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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Can i use these lenses on my Scarlet ?

P

Patrick A.

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Hi,

just one question, can use a sigma 10 mm f2.8 Ex DC (aps-c) and a Nikon 85 mm f1.4 AF-D, on my scarlet with no problem of vignetting?

(by the way do you have an opinion for the quality of those lenses?)


Best Regards,
 
the sigma will probably be fine for 4K and most likely vignette at 5K...if the optical quality is anything like the sigma 14mm (full frame) i used to have, i would probably say that there are few worse and quite a few that are better....but it is a ultra wide and probably does not have great resolution or contrast and probably shows quite a bit of CA....
the nikon is a full frame lens, so the scarlet won't come near the coverage, should not be any problem at all....afaik the 85 1.4 is a great lens, no real issues....don't forget that it will be close to 150mm on scarlet at 4K
 
He's talking crop factor. The crop factor for 4K is 1.6. 85*1.6=136. So the composition that you end up with with that lens on 4K is the same that you would get with a 136mm lens on full frame 35mm film or sensor.
 
not sure what else to call it....crop factor, focal length multiplier,....in the end, when you look through it, it looks like a 136 would look through a full frame camera....
of course the 85 is still the same lens it always was...just a different crop for 5K or 4K or 3K....
similar to using it on a 5D and a 7D......
either way, the 85 is a great lens, the sigma is not so great....and i would expect some dark corners on 5K with it....
 
Why are we comparing the coverage of lenses to full frame stills cameras? We shoot motion, right? The whole crop factor thing is just confusing to a lot of people, especially when it gets used in relation to a lens. I still hear people saying "this lens will turn into this lens when used on this camera". All I'm attempting to do is make people think in terms of what sensor size they are shooting on rather than how it relates to a 5d.
When I used to shoot super16, I would reach for the 9.5mm for a wide angle, when I shoot super35, I use the 18mm. Simple as that. The crop factor term is confusing and should only really be applied to discussions about sensors, not lenses.
Even MTF services, who make lens adapters for f3's etc say of their adapter:"( note. Using this adaptor will introduce a magnification factor of 1.5X with full frame lenses). ". You know what, MTF? It won't . The adapter is dumb, there will be no magnification involved by using this adapter. The lens will be the same. The imaging chip, however, is smaller than full frame so it won't use as much of the lens coverage as the lens was designed for but that's not the way that this statement reads.
All that I'm asking for is that the correct terminology be used and used when it is appropriate. The op said nothing about full frame, why even bring it up? Dx (aps-c) sensor size and super35 (4k) sensor size is quite similar so the lens coverage will be similar as well.
 
Thank's you for all your answers and sorry for my ignorance, my last camera was an XDCAM... not the same world :mellow:
 
I'm there with you Shane.
If I had a dime for each of these Qs I get every day....
90% of these guys that ask never shot FF film still camera...
Yet they are all into the "crop factor"
Can we ban the phrase "crop factor" on RU and auto replace it with "I haven't a clue"? :)
Patrick that is absolutely NOT directed at you- I'm just tired of these questions- I wish we'd moved on...
 
This crop factor thing bugs me to no end. Since when did a 5D become a benchmark for motion pictures? What happened to the decades of motion picture shot on 35mm film going vertically through the gate, thus giving us what we now know as a "movie"? I like to use this as my personal benchmark, and I think I'm not alone...
 
Really sorry if I offended anyone here....simply pointing out what might be obvious to some and not so much to others....and this has nothing to do with the 5d...
i am not sure how one would then explain that the same lens on a scarlet or epic provides a different view area depending onif you are shooting 5k or 4k or 3k....
or in other words what would the correct terminology be to describe the fact that in order to get the same crop you have to use a 50 for 4k and a 75 for 5k ( or whatever the lenses would be)
 
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