Kodak Retina 1b vignette?

[Laci Toth]

Hi all,

I just swapped a Kodak Retina 1b and love it.
Would like to give Rollei Infrared a go and will use two rings to be able to use ir72 filter. As I need two step rings one 49-37 and the other 37-29.5, I’m wondering if I’ll face with vignetting problems or not?

 

[bernard_L]

You can find out for yourself without even using film. Mount the two step rings and a clear (UV, haze) 49mm filter. Open back. Open shutter on B setting, diaphragm fully open. Facing a uniform surface (sky, wall), peek from the back, line of eyesight near each corner of the film gate; Can you see a darkening from the edge of the filter ring?

 

[Helge]

Hi all,

I just swapped a Kodak Retina 1b and love it.
Would like to give Rollei Infrared a go and will use two rings to be able to use ir72 filter. As I need two step rings one 49-37 and the other 37-29.5, I’m wondering if I’ll face with vignetting problems or not?

Here’s what i did:
Get a plain glass filter holder for 29.5 filters, with the possibility of screwing in a shade. Like the Omag ones.

You really really need a shade for IR.

Get a Zomei 720nm 30.5mm https://www.ebay.com/itm/174348617441

It’s absolutely as good as the Hoya.
I have tested.
If it does let a smidgen (not that I can detect it) more visible light through, it’s only good with this film to lower the contrast a tiny amount and give the shadows a bit more information.

Take out the front ring of the filter. Flip the glass out onto a napkin, and held by the edges insert into the holder.
It should fit perfectly.

 

[Laci Toth]

You can find out for yourself without even using film. Mount the two step rings and a clear (UV, haze) 49mm filter. Open back. Open shutter on B setting, diaphragm fully open. Facing a uniform surface (sky, wall), peek from the back, line of eyesight near each corner of the film gate; Can you see a darkening from the edge of the filter ring?

Good idea! Thank you!

 

[Laci Toth]

Here’s what i did:
Get a plain glass filter holder for 29.5 filters, with the possibility of screwing in a shade. Like the Omag ones.

You really really need a shade for IR.

Get a Zomei 720nm 30.5mm https://www.ebay.com/itm/174348617441

It’s absolutely as good as the Hoya.
I have tested.
If it does let a smidgen (not that I can detect it) more visible light through, it’s only good with this film to lower the contrast a tiny amount and give the shadows a bit more information.

Take out the front ring of the filter. Flip the glass out onto a napkin, and held by the edges insert into the holder.
It should fit perfectly.
View attachment 269081

I don’t know if I understand how to do this.
So first I need a 29.5mm filter holder. I then screw this in the front of the lens. Then I need a 30.5mm ir filter which will fit in this holder. How can I take this ir filter out from the ring? Is there a tool or any tricks how to take that out?
If I succeed I then screw in a lens hood in the filter holder with the ir filter between the filter holder and the lens hood?

 

[Helge]

I don’t know if I understand how to do this.
So first I need a 29.5mm filter holder. I then screw this in the front of the lens. Then I need a 30.5mm ir filter which will fit in this holder. How can I take this ir filter out from the ring? Is there a tool or any tricks how to take that out?
If I succeed I then screw in a lens hood in the filter holder with the ir filter between the filter holder and the lens hood?

Exactly.
The glass on most filters, including this one is easily removable with a slide caliber (buy a cheap plastic one for this job) or lens spanner tool, put into the notches, on either side of the retaining ring.
You can even use pointy scissors if you have a steady hand and are not planning on using the filter ring.

Edit. Sorry, just saw that it’s a 27 filter holder I have. It will not work for you on a Ib.
Your best bet is to get a 29.5 to 37mm converter for the Zomei filter, and then a push on shade.
I’m not even completely sure a larger filter will fit within the folding bed. Under any circumstance it will look and work better with a smaller filter.

 

[Laci Toth]

Exactly.
The glass on most filters, including this one is easily removable with a slide caliber (buy a cheap plastic one for this job) or lens spanner tool, put into the notches, on either side of the retaining ring.
You can even use pointy scissors if you have a steady hand and are not planning on using the filter ring.

Edit. Sorry, just saw that it’s a 27 filter holder I have. It will not work for you on a Ib.
Your best bet is to get a 29.5 to 37mm converter for the Zomei filter, and then a push on shade.
I’m not even completely sure a larger filter will fit within the folding bed. Under any circumstance it will look and work better with a smaller filter.

Okay. I’ll see what I can do. Thanks for the suggestion!