Increasing depth of field (DOF)

Hyperfocal distance is not something that trips off the tongue in this modern age of auto focus. In fact digital camera lenses do not have the facility to take advantage of this compositional tool. You just have to compare today’s lens with yesterdays they don't have aperture settings and therefore you can not play with hyperfocal distance settings.

So what is Hyperfocal distance?

When a lens is set to infinity, the depth of field (D.O.F) closest to the camera is known as the Hyperfocal distance for that aperture. If you have an older lens its barrel will be marked with these distances.

How to change the Hyperfocal distance.

Set the lens focus to infinity, and then read the lower mark for whatever aperture you have set. If you then refocus the lens to the lower mark known as the optimum distance you will increase your depth of field by fifty per cent of the optimum.

For example:

This was made using a
 telephoto lens at close distance.
 The use of hyperfocal distance has
 pulled the area of sharp focus
to the front of the ball.

I have used an old 50mm Nikon lens (pictured) to show how it works. I have set the focus to infinity and the aperture to F16. The good thing about this lens is that it shows the upper and lower limits of each aperture with lines on the lens barrel. Looking to the right (marked A) you can see that the last line on the lens barrel is opposite the five meter mark (about fifteen feet). By resetting the focus to optimum in this case five (A). Then look at the lower limit (marked B) for F16, it is about two and a half meters (eight and half feet). The resetting will extend the overall sharpness of the picture by an extra two and a half meters which is 50 percent of the optimum.

The longer the lens the greater the increase is. For argument, an 80 mm lens with an aperture of F22 set, would have a depth of field from 2.8 meters all the way to infinity when optimum focus is used. Instead of 5.6 meters to infinity.

If  hyperfocal distance had been
used with this picture the
 front post would be sharp.
 

In some cases where you do not have aperture lines on the barrel of the lens some cameras and lenses have a shut down button. This allows you to see before you press the shutter where the hyperfocal distance ends. So you can adjust it if needs be.

Being able to increase the depth of field (D.O.F) can be very useful when using medium and long telephoto lenses for subjects close to the lens, allowing narrow fields of sharpness to be moved. This makes sure the front of the item is in focus.

The soviets answer to the panaramic camera.

I have a twitter feed, Photomi7ch, during the middle part of last year. I
started to see references in my feed to a camera call FT2. My first thought was
they were talking about Nikon's Nikkormat FT2 as it was the only camera I knew of by this designation but the tweets did not make sense. I had some
how missed part of the plot.

 It was a wired sensation to note that the internet search suggested what I
stated above. In among all the Nikon references was a single mention of a
Russian camera call the FT2 panoramic things were starting to make sense.

On further investigation there is a whole world of soviet cameras that I was not
aware of. Obviously I knew that the eastern block produced cameras but not
such a plethora, the most well known being Zenit, Zorky and Prakticar The
dismisive way people treat these cameras from the soviet era in general is
unfounded. They are well made in what could be called an agricultural way and
do the job simply in comparison to the finesse of western offerings. I think
we spend to much time comparing and not enough time using them to there
best. It is a hang up of an art form that requires tech to produce the art work.
Loosing sight of what is important. The photograph.

The FT2 was produced between 1958 and 65 producing 16,000 of them during
that time. They made two main models series 1 and 2 the difference between
them was a leaver on the base plate that allow you to adjust a spring that
calibrated the shutter speed.

 The FT2 is a swing lens panorama camera with a fixed length 50mm f/5
industar. The turret moves from right to left traversing the image across a
curved film plan. The shutter speeds are set by the positioning of two brake
leavers on the top of the body. This allows the lens to swing at 1/60,
1/100,1/200 and 1/400 of a second. These are set independently of the film
advance. Uses 35mm film set for use with 36 exposure canister's. This gives
the user twelve exposures of 110 mm long.

 

Now we know what the box does, what is it like? It has a substantial feel to it
weighing in at 643 grams empty. It is a flattened cube measuring approx
120mm long, 85mm wide and 50mm deep with a simple fold up view finder.
When you are looking down at the top of the camera in both hands it reminds
me of those wind up cine cameras . A definite feel of purpose when being used.

The camera has been sitting around for sometime waiting for me to come up
with a plan of action. It is not straight forward to use film wise. It comes with
four special film containers that you have to load with film. That cannot be
loaded from a bulk film loader. As the canisters have a different wind on
connection.

 

 

I decided to play it safe and unreel a loaded film. I say safe it was a very out
dated roll of Agfa APX 100. I came at it from the point of view that if I balls it
up completely it would not matter so much as if it had been fresh film stock. In
a blacked out darkroom I transferred the film into the FT2 film canister's. It

went surprisingly well including the loading of them into the camera still in
complete black out. By doing this you dont not loose a frame to daylight which
would suggest thriteen frames insead of tweleve.

