All comments by Ruben Kremer

Ruben Kremer Last comment posted on September 9, 2016 at 22:32
Post: Focal Reducers: Speed Booster, Lens Turbo and Light Cannon
In reply to: Mathieu
User linked website: http://rubenkremer.nl/
I'm not quite sure what your question is, but there certainly are focal reducers for Canon glass straight onto the BMPCCs MFT mount. Best example would be the Metabones Speedbooster BMPCC edition ;-) ... specifically designed to fit specifically the BMPCC sensor (and that one alone)
Post: Focal Reducers: Speed Booster, Lens Turbo and Light Cannon
In reply to: George Philip
User linked website: http://rubenkremer.nl/
Hi George,

Thanks for your comment!

I'm not aware of any tests of the focal reducer you mentioned. But I'm also not familiar with it. I looked it up on YouTube, and the footage looks alright - maybe slightly on the soft side - but very usable. The footage 'feels right', as far as I'm concerned. And at 70 quid, you can't really expect Metabones levels of sharpness and crispness. It's a matter of taste and 'good enough'-level you can accept.

I should update the post on my site concerning the one I got from eBay. It was good for a long while, but somehow the optics have gone misaligned and its now just more of a pain than profit.
Post: Focal Reducers: Speed Booster, Lens Turbo and Light Cannon
In reply to: john knight
User linked website: http://rubenkremer.nl/
Hi John, sorry to say that I've got no experience whatsoever with the OM lenses. There are quite a few adaptors from Metabones for Sony E, but if they don't produce a OM > E adapter - there's probably a technical dificulty with realising that, which might be the distance from the lens to the sensor, or something like that. Sorry to not being abled to help you further...
Post: Focal Reducer comparisonon the Pocket Cinema Camera
In reply to: sivakumar
User linked website: http://www.rubenkremer.nl/
Get the EOS mount. The FD mount is only suitable for very old Canon lenses. EOS is what you need.
Post: Archiving and backing up your projects
In reply to: Paolo
User linked website: http://www.rubenkremer.nl/
Thanks for the BTRFS hint - heard about it once or twice, but I never looked into it.

Though it seems interesting, I'd like to keep my archive outside of a running system - at least for now. Online/cloud backups seem like a viable solution for work-in-progress projects as soon as a fiber internet connection with fast upload is available at the workstation-end. Though I'd probably prefer to use sattelite units with Bittorrent Sync for this purpose. I'm thinking of a low-powered Raspberry Pi with perhaps one big-ass drive attached. Of course two of these units on two seperate locations would do best.
Post: Focal Reducer comparisonon the Pocket Cinema Camera
In reply to: Björn Sonnenschein
User linked website: http://www.rubenkremer.nl/
I can't say that I don't have a slight bit of softness in the corners with the Roxsen Focal Reducer (FR) on a M4/3 sensor. The M4/3 sensor stills cam that I do have doesn't have a resolution high enough for fair judgement. However I specifically bought this FR for use with the BMPCC, the smaller sized sensor will crop the image - so I'm not too concerned about slight softness in the corners on a larger M4/3 sensor. For me, on the BMPCC, it's a pretty good deal. I'm sure, I'd probably prefer the Metabones ones, but 'money' ;-)
From what I can gather from other people's experiences - the Transcends are not consistent enough. The card needs to be baked to handle 60MB/s for it to be a useful DNG compatible card. The Transcend has a 'bottom' write speed of 30MB/s and can sometimes exceed up to (and sometimes over) 60MB/s ... but not consistently, sadly. Therefor I'd seen this card 'not suitable' for DNG recording. Might work fine with ProRes - especially since we now have multiple options. But if you're into DNG - then stay clear ;-)
Post: Focal Reducer comparisonon the Pocket Cinema Camera
In reply to: Ton
User linked website: http://www.rubenkremer.nl/
I personally have no experience with the Metabones Speedbooster series. However, from what I can gather from others - it is optically very good.

The Roxsen adapter ain't bad, but it's not 100% without 'hiccups' either. When (sun)light hits the lens at a certain angle, it tends to give the image an purple hue. Not something that can't be easily fixed, but noteworthy.

But ... when taking the price into consideration - one cannot expect perfection at that pricepoint. If you want the ultimate quality: Metabones is the way to go. If you don't mind a little less than perfect, then save some cash and get a Roxsen, and a nice Samyang prime to go with it ;-)
Post: Focal Reducer comparisonon the Pocket Cinema Camera
In reply to: Dave
User linked website: http://www.rubenkremer.nl/
Hi Dave,

Nope. You can't use the HolyManta ND and a focal reducer like this Roxsen, nor the Metabones SpeedBooster. Simply because both 'devices' are lens-adapters for larger sensor lenses to a smaller sensor mount.
Post: Focal Reducer comparisonon the Pocket Cinema Camera
In reply to: Moe
User linked website: http://www.rubenkremer.nl/
Hey Moe,

I did try the 18-135mm EF-S kitlens I had lying around. However that simply didn't fit. It won't mount on the Roxsen. A crop Nikon lens should work in theory, when mounted via a Nikon to EF adapter. Again: in theory ;-)