As per the responses you've already received on Reddit, you need to factor in the maximum bellows extension your camera offers. On Reddit you stated you use a Graflex Super Speed Graphic. This is relevant to include in your question.
A camera with more limited bellows extension makes tele designs more attractive. On the other hand, they do sometimes come with a penalty w.r.t. optical quality, and their image circles are much smaller than non-tele designs of the same focal length. I personally have a Tele Arton (the 360 IIRC), but in all honesty I consider it a weak performer. Checking the specs on the 250 Tele Arton, it officially does not cover 4x5". I'm not familiar with any 'tele arton 270'. Does it exist?
I also have a Symmar-S 300/5.6 which is a great lens optically, but it may be relatively heavy for your camera. I'm not familiar with the Graflex camera, but some cameras can become a little wobbly with a heavy lens on the front stand.
The Symmar-S 210/5.6 is a great lens (I have one of those as well) also on 4x5", but it's not particularly long. It doesn't feel quite as long as the 80-100mm lens on a 35mm camera that you refer to as a benchmark. Then again, you can do marvelous portraits with it - provided the model sits still enough.
This indeed is very nicely lightweight, has good (excellent) coverage and can often be found at an attractive price even sometimes mounted in a shutter. Its only real drawback is that the image is rather dim at f/9.the 240/9 G-Claron
So it evidently exists! I'm not familiar with it, but if it performs anything like the 360 I have, I wouldn't recommend it. And if the design is similar to the 250 I found the specs of, the coverage will barely be sufficient for 4x5", which would make me hesitate as well.The 270mm tele arton i found is this one:
It could be relevant to ask what type of portraits. If soft and pleasant focus is more important than detail the answer could change a bit. For example the single element Wollaston landscape lens has been extensively used for soft portraits, as have the Petzvals.
If you make a Wollaston landscape lens out of a $10 77mm +10 diopter, it can cover 4x5, and close to 8x10. It's a bit of work, you have to mount it in a tube, and then the aperture and shutter goes in front of the lens. I'm working on one currently for medium format. But I'm no mechanical genius and have managed it just fine. Working aperture is in the ~f/5.6 range and with only one element it's quite light. It would not be a long lens on 4x5 if you used a +10. Closer to normal lens. You'd want a +3 diopter for 300mm.
Just a DIY idea, I know it isn't for everyone.
I would like to have a sharp lens, as if I want is soft I can just add a filter.
I don’t really have good access to stuff for making a diy lens. That why I want to buy most stuff now and have it shipped all in one.
I've always found It best to buy gear when it becomes available at the price and in the condition that you're after.
If it helps, there are no right or wrong or good or bad focal lengths, so just pick up what you can, when you can, give it a go and enjoy it.
Of the lenses mentioned I would start with the Schneider Symmar 240 F5.6 for your camera.
Since you are asking about portraits, a lot of people like less sharp lenses, and there are many, such as the Fujinar and Fujinon series in 210mm, 240mm, and 300mm -- usually f4.5.
Then there are the various SF lenses from Fuji, Rodenstock and others.
Then there are the DIY portrait lenses made from Close-up lenses -- usually attached to a Copal #3 shutter.
@Capan Check the bellows draw on your camera. It could make anything around 300mm to be, ummm, a challenge. Unless it’s a tele lens.
I don’t want to be “that guy”, but for serious portraiture you might want to investigate a different camera.
The manual says it can use a 15 inch lens
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