Large filter identification.

Danny Treacy

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Hi,

I came across these filters on the bay, as I need a 120mm filter for my LF lens when in the forest shooting, it's purely to protect the lens against potential scratches.

The seller had no idea as to the origin of the filters.

I think perhaps they are soviet but can't be sure. I don't know if they are for photographic or military use? It would be great to find out as if it's going to degrade the image then I won't use them.

The glass isn't coated, as you should be able to see from the image it's kind of greenish, like window glass.

So I guess my real concern is that would using the filter be detrimental to the final image??

There's a green filter too which, as I'll be shooting b&w in the forest, should be useful for lightening the foliage, again only if it's not going to degrade the final image.

Any info appreciated!

Thanks
 

jim10219

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If nothing else, being non coated could cause flare issues in the right light. And as a matter of physics, all filters degrade the image to some degree. Beyond that, your best bet is to try the same shot with, and without the clear filter and see if you can tell the difference.

I use cheap filters all of the time. None of the ones I've owned degrade the image (beyond possible flare issues) enough for me to notice. But I also don't use filters as lens protectors, and especially not on large format cameras. Those cameras are too big and bulky and difficult to focus to run around a forest and shoot things spontaneously as I see them. So I use lens caps to protect the lenses while moving, and don't mind the 0.2 seconds it takes to remove and replace them. Especially since it's gonna take several minutes to set up the tripod, compose the shot, meter the light, focus the ground glass, set the shutter and aperture, load the film holder...
 

AgX

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120mm... what is that for a size? Even Heliopan have not listed it. Or does your lens actually has another filter size, but that 120mm one comes cheap?
 

faberryman

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If it is only protection you are after, a lens cap might make more sense. Or, simply remove the filter before pressing the shutter and put it back on afterwards. I'm curious what lens LF lens take a 120mm filter.
 
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Danny Treacy

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AgX said:
120mm... what is that for a size? Even Heliopan have not listed it. Or does your lens actually has another filter size, but that 120mm one comes cheap?
Click to expand...

It's a Schneider 360mm 5:6 lens, pretty standard for 10x8 I think.
 
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Danny Treacy

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faberryman said:
If it is only protection you are after, a lens cap might make more sense. Or, simply remove the filter before pressing the shutter and put it back on afterwards. I'm curious what lens LF lens take a 120mm filter.
Click to expand...

Yes that's what I was thinking it would be good for rather than using a lens cap. 120mm thread is for my Schneider 360mm lens. The new filter fits this as I checked it.
 

E. von Hoegh

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Danny Treacy said:
It's a 6.8 I think rather than a 5.6, I'm in the pub now so can't quite recall.
Click to expand...
One of the reasons I use older lenses, filter prices seem to rise as the exponent of diameter. But these should work well for you, I have a set of 40.5mm Lytkarino (same make as yours) filters (FSU) and they are fine, also single coated.
 

AgX

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Danny Treacy said:
It's a Schneider 360mm 5:6 lens, pretty standard for 10x8 I think.
Click to expand...

I checked with my Schneider catalogs. That thread size vanished decades ago. That likely is the reason Heliopan do not list it.
 
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Danny Treacy

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AgX said:
I checked with my Schneider catalogs. That thread size vanished decades ago. That likely is the reason Heliopan do not list it.
Click to expand...

The lens was made in 1985, doesn't seem that long ago but maybe that's more a reflection of my age!
 

macfred

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AgX

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macfred said:
Fotoimpex has listed Heliopan filters in 100mm as a special order item - delivery time amounts to 5 to 10 days.
Not exactly cheap ...
Click to expand...

And who needs 100mm? The standard Heliopan sizes are 105, 107 and 127mm. Not cheap either.
 

Rudolf Karachun

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This is a Soviet time russian made filters. The first one or two letters indicated filter color. The last letter and numbers indicated type of glass it was made from. For example the ferst of you filters is yellow and made from glass type C10. This filter required 1 stop of additional expose. Another filter you have is yellow green 2 stops correction required, and the orange required 2.8 stops for a day light and 2 stops for a tungsten. The last colorless filter probably for some special effect, can't help you with that one. All information avealable on line www. Zenitcamera.Com but it is in Russian it may be hard for you to translate. Thank you.
 

Rudolf Karachun

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I'm sorry I made a mistake in my previous post. The numbers I gave you not a stops, it is a correction factors. The rest is correct.
 

Rudolf Karachun

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Another my mistake. The first filter witch looks like yellow on your picture, in reality not yellow. This is a UV filter. And it's correction factor of course 1. Now looks like I correct all of my mistakes.
 
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Danny Treacy

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Rudolf Karachun said:
Another my mistake. The first filter witch looks like yellow on your picture, in reality not yellow. This is a UV filter. And it's correction factor of course 1. Now looks like I correct all of my mistakes.
Click to expand...

Thanks for all the info!

Happy to hear that they are photographic filters. I think the UV and green filters will come in very useful for my work, the orange less so, no problem though as they cost only £12.50 in total.

Danny.
 
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