Filter Question

[Soul Rebel]

My dad picked up 3 filters by Hoya from a garage sale today. They dont say what they are but along the side they say HOYA 58 and an oval with a check through it and the three are numbered +1, +2 and +3.

What are they?

 

[omeletteman]

I would guess maybe Neutral density filters? the 58 is the thread size.

 

[Soocom1]

What the +1,+2,+3 means is the magnification capability of the filters.
There are many that are also -1,-2,-3, etc. They were originally designed for fixed lens cameras of old that couldn't zoom in or out on a subject.
Sort of like a macro lens on the cheap. The 58 is the diameter size of the filter itself, and if they doesn't have any threads anywhere on it, they may be a Series 9 filter made for cameras from the 1970's.

 

[Soul Rebel]

Thanks.

I forgot to actually check to see if the filters would fit

 

[Torus34]

First, are they filters [not clear colorless glass] or lenses [clear colorless glass]?

 

[Hertz van Rental]

They will be diopter macro lenses.
Nothing else has +1 etc.
http://www.2filter.com/prices/Macro_Close-up_lenses.html

 

[mentos_007]

macro lenses probably