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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 :)

Arri Mattebox

Thanks a lot, Mitch!
Mitch Gross said:
It is from evolution over time. Different products and different needs over the course of many decades. Varying lens designs with larger or smaller front elements, different sensor sizes for light projection coverage, etc.

The MP 25 & 50 both have 114mm fronts and the MP 150 has a 134mm front. 4x5.65 will work just fine for these lenses.
Click to expand...
 
We sell the MB28 as a kit with top and side flags included. But you can also choose to buy parts separated.

I did have one bit wrong in the comment on the Master Primes. Technically a 150mm is not fully covered by a 4x5.65 filter. It will not block the image, but it limits illuminating light from hitting the lens. You may lose 1/4 or so a stop of exposure. Of course people suffer this all the time when using mattes in their matteboxes, so it isn't a big issue, but just wanted to be clear.
 
Mitch, thanks again for answering my question.

But I got confused. First, why does it limit illuminating light from hitting the lens? Is it because of the diameter of the lens so big that the filter even cannot cover the whole front element area? If so, then MP12 will have the same problem too, because it is even 156mm. Actually, I don't quite picture how it creates the problem.

In order to avoid this problem, would you suggest me what size of filters I should use, please?

Also, in your answer, you talked about mattes. I wonder how mattes work, say in MB28. And why do we need mattes?

In fact, my understanding for the functions of matteboxes are:
1./ blocking flare and any light hitting the lens directly, so that the contrast of the image will be better. In this case, we will use mattes too, won't we?
2./ putting filters. As those cine lenses usually have very big diameter, using circular, screw-in filters is not common. (well, I must confess I don't know why it is not common and the reason why not using screw-in filters.)
3./ somehow protecting the lens.
what else I miss?

Thank you very much in advance.

*By the way, Mitch, I just ordered a TV Logic monitor from your web site. : )

Mitch Gross said:
We sell the MB28 as a kit with top and side flags included. But you can also choose to buy parts separated.

I did have one bit wrong in the comment on the Master Primes. Technically a 150mm is not fully covered by a 4x5.65 filter. It will not block the image, but it limits illuminating light from hitting the lens. You may lose 1/4 or so a stop of exposure. Of course people suffer this all the time when using mattes in their matteboxes, so it isn't a big issue, but just wanted to be clear.
Click to expand...
 
Is there a matrix or list somewhere that easily illustrates the size/configuration/features of all the various Arri matte box models? I am having a hard time keeping track of all the different models and their potential applications and/or limitations.
 
agree with you, Tom.
Tom Greenberg said:
Is there a matrix or list somewhere that easily illustrates the size/configuration/features of all the various Arri matte box models? I am having a hard time keeping track of all the different models and their potential applications and/or limitations.
Click to expand...
 
A mattebox shades the lens from direct, hard light as well as holds filters. As most people generally have many lenses or find they need to change filters from shot to shot, it is must faster and efficient to have filters go into trays in the mattebox than to screw onto the front of the lenses.

A 4x5,65 filter is not physically tall enought to completely cover the large front element of a MP 150 or an MP 12. On the 150mm, the only part of the image that will be projected to the RED's sensor is through the center of the lens, so you will not see the filter tray or mattebox in the frame. Put it is stopping light from reaching part of the glass, so it is lowering the overall illumination level by a little bit. On the MP 12, the field of view is so wide that the mattebox itself will come into view.

If you want filters that will cover everything then you should consider using the MB28 with 6.6"x6.6" filters. But these are both heavy and expensive. For most lenses the 4x5.65" filters will work just fine.

Does this fully answer the question? I have thought about making just suh a matrix of matteboxes for our website, but the options are so vast and we carry so many manufacturers. Plus there's dozens of tasks on my list to complete. So for now we have one for the models we rent. You can find it here:

http://www.abelcine.com/articles/in...rison&catid=50:equipment-comparison&Itemid=68
 
Mitch Gross said:
I have thought about making just suh a matrix of matteboxes for our website, but the options are so vast and we carry so many manufacturers. Plus there's dozens of tasks on my list to complete. So for now we have one for the models we rent. You can find it here:

http://www.abelcine.com/articles/in...rison&catid=50:equipment-comparison&Itemid=68
Click to expand...
This is very helpful, Mitch...thanks for the response and the link! I think that such a matrix (if you were to find time to do it) would be invaluable to those of us that don't have the opportunity to use a broad variety of these accessories on a regular basis. I know that as an educator, trying to make an informed decision on what to purchase for our program, I don't have the luxury of buying a number of different units...I have to pick the one that I think is the best fit for our students' needs and our (limited) equipment budget...and hopefully get it right the first time.
 
Yes, Mitch. Your answer is very comprehensive.

How about mattes? Do they come with mattebox when I purchase? How to use them, and when to use them?

Thank you very much.

Mitch Gross said:
A mattebox shades the lens from direct, hard light as well as holds filters. As most people generally have many lenses or find they need to change filters from shot to shot, it is must faster and efficient to have filters go into trays in the mattebox than to screw onto the front of the lenses.

A 4x5,65 filter is not physically tall enought to completely cover the large front element of a MP 150 or an MP 12. On the 150mm, the only part of the image that will be projected to the RED's sensor is through the center of the lens, so you will not see the filter tray or mattebox in the frame. Put it is stopping light from reaching part of the glass, so it is lowering the overall illumination level by a little bit. On the MP 12, the field of view is so wide that the mattebox itself will come into view.

If you want filters that will cover everything then you should consider using the MB28 with 6.6"x6.6" filters. But these are both heavy and expensive. For most lenses the 4x5.65" filters will work just fine.

Does this fully answer the question? I have thought about making just suh a matrix of matteboxes for our website, but the options are so vast and we carry so many manufacturers. Plus there's dozens of tasks on my list to complete. So for now we have one for the models we rent. You can find it here:

http://www.abelcine.com/articles/in...rison&catid=50:equipment-comparison&Itemid=68
Click to expand...
 
Thanks, Tom. I'll do what I can, but in the meantime you can always feel free to contact me directly to discuss the available options. Often a conversation about the use and needs for particular gear can be far more informative than a breakdown of specs. That's why my job title is Applications Specialist. It's about helping find what is most appropriate to your needs.
 
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