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Peleng 8mm and ND

M

Mike Yonts

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Hi,

I have one of these great little fisheye lenses with a PL mount, and I've been wondering what people are doing for an ND filter. Obviously if somebody makes an neutral density version of those tiny filters that screw on the back of the lens, that could be a great solution. But I haven't seen anything like that anywhere.
 
There was an earlier post regarding your situation. I sent in one of the filters to someone on this board and had it replaced with a .6 ND. I'll try and find the link and post it up here soon.
 
I picked up a second set of the small filters on ebay. I was able to create an ND.6 out of one of the filters. I haven't located other densities to use in the right thickness of glass.
 
Some posts in the other thread made it sound like Douglas Underdahl was making them, but apparently that's not the case.

Jeff, how did you do yours? I wouldn't know where to get the glass, or how to cut it into a little circle.
 
Matthew Duclos said:
Just a little tidbit...
If you are planning on filtering your lens from the rear, expect your marks to be off.
Not sure it will matter much since this lens is so wide.
Click to expand...

Wouldn't inaccurate FFD on an 8mm b a huge issue?
 
The Peleng 8mm comes with a clear glass to install at the rear for when other filters are not being used. This way the marks remain consistent. Just like using drop-in filters in lenses that take them. It's typically best to have a clear in there if not using any filtration.

I've found that the screw-on mounts for the Peleng need to be checked for collimation every now and then. They tend to wiggle around or move and are only held into place by a couple set screws. So in that respect, inaccurate FFD does come into play. It is a huge issue with this lens... In my experience, if it's off, then the lens is just out of focus throughout the entire focus range. The focus throw on this lens is so short and at 8mm, it spends most of its time set to infinity or real close anyway. The next witness mark in from infinity on this lens is about 16ft. IIRC...
 
The Peleng focus scale is set up to be used with a rear filter, 1mm thick, at all times. If you pull the filter, then you can actually focus closer, but the lens won't reach infinity. I have made filters for the Peleng, but it's just not economical anymore. You can cut gel filters and put them in the Peleng holders, however. Just make sure that you check your focus on the RED. It's quite simply the widest 35mm movie lens you can use (maybe there is a 7.5mm Canon . . ) so it's the most susceptible to flange focal distance errors. Good thing we can all use the 1:1 focus check on our RED cams and test for focus in real time. It was much scarier when I was selling these for film shooters.
 
Stephen Williams said:
Wouldn't inaccurate FFD on an 8mm b a huge issue?
Click to expand...

Yes and no... Back focus on such a wide lens is very sensitive and more critical than a telephoto lens. However, because its so wide, the depth of field is so deep. The back focus error is masked by a deep depth of field.
 
Douglas Underdahl said:
It's quite simply the widest 35mm movie lens you can use (maybe there is a 7.5mm Canon . .
Click to expand...

Sigma makes a 4.5mm circular fisheye for APS-C cameras in Canon and NIkon mounts
 
The filters are just pressed in. Just push them out of the holders with your thumb. Remove the holder from the back of the lens and push the filter out of it from the lens side. I have a couple hundred of them in a box somewhere, green and orange (not 85) and clear.

Wow, there's a Sigma 4.5mm that covers the RED sensor and also APS-C? Or does it give you a circular image? Could be a cool effect for that door peep hole shot, or maybe for dome projections (Evin was doing this with the Peleng and an interesting rig).
 
It's cool to see that cinema people also use the 8mm Peleng, I've used it in m42 thread mount on my old Zenit ET to shoot still frames - craaazy lens. What I actually wanted to ask, is that I don't have that lens personally(a friend does) but I do have a 16mm Zenitar Fisheeye, and it also uses these rear-screw-in tiny filters (m26*0.5 thread). The lens came brand new with three filters(a yellow, a green and a red, all meant for b&W or infrared shooting), but would it be possible to somehow put a polarizer in there?
 
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