts, vignetting or whatever?
__________________
www.imaginevideo.nl Just published the second of my viral mini-doc series '100'
https://youtu.be/ZqHFBrV-oOc
Jeroen Wolf is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic LUMIX G / GF / GH / GX Series

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 12:31 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network