Single 4x4 (100mm) filter holder that attaches to the front of a regular filter

John_TX wrote in post #8460713
I ran across this at B&H today while looking into the Lee 4x4 (100mm) filter holders: I really just need something to hold one 4x4/4x5 filter in front of the lens.

http://www.bhphotovide​o.com …rass_Filter.htm​l#features

• Heliopan 706107 Heliopan Rotating Filter Holder 105MM.
  
• The 105mm Heliopan rotating filter holder is made from brass and has a matte black finish.
  
• It is intended to be used with Heliopan rectangular 4'' wide (100mm) glass filters up to 4mm thick.
  
• It is threaded in the front to accept additional filters, lens hoods or to combine multiple holders for special effects.
  
• It combines the ability to both rotate and alter the position of graduated filters.

I've been looking for an inexpensive way to use one 4x4/4x5 filter with a polarizer, but unfortunately, this is turning out to be a rather expensive endeavor!
- $75 Lee Foundation Kit
- $60 Lee Wide Angle Adapter Ring
- $52 Lee Accessory Front Thread Adapter Ring (105mm)
- $219 B&W CPL
- $125 for two Hitech soft GND (0.6 & 0.9) 4x5 filters
----------
$531

The Heliopan rotating filter holder (above) that attaches directly to the front threads of your filter seems perfect...but what the hell is up with the cost? $400 bucks for a 105mm ring that simply rotates??? These guys are nuts!

Besides the $400 cost, this seems like the perfect way to put a 4x5 filter in front of a 77mm polarizer already attached to your lens. It appears that you would only need the Heliopan rotating filter holder and a 77-105 step-up ring. This would allow you to use all of your preexisting 77mm filters along side any of the 4x5 filters.

Does anyone know if someone else makes a similar setup? Hell, I don't care if it's a durable plastic. $400 seems really extreme when you could buy a 105mm CPL, knock out the glass, and attach some clips to the front to hold the 4x5 filters...all for way less than $400 and it would still rotate independently of the CPL attached to the lens.

NYPhotog wrote in post #8462900
Like everything else that Heliopan sells, it expensive beyond reason. BTW, the only company that has a 77-105mm step-up is, you guessed it, Heliopan and it costs $67.