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03-20-2019, 09:36 PM   #1
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Filters for 6x7 55-100 MM Lens

This lens has become my all-time favorite.... I use it on my 645Z using a Pentax adapter. The images are simply amazing. However, there are situations where I need longer - much longer exposures - or where I need more control over the light in a scene. I am a professional so I can't use filters that are sub-par, however, I prefer not to spend more than I need to.

1. Will a generic 95 MM screw on filter fit?
2. Does anyone have experience with a rectangular filter system on this lens?
3. Does anyone have experience with Irix? Benro? Sirui?

I appreciate your help.

03-21-2019, 12:52 PM   #2

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Standard 95mm filters fit fine, I have also used a 100mm filter with a 95-100mm step up ring. I haven't used any of the square filters with a holder on this lens, I have simply held a ND filter in front of the lens for the duration of the exposure (not very often) and had no problems.
03-23-2019, 10:44 PM   #3

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Most of the 100mm square filter systems have a 95mm adapter, but I don’t know if the holder would block the lens at the wide end.
03-24-2019, 02:11 AM   #4
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I have used the 55-100mm f4.5 on my Pentax 67ii together with the Lee 100 filter system. Currently I use the standard 95mm adapter, with one filter in the holder, and this results in some modest vignetting in the widest parts of the zoom, maybe roughly from 55-65mm. This does not bother me, but if it did, there is also a better though more expensive Lee filter holder that fits this zoom:

LEE Filters 100mm Push-On Filter Holder FK100 B&H Photo Video

All this applies to the 6x7 film format. On your 645Z I would presume that the Lee 100 system and the standard 95mm adapter would work very well, and result in no vignetting. The best you could do was to take your 645Z and the 55-100/4.5 to a camera shop and check out how this filter system and other filters suit the equipment.

03-24-2019, 03:43 PM   #5

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I use this lens professionally as well and use the screw in types--- B+W 95mm KSM HTC-POL MRC, the 95mm Heliopan KR-3 warmer and a 95mm Hoya Polarizer ( for my 90-180 zoom).
03-24-2019, 05:13 PM   #6
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Original Poster
Thank you
03-24-2019, 07:59 PM   #7
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QuoteOriginally posted by nyghtfalcon Quote
I am a professional so I can't use filters that are sub-par, however, I prefer not to spend more than I need to.
First rule then is to avoid any and all resin filters and stick to quality glass — Hoya, B+W, Zéta, et al.Apart from their fragility, resin filters, despite their perceived versatility and ease of use, will also dramatically increase the risk of flare and ghosting unless you have, for example, a pricey accordion-style hood (e.g. Lee) and take active steps to mitigate interference. Then you have strong winds that are not exactly hospitable to the aforementioned accordion hoods. KIS.

Second rule is one of economics that forbids you from paying a little and getting a lot. Go for the jugular, and get the B+W 95mm KSM HTC-POL MRC mentioned by Desertscape in post #5. I have the same filter, but in 82mm (among other B+Ws). Just do not drop this or others of its ilk. This really is an investment in quality above else.

Benro and Sirui both have given problems (very serious in the case of Sirui's flimsy heads) with people I have professional affiliation with, and they have gone to Manfrotto as a result. None of us will look at anything Chinese-made priced at a value seemingly too good to be true. YMMV.

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