Filter size of Schneider Super-Symmar HM 120mm f5.6

Schneider-Kreunznach 120mm, f5.6 HM -

 

I recently purchased this lens on Ebay, and received it without any lens caps

or filters. I was hoping to purchase on line asap some lens covers and a

couple of filters, but could not be sure of the size. If you actually own one,

could you confirm for me the filter size, and the size of the rear lens for a

slip on cap? I communicated with a rep at Schneider who said the lens filter

size is 67mm, but it's definately not.

 

I already own a few 67mm filters for my 645 and they are obviously too big for

this lens. My guess is that it's about a 62mm, but I don't own calipers, live

in a small town with no large chain to go to to try on filters, and was hoping

to order one asap before certain spring conditions dissapear in my area. I

told the rep at Schneider, and he really couldn't tell me much other than it

doesn't match his "fact sheet". Thanks for any help given.

 

Dana

You should be able to buy a metric ruler at any hardware store for between $3 and $20. A plastic, dial caliper can cost as little as $30.

 

These are short-run lenses, which are subject to periodic changes. You have already found a discrepency, so why take a chance?

Thank you Edward

Dana, I do not own this lens but you might have better luck finding people who do own it if you re-posted in the Large Format Forum.

 

However looking at Schneider's own website the filter size is given as 67mm.

 

http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/super-symmar-hm/super_symmar_hm.pdf

 

The table is a bit confusing but under the Technical Data section is a column marked 'Accessory thread' and 'Thread 1'. For the 120/5.6 the thread is given as 67mm. The front cap diameter (d1) is given as 70mm and the back cap diameter (d2) as 54mm.

<p>The rep. is correct. My Super Symmar HM 120mm lens takes a 67mm filter. You might

ask on the <a href="http://www.largeformatphotography.info/forum/">large format

forum</a>. I hate to ask the obvious question, but could it be a Makro HM lens? If not,

I'm not familar with the history of this lens to know if there an older version with a smaller

filter size, Kerry Thalman's <a

href="http://www.thalmann.com/largeformat/future.htm">Web page</a> lists the lens

with a 67mm filter.

 

If worse comes to worse you can measure the inside diamater near the threads and

convert to mm, since filter come in step sizes, it will be a common size, either 58mm or

62mm, but nothing else.

...or is there a step-down ring fitted?

I own this lens (one of the sharpest LF lenses ever built in my opinion), and the Schneider rep. is correct. My lens takes 67mm filters.

If you measure the threads, realize that thread sizes are defined by the outside diameter of the male threads. On the lens, it will be easier to measure the inside diameter of the female filter threads, which will be smaller, so you need to round this value up a bit. Or eyeballing with a ruler, you can try to measure to the outside of the female threads.