lmackreath Posted November 13, 2017 Share Posted November 13, 2017 Morning all. I have a GH5 and a bunch of native lenses and am looking at more options such as the Sigma 18-35 1.8, Sigma Art 24 1.4 and Sigma 17-50 F.28 I am confused about vignetting issues with the Zhongyi? I cannot afford going down the metabones route and it seems the lens turbo is a pretty decent alternative. What I need to know though because its made for full frame lenses what lens will and wont work on it with the GH5? I have been told using it with the sigma 18-35 is a total no go as thats an aps-c lens so expect heavy vignetting? has someone got real world examples of this? What about the Sigma 24 1.4 art lens? That is a full frame lens so would that be ok? Anyone with any experiences of the Zhongyi on a GH5 and what lenses they have would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
anonim Posted November 13, 2017 Share Posted November 13, 2017 Slightly bigger crop factor of Zhongyi II is your friend It has crop factor lowering to 0.726 so you are pretty inside safe margin even with 18-35. Personally I used Zhongyi with GH2 witch has multiaspect ratio crop smaller than GH5 - of 1.86 - and there was no problem with full frame lenses, so you should no worry at all with Sigma Art full frame lenses. BTW I found that Zhongyi has very little bit sharper reproduction than first version of Metabones speedboosters. Quote Link to comment Share on other sites More sharing options...
lmackreath Posted November 13, 2017 Author Share Posted November 13, 2017 Just now, anonim said: Slightly bigger crop factor of Zhongyi II is your friend It has crop factor lowering to 0.726 so you are pretty inside safe margin even with 18-35. Personally I used Zhongyi with GH2 witch has multiaspect ratio crop smaller than GH5 - of 1.86 - and there was no problem with full frame lenses, so you should no worry at all with Sigma Art full frame lenses. Is this true? I know the Zhongyi was safe on the GH4 in 4k because of the extra crop but I have been told the sigma 18-35 on the GH5 with the Zhongyi is a total no go because there is no extra 4k crop on the gh5? Quote Link to comment Share on other sites More sharing options...
anonim Posted November 13, 2017 Share Posted November 13, 2017 Well, make calculation alone. With Zhongyi you get 1.452 crop factor. It is inside 18-35 safe margin - for Nikon APS crop is 1.5 and 18-35 is designed for it with some comfotable zone more - e. g. 1.45 is OK. IronFilm 1 Quote Link to comment Share on other sites More sharing options...
lmackreath Posted November 13, 2017 Author Share Posted November 13, 2017 this is what i have been told eslwhere "I think it is only the Lens turbo failing. The Sigma 18-35 is designed to cover a Nikon DX sensor with a diagonal of 28.4mm. 28.4*0.726=20.6 which is still larger than the GH5's 19.9mm with 16:9 crop. The actual image circle of the lens at 18mm seems to be around 33mm, so an ideal focal reducer would produce a circle of 24mm. I measured only 19.2mm through the lens turbo." Quote Link to comment Share on other sites More sharing options...
Julien416 Posted November 13, 2017 Share Posted November 13, 2017 The problem with speedbooster and Sigma 18-35 is only with the speedbooster XL. You're safe with the lens turbo. Quote Link to comment Share on other sites More sharing options...
anonim Posted November 13, 2017 Share Posted November 13, 2017 @imackreath That quote - is it some of the test calculation problem for photo-elementary school No, as julien416 exactly say - you are safe except from XL enemy. Quote Link to comment Share on other sites More sharing options...
lmackreath Posted November 13, 2017 Author Share Posted November 13, 2017 Thanks for your replies! this guy tried the sigma 18-35 gh5 with speedbooster XL and still had no vignetting issues? Quote Link to comment Share on other sites More sharing options...
anonim Posted November 13, 2017 Share Posted November 13, 2017 As I already wrote - 18-35 has comfortable zone, I've say to 1.38-1.4 crop (I tested it when worked with 18-35 with BMPCC speedbooster on m43 bodies and had to enlarge ratio because of vigneting). XL make 1.28 crop factor and from my experience it is out of being safe, but tastes are different ("said devil and sit down into nettles" as said proverb in my locals (And... I vote not to letting go all of your native lenses in favor to new love. if you have them, keep at least 15 and 42.5 mm 1.7... my 2 cents although I'm not fan of autofocus lenses.) Quote Link to comment Share on other sites More sharing options...
lmackreath Posted November 13, 2017 Author Share Posted November 13, 2017 3 minutes ago, anonim said: As I already wrote - 18-35 has comfortable zone, I've say to 1.38-1.4 crop (I tested it when worked with 18-35 with BMPCC speedbooster on m43 bodies and had to enlarge ratio because of vigneting). XL make 1.28 crop factor and from my experience it is out of being safe, but tastes are different ("said devil and sit down into nettles" as said proverb in my locals (And... I vote not to letting go all of your native lenses in favor to new love. if you have them, keep at least 15 and 42.5 mm 1.7... my 2 cents although I'm not fan of autofocus lenses.) Thanks!..if I can get a good enough price for the 12-35 f2.8 i will keep the 25mm and 42.5! Quote Link to comment Share on other sites More sharing options...