With the camerachallenge fast approching I was ready to take part camera
check, black and white film check, topic season.
It was a birght early morning with the sun not that high off the top of the ridge
at south common with some wonderful mottle cloud against a blue sky. As
suggested I used the camera hand held, pointed it in the direction of scene I
wanted to capture and pressed the shutter button. In the blink of an eye the
lens had traversed a 120 degrees of view clonk I don't know what I was
expecting but was a little disapointed with the action.

It takes three and a half turns of the winder to pull the next frame into place. I
noticed straght away that it felt like the film was slipping, that maybe the spool
was not holding the film firmly enough? Now't I can do so carried on.

 
Before I new it the film was finished.

To the darkroom, it was a little bit of a struggle to relice the back from the
body of the camera. Apart from that the rest went smoothly. Three quaters of an hour later the wet film was hanging up drying.

 I had nine good looking negatives I think that maybe the three and a half turns
was to much and the slipping did not help. Next time I will allow for it. Under
the cercumstances it was a good result.

 I have always enjoyed the panoramic format of image making. It is more in
tune with the way we see the world but more detailed.

 

Techinal data:

Agfa APX 100 developed at box speed in HC110 for 6 mins 1+37. 

Pictures and article are the Copyright Mitch Fusco 2023 

 

 

 
 

 

Understanding how to keep Dust at bay.

Have you ever sat and looked at that shaft of light streaming into the room revealing all those microscopic particles dancing in the air. Then blowing in that direction to watch them swirl around. It always makes me think how is it that our lungs do not fur up like that of untouched dust on a flat surface. 

With all those bits hanging around it is a wonder that the film photographer produces any sort of fine-looking photograph. What with having to check and clean inside the back of the camera where the film sits, the camera lens, the film when processed, the enlarging lens, the negative carrier with glass it just wares you out just thinking about it.

But we don't think about it seriously enough that is why we end up buying all these lens cloths, antistatic brushes, compressed air cans. The amount of time spent on blowing, wiping and brushing only to end up with more dust stuck to our optical surfaces than when we started. It is a wonder that a picture is produced at all.

What is it we need to understand? That the human body is a massive generator of static electricity. We have all experienced at some point walking up to the car and just as we are about to open the door, we get a shock off the car. Wrong you have just shocked the car it is an overload of static in your body grounding itself hence the shock as it leaves you. Yes! You.

The static builds up in us because of the manmade fibers rubbing against our bodies (plastic) acting as an insulator. If you have not earthed yourself, say by washing your hands and or walking around in bare feet. The static continues to build in extreme cases you can get fly away hair. This is where your hair starts to lift up from your head. Before it gets to this point most of us earth ourselves in some way dissipating the static before we get to that shock the car.

Some years ago, I spent a lot of time try to remove some spots of dust from the glass of the negative carrier, having removed it, to have it all come back tenfold as soon as I touched it with my bare hand. The air was blue with my frustration. 

Slowly the penny dropped I was the problem I was magnetizing the glass with the excessive static in my body. Time to sort this once and for all. I had sitting in a draw an earthing band that I used when building a computer. 

The earthing strap was set up by the enlarger where it has remained. It has put in sterling service over the years it's still a wonder, to watch the dust fall off the glass of the negative carrier when I touch it to it. It is also one of the first things I do when entering the darkroom is to touch the earth before I start setting things up. 

Occasionally you get a stubborn particle needing wiping off but nowhere near as much trouble to remove. Once done a touch to earth again making it ready to load the film that is earthed just before loading. 

This article is the copyright of Mitch Fusco 2022 all rights reserved 

Camera candy, Agfa Isolette

This is for all those who delight in the design and form of the light box. This one has some wonderful lines. I shell put it down nice and easy, so you can Savor its lines.

Related post:

An Agfa Isolette has landed.

Using the Agfa Isolette

Is it a love affair?

This is the saucy minx of an F5  I use to take most of my photographs with, coupled with the sexy little prime of a 28 mm lens. Add a roll of Agfa APX to caress the back of the focal plane shutter and I'm in for a sensual day of picture making.

With camera in hand I stroll out into a bright day with a gentle heat, fanned by a breeze that shifts the leaves on the trees. Now looking at the image in the view finder that is alive with dancing shadows I wait with finger poised touching the trigger in growing anticipation, waiting, waiting for the right breath of wind to push the shadows into place to complete the composition the eye so lusts for.

Click! anticipation spent, I turn away moving to the next flirtatious view to seduce my eye and so the day is flirted away click by click. Before I know where I am an entrancing morning has been teased away.

 

Not quite what I had in mind when I started writing this cheeky post but it does sex up the thought process behind the taking of each image made. A bit of fun at my expense. Believe it or not there was such a day and the pictures that illustrate this post are the results. A full days exposure and legal too!

Fuji GW690III Overview-Review

These cameras were the last to bear the name Fujica. First released in November 1978 as a professional unit with interchangeable lenses that were subsequently updated to a fixed lens.  They came in several formats from 4.5x6, 6x7, 6x8 and 6x9. The GW 6x9 was first released in 1985 and came with a fixed lens. The video above gives a nice insight into a range of camera that became known as the Texas Leica.

 Like to thank Mike Thomas for his insight into this camera.