Pentaxian Registered: March, 2007 Location: Greater Copenhagen Area Posts: 430
1 user found this helpful
| | Review Date: April 24, 2020 | Recommended | Price: None indicated
| Rating: 10 |
| Pros: | Clip on type, fits normal filter threads - also other brands than Pentax (the latter two) | | Cons: | The big one (100mm) only fits Takumar 6x7 lenses with corresponding filter size, e.g. the old 55mm F3.5 | |
There are other filter holders than the one shown above. I have the Asahi Pentax Gelatin Filter Frame for lenses with 100mm filter size. This only fits 6x7 Takumar lenses compatible with the Pentax 6x7 bayonet filter system. Filters are slid in from the side.
Then there is the Asahi Pentax Gelatine Filter Holder 67mm
and the Asahi Pentax Gelatine Filter Holder 58mm
The latter two are of the clip on type and fit the corresponding generic 67mm and 58mm filter threads. These are easy to open, insert filter and clip shut.
Top quality and ease of use.
All these gelatine filter frames/holders are made for 75 x 75 mm filters like the Kodak Wratten Gelatin Filters.
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Site Supporter Registered: October, 2008 Location: Vancouver, Canada Posts: 8,091
1 user found this helpful
| | Review Date: December 26, 2016 | Recommended | Price: None indicated
| Rating: 7 |
| Pros: | Saves on filter costs. | | Cons: | Limited useage and gel filters are delicate to use. | |
Pentax made three 6x7 Gelatin Filter Frames/Holders in 67mm, 82mm & 100mm sizes. These are an old accessory from the early days of the 6x7 system and use the bayonet filter mount to attach to the front of the lens. You can mount either a screw-in, bayonet or clip-on lens hood to the front of the filter frame/holder, or a second filter or a lens cap.
The filter frame/holder accepts 75mm x 75mm (3 x 3 inches) gelatin filters, which you slide into the slot in the top of the mounted fame/holder.
Kodak Wratten 2 Optical Filters work perfectly and there are a wide range of choices:
Kodak Wratten 2 Optical Filters
The problem with these frames/holders is that over the years Pentax moved away from the bayonet filter system to the standard screw-in type. A lot of the last generation Pentax 67 lens dropped the bayonet filter thread and were screw-in only.
As a results you are limited to using the three frames/holders to the following lenses:
45/4 all versions (82mm)
55/3.5 all versions (100mm)
75/4.5 all versions (82mm)
75/4.5 Shift all versions (82mm)
90/2.8 all versions (67mm)
105/2.4 all versions (67mm)
135/4 Macro all versions (67mm)
150/2.8 all versions (67mm)
165/2.8 all versions (67mm)
200/4 early Takumar versions only (67mm)
The non ED 300/4 lenses (82mm) will accept the frame/holder but you will not be able to extend the built-in lens hood unless you cut the square corners off the gel filters. 
These gelatin filter frames/holders were not a bad idea back in the day, but are pretty obsolete now. They would have been a lot more useful if they were screw-in and there were also versions in 77mm & 95mm. That way you could use them on almost all the Pentax 6x7 lenses as well as some 35mm format lenses.
Pentax also made clip-on gelatin filter frames/holders for 35mm format lenses in 67mm & 77mm sizes, that you can also use on 6x7 lenses:
https://www.pentaxforums.com/accessoryreviews/pentax-gelatin-filter-holder.html | |
Senior Member Registered: November, 2014 Location: Temple PA Posts: 107 | | Review Date: March 27, 2016 | Recommended | Price: None indicated
| Rating: 10 |
| Pros: | Inexpensive gels for creative effects. | | Cons: | Pro Gelatin 75 X 75mm special order | |
Adapter fits only 6X7 bayonet lenses. Bay hoods mount to holder or you can use 67mm screw in hoods. Pro Gel filters give consistent results over glass filters although they are very fragile. Holder accepts 75 X75mm gels.
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