gessman wrote:
I'm not sure that I understand how such 'fine' glass as a Zeiss lens can make all that much difference in video when 1080p is shot at 2 megapixels. I don't understand all I know about that but I don't see much how lens resolution difference between a Canon and a Zeiss can make all that much of a difference on that size image made with a much smaller sensor than a FF 21 megapixel image - just how much can be resolved on a 2 mpx sensor? Nothing's coming to me.
Regarding your Zeiss 60mm macro, why don't you dazzle us here with a few shots from that lens and "store original" so we can see just how good it is for ourselves. I might just be talked into buying some Zeiss lens if I can truly see an improvement over what my Canon 100 2.8 II IS does. I'm always looking to do better and have plenty of room for that. I really appreciate having equipment that I know cannot be beaten because it helps me focus on the real problem - ME! If I know it's me, then I know I can make it better. Thanks for all your information and even though I'm not a videographer, I do have 1080p available on my 5D2. You never know - I might crank it up some day.
I'm not sure that I understand how such 'fine' gla... (
show quote)
You are correct in your questions - valid ones too! There is more than resolution that is critical.
1: Contrast is really important. To have the cleanest, clearest possible image after going through 12-36 surfaces of glass, bent, focused, and arriving in all the colors at the exact spot without losing any quality is a tough act to follow. The glass costs about $11,000 a kilo (I think that is what I heard), so other mfgrs try to find alternate sources and glasses - some good, but many - nyeahhh.
2: Then there is a design itself. That is complicated -
3: There is moving optics in a zoom lens, stabilization issues, internal focusing etc. At the end of the day, what does that image look like?
4: What does the boketh, the out of focus areas look like? Is it soft and buttery smooth, or ragged, sharp multi-shaped images combined. This is where many lenses crater. My Zeiss 28, 2.8 is a bit like that and I have to be careful when I shoot to avoid them if possible like at night with lights in the background. Yet the 180 prime is gorgeous. See below. The 60 macro, 50, 85 and 300 beautiful. Colors are rich. Contrast lovely.
Now, can a 1920x1080p sensor see the difference between these lenses? YES! Look at the video link I had posted. It is obvious. They used a camera that resolves 2500x 1400 or so. It is far superior to any DSLR video out there, hands down. So you will see a good rendering.
Now, when projected on a big screen, the imperfections are magnified to 20-30' across and then you will notice the uglies plainly. Throw in the imperfections in the sensors, the codec used, the bit rate in recording.
For the DSLR user, these enlargements are not encountered as the pictures are relegated to enlargements, snap shots and the likes. So there is a certain amount of forgiveness and the camera also takes high bit rates (14 for many Canon's) for each shot - which can't be done in movie images. If you did that, you would be shooting at about 1.8 TB/hour. So they have to find other solutions. It gets tough out there.
But the bottom line, is that experience has proven over and over again, that movie DP's will use only the best they can get their hands on because so much is on the line. They have taxed this subject to death. They use only what works to perfection. And those optics are Zeiss, Cooke, Agnieux, Schneider, Panavision, Fujinon (for TV broadcast) and a new breed of very high ends
from Sony and Canon (starting at about $5,000 each).
In my research and experience, I am finding a Zeiss consistency that it is worth it to have great optics and a great camera. Film makers have to put a $100,000 a day shoot on a little tiny flat space of 24x14mm, be it film or digital. They better get it right or Roger Rabbit is going to get fired.
Cheers,
Take 5
Zeiss 180 2.8, 1/80 sec. Here is an example of beautiful boketh - that buttery smooth background. The highlights are even and lovely. The image tact sharp. The contrast bang on. And this was shot in lousy / awful lighting conditions handheld. Yet, the shot pulled off well.
Zeiss 28 2.8 or 4 (can't remember). Here is a shot with a lousy boketh - notice how the backgrounds are mulitple images - not as soft as it should be. The colors are wonderful, the resolution tops, but the boketh is sub-standard. This lens does not fetch a high price on the used market. The 28 f2 - that is a different story and does not have the problems of the 2.8
Zeiss 28-85 (defective) shot at 28, f8 or so. This is a typical example of what GOES WRONG with a bad lens. In this case the lens has some internal flaws on the guides tracks thus making it defective. But what I want to show is the CA's that are very noticeable in the upper right when you look at the full size image. You will see purple fringing around the steam engines black pipes and bright sky. In a blow up, this is glaring and bad and unusable. In the center - it is fine, but on the sharp edges, yikes. I have replaced the lens with a new one and the problem no longer occurs - super clean throughout