Any Lenses for 14 X 36"?

[xkaes]

I also like Pinhole focus as none is needed!

Pinholes have great DOF, but it's not infinite. There still is a point of focus -- just like any lens stopped way down. You can compute that distance based on the size of the hole:

Here are two websites to help you calculate the f-stop of your pin-hole(s) and the focal length(s) that will produce the optimal (i.e., sharpest) results:

http://www.mrpinhole.com/index.php

http://pinhole.stanford.edu/pinholemath.htm

[Tin Can]

I am a constant user of Mr Pinhole

Stanford is a dead link

Thank you

Pinholes have great DOF, but it's not infinite. There still is a point of focus -- just like any lens stopped way down. You can compute that distance based on the size of the hole:

Here are two websites to help you calculate the f-stop of your pin-hole(s) and the focal length(s) that will produce the optimal (i.e., sharpest) results:

http://www.mrpinhole.com/index.php

http://pinhole.stanford.edu/pinholemath.htm

[xkaes]

Here's the STANFORD PINHOLE page from the WAYBACK machine. I guess the student graduated:

https://web.archive.org/web/20180809...inholemath.htm

[Tin Can]

xkaes,

Very good data I have found nowhere else

I know modern 'real' f-stops end at f256

I need a chart with ALL real and imaginary f-stops in current practice

or when does doubling begin and end?

Thank you!

ps: I do understand https://www.ilfordphoto.com/wp/wp-co...mpensation.pdf

Here's the STANFORD PINHOLE page from the WAYBACK machine. I guess the student graduated:

https://web.archive.org/web/20180809...inholemath.htm

[Tin Can]

Here it is, I missed on my ipad

https://web.archive.org/web/20180716...edu/ip-fn.html

[xkaes]

xkaes,

Very good data I have found nowhere else

I know modern 'real' f-stops end at f256

I need a chart with ALL real and imaginary f-stops in current practice

or when does doubling begin and end?

Thank you!

ps: I do understand https://www.ilfordphoto.com/wp/wp-co...mpensation.pdf

Here is the f-stop breakdown starting at f16:

f16 - f22 - f32 - f45 - f64 - f90 - f125 - f180 - f250 - f360 - f500 - f720

For other intermediate f-stops, such as starting with f18, just multiply by the square root of 2.

My pinholes are:

75mm (AKA 75mm) f224
88mm (AKA 90mm) f231
118mm (AKA 120mm) f291
151mm (AKA 150mm) f329
185mm (AKA 180mm) f364
234mm (AKA 235mm) f409
289mm (AKA 300mm) f455

[Jody_S]

I think you already have your ideal lenses, a pinhole and the Wollaston meniscus, but Goerz did make the early Double Anastigmat Ser. III up to 35" focal length (later 16.5" as the Dagor). I've never seen or heard of one longer than 24" (not that I was looking), and I imagine they would go for a sizeable price no matter the condition. Also, the Dagor is convertible, so you could use the rear half and diaphragm to get a 'normal' focal length for that format.

The Series IV Dagor was made up to 47" focal length, and there is currently a 47" example for sale on fleabay ($25K).

[Tin Can]

Thanks Jody, not buying anymore lenses no matter how expensive!

I use a Nikkor 610 f9 often on my studio 11X14

This Nikon Datasheet is interesting http://www.savazzi.net/download/manuals/Apo-Nikkor.pdf

In winter I mostly stay in studio so I will see what I see with it

I like the visual nodal graph as I have never seen one before, but have chased them with LF Macro

[xkaes]

Here's a table of f-stops starting at f1 showing full, half, and thirds up to f4000 -- well past most pinholes. Sure, most meters don't go that high, but this might be helpful.

http://www.subclub.org/fujinon/pinfstop.htm

[Tin Can]

Thank you

Here's a table of f-stops starting at f1 showing full, half, and thirds up to f4000 -- well past most pinholes. Sure, most meters don't go that high, but this might be helpful.

http://www.subclub.org/fujinon/pinfstop.htm