Depth of Field Adapter on Steroids

Eggplantt wrote:

fferreres wrote:

jogar wrote:

There are also f3.5 tessars. I have a 135mm and two 210mm (one coated, the other uncoated) Xenars.

I understand that f3.5 Tessar/Xenars are less sharp than the f4.5 ones, but they can make your setup quite a bit smaller, since you can project to a 5x7" screen.

Of course, if you happen to find a 300mm f3.5...

Talking about 300mm, I opted to experiment with the Rollei Heidosmat 300mm f3, and I still have not figured out how I will mount this beast. In fact, I have not found any information about this lens other than I suspect it's made by Franke & Heidecke and that it seems to be 4 groups (or elements?) of unknown design...dialite? I have found nothing on these lenses ever published other than it cost 1/4 of the Zeiss Rollei 250/5.6 according to catalog, and was to be used on P11 projectors when considering larger film.

I did not note how huge the lens was. It's a bloody melee weapon. Outer barrel is close to 3.5 inch and rear thread (can't yet assess the pitch, looks 1mm or longer) is 77mm. Consider the 4x5 board is 4x4 and 3.5 would leave 0.25 inches on the sides...or if I front mount, then 77mm leaves a bit more space, but I'd have to make the hole myself.

But this lens has a granddad too, the Rollei Heidosmat 400/4 by Franke & Heidecke:

https://www.ebay.co.uk/itm/264225964688?hash=item3d85184290:g:TcAAAOSwDxZbhDdg&amdata=enc%3AAQAHAAAAsFZYfl4nU89%2Bzvry7dJSeX6UfJ3Q72arlH86ni8XqkH5Y4QoXJRCiEPxIpp6sCFCjsx7MwzanAvy6fut8T5FzjCw6sTbR0dgdAh0AFZi%2BjZ%2FUj3vDe6tifoTz%2BbeEr9iumiJdF5eV%2BzrdSB674EqJCFKTzzOMVQgTvz879nlzp5vd7Sy3MVIIt%2FZoXNzA%2F%2B3LGD8h3PHjl4%2FS2Dyn69DfC8qL6FImOfqdmQ9TlRzRuBE%7Ctkp%3ABk9SR5ihtNPaYA

Now that's a huge chunk of a 4-element lens. At 400mm, it may have a lot of coverage, as the 300mm almost covers 8x10 at infinity. In 8x10 it'd look like f0.47 or something like that if I am not mistaken.

The linked 400mm Heidosmat has an element at the end of the long tube, so I am doubtful it will do 4x5- probably a typical long focal length Sonnar design.

That doesn't mean the other Heidosmat lenses are like this. Far from it- in 35mm projection lens catalogues I have seen 4 element large format lenses placed in-between 8 element, narrower angle of view designs.

There's the TV Heidosmat or something like that which is mostly 35mm and it has a Sonnar design with I think 8 elements. It's the 135/2.8 one iirc. There's the medium format 135/2.8 ( I think S-Heidosmat, to tell it apart from the normal 3.5 one) that seems to be a Xenotar design. The 300/3 seems like a barrel lens, and I am still unsure if it's 4/4 but I suspect it is. It's hard to assess, I did some photos of ground glass and that's as far as I got. To use it in 4x5 I need to either remove the rear alu tube, but then it's a very unbalanced lens and will have more flares, or I could shorten it....my dremel is in the way. It's too long for the focal length.

The DOF is brutal short, but in 8x10 would look more devastating. I have yet to observe it's PSF or blur images. That's would tell me a lot.