Idea for solving missing ND problem.

cheezweezl said:
i was just thinking about cutting a slot in the top of the adapter, along with building some structure on the inside, that would allow a standard round ND filter to be dropped in. I'm thinking something like 52-58mm off the top of my head. then i could have like a 3 filter set in a pouch, in my pocket, that i could just drop in an anytime. this would actually give me a little more flexibility over the F3, which has only two ND filters.
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I would worry about light leaks and debris on the chip. It would be handy if it worked.
 
Hmmm.....

ATiK Manual Filter Wheel

atikfilterwheelsmall.jpg


The Atik manual filter wheel allows you to switch between 5 x 1.25" filters without removing the camera. At the same time the filters are always safely stored and protected against dew. This filter wheel is well suited to both imaging and visual use (with optional visual back) and is the most robust low profile filter wheel available at this price level. The wheel has female T threads at both ends with a 1.25" nosepiece and a lockable & rotateable male T thread adapter.
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http://www.modernastronomy.com/filters.html
 
imag said:
I would worry about light leaks and debris on the chip. It would be handy if it worked.
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yeah, that concerns me too. it would have to be something pretty solid. i think i'm getting too complicated here. i'm going back to my original idea of mounting threads inside so i can screw in whatever strength of nd i want. i figure i can pop on a lens at the stop i want. then see how many stops down it takes to get to the exposure i want, then pop in whatever ND knocks down the same number of stops. then i'm set, even with lens changes as long as my stop and the light stays the same. or for instance, if i'm gonna go out and shoot a bunch of sunny day b-roll, i could just throw in say a ND 1.8 and go pretty much all day with it.
 
cheezweezl said:
yeah, that concerns me too. it would have to be something pretty solid. i think i'm getting too complicated here. i'm going back to my original idea of mounting threads inside so i can screw in whatever strength of nd i want. i figure i can pop on a lens at the stop i want. then see how many stops down it takes to get to the exposure i want, then pop in whatever ND knocks down the same number of stops. then i'm set, even with lens changes as long as my stop and the light stays the same. or for instance, if i'm gonna go out and shoot a bunch of sunny day b-roll, i could just throw in say a ND 1.8 and go pretty much all day with it.
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That makes much more sense to me. I think the swapping or add-on filter wheel can only work with a fully engineered product. I wouldn't be surprised if some adapter company decided to build an adapter/wheel combo...
 
Finally made it to the camera store today. After trying many sizes, I found that a 46mm filter is a perfect fit inside the fotodiox e/eos adapter. I got a plain UV filter from which I removed the glass. I'm mounting the ring inside the adapter now. I just ordered a couple of 46mm tiffen nd's from amazon. They will be here on Friday and hopefully my fs100 will be too. Will report back with results.
 
Yep. That's why a filter wheel behind the lens also has a position for an optical clear element -- to keep the optics the same. If you look at a lens that uses rear-mounted filters (such as the Peleng 8mm) you'll see that they always include a clear filter too, for that purpose.
 
ahhhh... gotcha. thanks guys for that bit of info. i swear i never stop learning from this site.

hopefully, it won't be a big deal. i wasn't expecting this non-adjustable mount to be 100% accurate anyway. plus i'm using mostly canon L glass. so the focus rings aren't fixed. which would make it tough to focus by witness marks. my strategy is to use peaking and go by eyeball. so as long as this filter thing doesn't hose me on hitting infinity, i think i'll be ok. if it does, then it's back to the drawing board...
 
I think they are pointing out that this is a back focus issue - not adjustable with lens focusing. You would need to change the thickness of your adapter to accommodate the issue.
 
imag said:
I think they are pointing out that this is a back focus issue - not adjustable with lens focusing. You would need to change the thickness of your adapter to accommodate the issue.
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i realize that. when i said "adjustable" i meant that there is no back focus or collimation adjustment. i don't expect this fotodiox lens adapter to be 100% accurate as far as flange depth/back focus/collimation goes, before i did anything to it. hopefully my ND idea doesn't mess me up so that i can't hit infinity. otherwise, i don't care if the witness marks are accurate.
 
So I am doing something similar, I am mounting two polarizers in my second adapter and am creating an area to adjust one of them. So basically, a faderND inside the mount. :)
 
here's a pic of mine with the filter ring installed. i used some gorilla glue to mount it. pretty solid. my ND's don't come in until tomorrow. i will report back as to how easy it is to screw them in, etc. i will be getting my FS100 tomorrow as well so i will test this thing out and see what happens.

fi5zym
 
Okay, same mount as me. I too got the filter rings, but I am going to mount the rainbowimaging 52mm (hopefully) in the larger part of the adapter. Given our projects are so similar and I am using your idea of the filter ring to attach (and I will get some gorilla glue) I will post my results in here as well.

One thing I do need to find is at least a crappy color chart (I don't want to spend on a pricy one yet) so I can shoot at different focal lengths to see what I get.
 
If you are ever shooting with diffusion, soft fx, promist, smoque or any other filter you will want it stacked between the ND and the lens
 
J Davis said:
If you are ever shooting with diffusion, soft fx, promist, smoque or any other filter you will want it stacked between the ND and the lens
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lol. i was already thinking of a way to attach some white and black pantyhose to a filter ring...
 
SIDEBAR: hey rick, are you mounting your camera on rods? if so, have you figured out a way to attach this adapter to the rods via the little 14"/20 mount? i use my 70-200L all the time and it is a heavy monster. i don't want to let the camera take all that weight. i'm not sure what the clearance above the rods will be but i think it's gonna be short. gotta find some sort of support. maybe zacuto makes something.
 
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