View Full Version : Center filter thread question
I recenly acquired a Heliopan center filter for my 75mm Caltar lens. It's got a 67mm inner ring size to fit the lens, and is 86mm on the other side.
I am looking at getting a Cokin 100mm (4") ND Grad set, and there are two kinds of filter ring adapters for 86mm filter sizes: Coarse thread (1mm) and medium thread (.75mm). They're about $50. each or I'd just buy both and figure it out. Does anyone know how to tell?
// Wally
Bob Gentile
30-Dec-2007, 11:50
IIRC, Heliopan filters are either .5 or .75mm. I don't believe they make a filter with a 1mm thread.
But Bob Saloman would know for sure.
Bob Salomon
30-Dec-2007, 12:23
86 x 1
86 x 1
Cokin has two screw-on X-Pro 100mm filter adapters for 86mm. The CX486A has a .75mm thread and the CX486B has a 1mm thread. Is this simply indicating the length of the threaded portion of the end that screws onto the lens? It sounds like I should be looking for the one with the shortest threads to ensure I don't vignette with my 75mm wide angle lens, right?
Bob Salomon
30-Dec-2007, 13:23
Cokin has two screw-on X-Pro 100mm filter adapters for 86mm. The CX486A has a .75mm thread and the CX486B has a 1mm thread. Is this simply indicating the length of the threaded portion of the end that screws onto the lens? It sounds like I should be looking for the one with the shortest threads to ensure I don't vignette with my 75mm wide angle lens, right?
It is the thread pitch. You simply want the standard 86mm thread. They will know what it is.
It is the thread pitch. You simply want the standard 86mm thread. They will know what it is.
Too bad I didn't understand what you meant when you replied "86 x 1". I assume now you were telling me 86mm with a 1mm thread pitch.
Well, B&H sales took me to what sounded like Jakarta. The first fellow I spoke with thought the catalog listing of two adapters of the same diameter was a mistake. I asked to speak to his supervisor. His supervisor assured me that it was a thickness thing, and since I was attaching this to a wide-angle lens, I wanted the thin one, so I should order the .75mm.
I couldn't see how a difference in thickness of just a quarter of a millimeter could be the difference between these two adapters, so I called Adorama, where someone that sounded quite confident said it was indeed a thread pitch, and he thought I needed the .75mm pitch.
Well, the 86mm Cokin X-PRO adapter with the .75mm thread pitch arrived, and surprise! It's the wrong one. Apparently my Heliopan 67/86mm center filter uses the 1mm-per-thread pitch, and now I wait for Adorama to answer my email requests for an RMA number and shipping tag.
I should have asked where you people shop and not relied on google to lead me to the photography store choices of the masses.
Bob Salomon
10-Jan-2008, 06:44
Too bad I didn't understand what you meant when you replied "86 x 1". I assume now you were telling me 86mm with a 1mm thread pitch.
Well, B&H sales took me to what sounded like Jakarta. The first fellow I spoke with thought the catalog listing of two adapters of the same diameter was a mistake. I asked to speak to his supervisor. His supervisor assured me that it was a thickness thing, and since I was attaching this to a wide-angle lens, I wanted the thin one, so I should order the .75mm.
I couldn't see how a difference in thickness of just a quarter of a millimeter could be the difference between these two adapters, so I called Adorama, where someone that sounded quite confident said it was indeed a thread pitch, and he thought I needed the .75mm pitch.
Well, the 86mm Cokin X-PRO adapter with the .75mm thread pitch arrived, and surprise! It's the wrong one. Apparently my Heliopan 67/86mm center filter uses the 1mm-per-thread pitch, and now I wait for Adorama to answer my email requests for an RMA number and shipping tag.
I should have asked where you people shop and not relied on google to lead me to the photography store choices of the masses.
I told you it was 86 x 1. That is the diameter of the threads (86) and the thread pitch (1) IT HAS NOTHING TO DO WITH THE THICKNESS OF THE FILTER. ORDER A HOLDER THAT YOU LIKE WITH MALE 86 X1 THREADS AND STOP ASKING OTHER questions to confuse the issue,
I told you it was 86 x 1. That is the diameter of the threads (86) and the thread pitch (1) IT HAS NOTHING TO DO WITH THE THICKNESS OF THE FILTER. ORDER A HOLDER THAT YOU LIKE WITH MALE 86 X1 THREADS AND STOP ASKING OTHER questions to confuse the issue,
Thanks for the advice. As I said, I'm sorry I didn't see that you were telling me the thread pitch I needed. It's my fault and I'll try not to do it again.
By the way, what other questions did I ask that confused the issue?
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