anonim Posted November 13, 2017 Share Posted November 13, 2017 ... Or maybe sell also and 25mm and buy 15mm - with so efficient ETC in GH5 you get two-in-one and it's a pity not to use it. 12-35 I - most boring pricey dolly (with such annoying zoom flickering in her clinical eyes) Quote Link to comment Share on other sites More sharing options...
lmackreath Posted November 13, 2017 Author Share Posted November 13, 2017 Thanks again for all your responses... If anyone has any test footage with this combo would be keen to see it.. especially how good\bad the zhongyi lens turbo is compared to the metabones Quote Link to comment Share on other sites More sharing options...
anonim Posted November 13, 2017 Share Posted November 13, 2017 https://***URL removed***/forums/thread/3515608#forum-post-51792972 Comparison between first versions - especially Lens Turbo II in a meantime become significantly better - of course finally without central blue spot. Quote Link to comment Share on other sites More sharing options...
Fritz Pierre Posted November 13, 2017 Share Posted November 13, 2017 @Imackreath...just watch the video from the guy on the XL speedbooster you posted...I use the speedbooster XL with 3 APS-C lenses and IBS turned on and I don't get vignetting in 16x9 on even the Tokina 11-16 which gets down to 7.4 mm wide!...in other aspect ratios you may, but it's very simple to fix in post....Though I don't own the booster you're getting, you should have no problems, unless you're really stressing the IBS unreasonably and in that case a bit of crop in post solves the issue....personally I would always go with the widest FOV and fastest booster and fix later where needed. Quote Link to comment Share on other sites More sharing options...
lmackreath Posted November 13, 2017 Author Share Posted November 13, 2017 i suppose the question now is...do i want the tank that is the sigma 18-35 with adapter on my gh5 compared to my nice neat and small native lenses? Is the IQ of the Sigma and Low light opportunities that the lens turbo offers worth it? Quote Link to comment Share on other sites More sharing options...
funkyou86 Posted November 13, 2017 Share Posted November 13, 2017 You're safe with lens turbo, I have been using it on my GH4, now on my GH5 with Sigma 18-35 and has no vignetting in 16:9 or 4:3 mode. Go for it, overpriced speedboosters can do us a favour. Quote Link to comment Share on other sites More sharing options...
lmackreath Posted November 13, 2017 Author Share Posted November 13, 2017 18 minutes ago, funkyou86 said: You're safe with lens turbo, I have been using it on my GH4, now on my GH5 with Sigma 18-35 and has no vignetting in 16:9 or 4:3 mode. Go for it, overpriced speedboosters can do us a favour. great to hear!...can you show me some example videos? Quote Link to comment Share on other sites More sharing options...
funkyou86 Posted November 14, 2017 Share Posted November 14, 2017 9 hours ago, lmackreath said: great to hear!...can you show me some example videos? Most of the representative stuff is still in post production but here are few examples: Shot on Lens Turbo v. II + 18-35 + 85mm: https://www.youtube.com/watch?v=fYm-b4QR-is Shot on Lens Turbo v. II + 18-35 + Pentax 50mm https://www.youtube.com/watch?v=TxdJX06BP3E Some screengrabs of the 4:3 anamorphic mode with 18-35: http://blog.presstige.sk/post/163559806830/yesterday-we-were-on-field-shooting-with-an Quote Link to comment Share on other sites More sharing options...
IronFilm Posted November 14, 2017 Share Posted November 14, 2017 22 hours ago, Fritz Pierre said: @Imackreath...just watch the video from the guy on the XL speedbooster you posted...I use the speedbooster XL with 3 APS-C lenses and IBS turned on and I don't get vignetting in 16x9 on even the Tokina 11-16 which gets down to 7.4 mm wide!...in other aspect ratios you may, but it's very simple to fix in post....Though I don't own the booster you're getting, you should have no problems, unless you're really stressing the IBS unreasonably and in that case a bit of crop in post solves the issue....personally I would always go with the widest FOV and fastest booster and fix later where needed. Nifty trick is you can use the Tokina 11-16mm at 16mm on full frame! :-o Heck I have a friend who even uses it at 14mm and gets away with it for night/party shots. Quote Link to comment Share on other sites More sharing options...
lmackreath Posted November 14, 2017 Author Share Posted November 14, 2017 3 hours ago, funkyou86 said: Most of the representative stuff is still in post production but here are few examples: Shot on Lens Turbo v. II + 18-35 + 85mm: https://www.youtube.com/watch?v=fYm-b4QR-is Shot on Lens Turbo v. II + 18-35 + Pentax 50mm https://www.youtube.com/watch?v=TxdJX06BP3E Some screengrabs of the 4:3 anamorphic mode with 18-35: http://blog.presstige.sk/post/163559806830/yesterday-we-were-on-field-shooting-with-an lovely stuff!...one question...do you have to enter the focal length on the GH5 everytime you turn it on with the lens turbo on? Quote Link to comment Share on other sites More sharing options...
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