Thin Polarizer

[deans]

If I'm mounting a 17-40mm Canon lens on a 5D, do I need a thin polarizer to

prevent vignetting? If needed are there any of the thin polarizers with front

and back threads?

[deans]

Forgot to mention that I want to screw in a cokin p holder to the front of the polarizer for a gnd filter.

[erick_kyogoku]

I use a 17-40 on my 5D, using a regular B+W circular polarizer. Haven't seen any

vignetting on it.

[hugebob]

From what I understand, thins don't have front threading. They have to be the last filter screwed on. I'm in the same boat. I'm in the market for a polarizer for my Canon 16-35mm/5D setup. These puppies aren't cheap either (<a href="http://www.bhphotovideo.com/bnh/controller/home?A=ShowProduct&is=REG&Q=&O=&sku=181592">link</a>).

[JDMvW]

Do the thin filters have front screws?

 

The Cokin on the front is another matter. I would think that it would vignette with another filter before it on the lens. There is a thin version of the holder ( P Wide-Angle Holder (BPW-700) P299) for wide angle lenses that holds only one filter. Others have simply taken a hobby tool to the plastic holder and cut off the extra channels.

[tdigi]

That huge filter for the 16-35 is one of the reasons I am getting a 17-40. I didn't know

you need a thin filter for the 17-40

[peterlyons]

I have a 17-40 and a 5D, and with my Singh-Ray LB warming polarizer with the normal

ring, yes, it vignettes. You'll be okay with the thin mount. I have that one as well, and

it's required even on the 24-105, at or below about 28mm.

[peterlyons]

To answer those who asked, no, the thin mount filters do not have front threading.

That's precisely what makes them thin!

[howard_m]

a number of thin mount CPL filters have front threads.

 

The Nikon (!) CPL II definitely does and I use it regularly.

[colinsouthern]

Heliopan SH-PMC Slims have front threads. With any Filter attached to a WA lens on a FF camera you'll almost certainly get some vignetting if you start adding cokin/lee type filter holders.

 

You'll not find a bigger advocate of using UV filters for front element protection - but - this is one of the occasions where you'll probably want to remove it.

 

Cheers,

 

Colin

 

photo.net/photos/colinsouthern

[erick_kyogoku]

Colin, can the Heliopan SH-PMC Slim filter accept regular Canon lens caps? Would be

convenient if it did.

<p>

My B+W slim polarizer ships with its own rubber cap. Canon caps fall right off.

Thanks.

[colinsouthern]

"Colin, can the Heliopan SH-PMC Slim filter accept regular Canon lens caps?"

 

Yes - that's what I use.

 

Cheers,

 

Colin

[dogbert]

The Hoya digital Pro 1 HMC is also very thin but has front threads and accepts regular lens caps. I use it.

[erick_kyogoku]

Thanks Geoff and Colin for the feedback.

<p>

I suppose the Heliopan will replace my B+W when it gets dirty. I take it the Heliopan is

well built, made of brass, and handles like a B+W? (Must be as it's $212 rather than

the B+W's $165) But so far with my standard B+W Circ Polarizer I haven't had

vignetting problems on a 5D, at least not caused by the filter. (I've had vignetting from

the 24-105L at its widest, but even with no filter whatsoever)

[colinsouthern]

B+W & Heliopan are very much on-par quality wise. I understand that they both use Shott glass from Germany.

 

My experience with Heliopan is "top quality product, difficult supply lines" (well here in NZ anyway) - I've had to cancel an order a few months ago because it still hadn't shown up after about 3 months! I wouldn't hesitate to use B+W, but my understanding is that they don't produce a slim UV with front threads.

[hjoseph7]

"Colin, can the Heliopan SH-PMC Slim filter accept regular Canon lens caps?"

 

Yes - that's what I use.

 

I had problems trying to get any of my Canon lens caps to fit my Heliopan thin Polarizer filter, so I ordered a specially made one from B&H. I forgot what I paid for it.

[russsm]

I use Hoya SMC Pro-1 polarizers that have front threads for my lens cap or my Cokin P holder with Hitech GNDs. Note that Hoya makes a number of models/lines of filters. Only the Pro-1 is both thin rim AND has outside threads in the polarizers which are 5mm thick. Pro-1 UV/Haze are 3mm, but if the polarizer doesn't vignette at 5mm then save some money and get the UV/Haze in the SMC version (5mm) but otherwise having exactly the same features (coatings etc). Note that my research sometime ago showed the B&W MRC polarizers were 4mm thick and had front threads. I recommend Filter Connection (2filter.com) as a source for either.

[colinsouthern]

"I had problems trying to get any of my Canon lens caps to fit my Heliopan thin Polarizer filter, so I ordered a specially made one from B&H. I forgot what I paid for it."

 

 

Ahhh - double-drat. My stuff up. Somewhere along the way my brain substituted "UV Filter" for "CP Filter" - I was talking about the UV ones - sorry to all I put wrong.

 

I've got 77mm & 82mm Heliopan CP slims as well - and - alas - no front threads.

 

Cheers,

 

Colin