Centuty .7 filter size ?

MrBirdBoy

MrBirdBoy

Well-known member
Hi everybody,
I have a .7 Century for my DVX. I use a matte box 95% of the time, but on the rare chance I am doing something reckless without it I'd like to have a UV or something to act as a safely. Korrey from Century on my 2nd email tried to offer me a matte box when I ask. So ... is there a reference to the front filter size anywhere ? I don't have B&H nearby to just go and check!!

Thanks in Advance,
Steve
 
The threads on the Century lenses are not filter threads. They're something used in the manufacturing process. It's doubtful that you'll find any filter that would work with those threads.
 
Hmphh.

I was hoping the was a way to screw on filters to the century 0,6x adapter.

Wideangle + polarization filter would be just great when doing outdoor shots...
 
Pukki said:
Hmphh.

I was hoping the was a way to screw on filters to the century 0,6x adapter.

Wideangle + polarization filter would be just great when doing outdoor shots...
Click to expand...


You may want to look at 4.5" drop in filters as a possible way to go.
A 95SSLR-4 1/2" adapter ring from Schneider Optics should fit your Century Lens (see http://www.schneideroptics.com/info/ads_&_brochures/pdf/!videosh.pdf for how those adapters work). The cost of brand new 4.5" filters is steep, but you can get them on eBay at a fraction of the cost. Also, you'd be able to screw a sunshade to the retaining ring to cut out flare.

Lutnik
 
Thanks Lutnik,
I always love it when I get 2 emails from the manufacture saying it can't be done and someone shows the answer USING something the company sells.

Hmmm .... Nice lens thou.

Steve
 
MrBirdBoy

The issue is not whether you can clamp on a 4 1/2 " round filter to the front of a .6x Century Wide Angle converter, but whether or not it will vignette (chop off the corners of the picture, especially in underscan.

This is the reason we do not recommend the combination.

You quickly reach a point at this size and even larger, that the cost of the filter holder and clear filter is greater than the cost of replacing the element if it is damaged, and the size (making the front so much larger) is also a problem for many.

I am sorry if you feel you did not get the information you were seeking.

Bill Turner
Schneider Optics
Century Division
 
Bill__Turner said:
MrBirdBoy

The issue is not whether you can clamp on a 4 1/2 " round filter to the front of a .6x Century Wide Angle converter, but whether or not it will vignette (chop off the corners of the picture, especially in underscan.
This is the reason we do not recommend the combination.
Click to expand...

OK, I assume we are talking about mechanical vignetting here.
So it's matteboxes vs round filters. Apparently, that make sense: a 4x4 filter has a 4" side but it's approx 5.65" across the diagonal so the integrity of the image corners would be preserved. But all the matteboxes I know have a round opening at the lens side! And I don't think there's any 4x4 mattebox on the market with a rear diameter larger than 110 cm (i.e. smaller than a 4 1/2 " round filter), In fact, some 4x4 matteboxes, such as Arri's, accept 4 1/2 " round filters at the rear of the filter stage. So, is there any technical reason why a 4 1/2 " round filter alone (which BTW is much larger than the front size of Century's .7 lens) should vignette where a 4x4 filter in a mattebox with an equal or possible smaller rear diameter would not?

Bill__Turner said:
You quickly reach a point at this size and even larger, that the cost of the filter holder and clear filter is greater than the cost of replacing the element if it is damaged, ...
Click to expand...

That's absolutely true (as I pointed out) unless you go hunting for filters on eBay or at used camera shop. As MrBirdBoy pointed out he would use those round filters rarely and mainly for protective reasons, so I guess he would be able spend less than 100$ overall (filter retainer + a couple of filters).

Bill__Turner said:
and the size (making the front so much larger) is also a problem for many.
Click to expand...

Still smaller than a mattebox if that is the alternative.
 
Last edited:
Dear Lutnik,

No argument here, but lets clarify, you wre asking about the .6x wide adapter and MrBirdBoy has a .7x wide converter.

The .6x is quite a bit wider, especially when you add in the increased barrel distortion.

If you tell me what camera (I would guess from the forum section DVX100 but need to be sure) I will check vignetting vs filter size etc and let you know.

One of the problems is that Matte Boxes and filter holders do not hold the filter right up against the lens, but introduce a space, then the shade or retaining ring in front may be the cause of the vignetting even if the filter by itself would not.

In any case I am more than happy to check and tell you what I find after I verify the accessory and camera.

Thank you for your patience

Bill Turner
Schneider Optics
Century Division
 
Hey everyone,

I think I anyhow got my answer. Thanks

All I wanted was a safety filter. I would pay $200 to cover my main wide angle on a gig. Sure, I can send it in for repair. 2 weeks later, after I piss off the client and break even, I'll have my lens back and still need a safety. Cow & the barndoor thing.

I don't want to make problems, I have a Chrosziel Wide-Angle 4x5.6 MB and to get the widest angle from the lens you don't get the last 3 filter slots, You only get the one I had machined into the sun shade (crafty, ah?) It’s like $1600.00
So if I used one of the 138mm flats / or Pol's I have in the little adapter, all is well.

I’ll order one from B&H today.


Steve
 
MrBirdBoy said:
Hey everyone,

I think I anyhow got my answer. Thanks

All I wanted was a safety filter. I would pay $200 to cover my main wide angle on a gig. Sure, I can send it in for repair. 2 weeks later, after I piss off the client and break even, I'll have my lens back and still need a safety. Cow & the barndoor thing.

I don't want to make problems, I have a Chrosziel Wide-Angle 4x5.6 MB and to get the widest angle from the lens you don't get the last 3 filter slots, You only get the one I had machined into the sun shade (crafty, ah?) It’s like $1600.00
So if I used one of the 138mm flats / or Pol's I have in the little adapter, all is well.

I’ll order one from B&H today.


Steve
Click to expand...

Hey, I didn't mean to argue or flame in any way. I apologies if I gave that impression. Bill is a really nice guy an I really appreciate his contributions to the community.

Back to your Century lens, there's another option available: have the inner barrel at the front of the lens machined to accept 95C screw in filters. The main advantages of this approach would be to keep the lens size consistent and make it easier to replace filters. Basing on the specs of the Century website the lens sizes should match a 95C filter, but a word from Century may help here.

Ciao

Lutnik
 
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