Lenses for FilmLab on 35mm films


#17

Some more information if you are interested in the Zeiss exolens macro.
I’m still waiting my item, this post is the result of collecting informations from the web in addiction to @ColSebastianMoran great work.

It looks like some kits contain the exolens with all the (6) soft liners to allow it to be mounted on iphone 5 to 7 (see previous post picture).

But other kits (older?) may contain only four liners:

The one for iPhone 7 plus being sold as an extra:

Going deeper on the exolens webite FAQ they claim there is a small difference between iphone7 black jet and other colors, they says they are going to provide the correct soft liner if you hapoen to own a jet black iphone 7.
Impressive customer service!

So pay attention if you buy online and you own an iphone 7 plus.
No hope if you own an iphone 8 or iphone X, btw

My 2 cents.


#18

Yes, there are older and newer kits. I have the newer with liners for the 7 Plus.

Good luck with your purchase.


#19

Hope they will continue to make adapters available as we go to the next generation of phones.


#20

Also beware: There is an Exolens product with no-brand glass selling for $10 to $40. Perhaps the Exolens Pro designates the Zeiss line, but hard to tell.


#21

my lens is arrived today, I have been lucky enough: all the liners are included in my set!
I will perform some test soon


#22

I have learned that the NON-Zeiss Exolens kits are NOT compatible with the Zeiss lenses. The threading on the mount is different. The brackets, mounts, etc. are not compatible.

This from Exolens customer service, who were very responsive and clear. Their address is customerservice@exolens.com in case that’s helpful to anyone.


0.2.1(5) release
#23

Here you can see a 35mm scan using Zeiss Exolens (iPhone 7+)

The phone was about 4cm from the film (I got the positive using snapseed curves).

!

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I have a question: how to combine manual focus of the lens whit autofocus of the iphone? When trying to set the correct focus on the lens iphon always try to compensate with autofocus, which is the correct way to combine hardware and software focus?
Thank you.


0.2.1(5) release
#24

Mauro, the control on this lens is a zoom, or more accurately, it’s probably vari-focal-length. It is not a focus control, though it might seem a bit that way.

I find it’s a trial and error process. Twist the lens, then move in/out till you get focus. If you don’t have the framing you want, repeat. Once you find the position for 35mm negatives, you won’t have to do this again.

These macro lenses (via iPhone auto-focus) have a very limited in-focus range, basically they work like a fixed focus lens. So, set the lens zoom position, then move in-out until you achieve focus. I do not think trying to control the focus (e.g. with one of the 3rd party camera apps) will do any better than the phone’s autofocus.

Your image: Stieglitz’ Pond-Moonlight revisited?

NOTE for other readers: This Zeiss add-on lens is unique; it is a zoom. I don’t think there are any other add-on lenses which zoom.


#25

Mauro, can we see the positive image you get through FilmLab?


#26

U@ColSebastianMoran thank you forthe suggestions.
I’ve discovered that holding for a couple of seconds your finger locks focus in iphone default camera app.
This helps a little.
From the zeiss website:

The macro-zoom lens with a focal length of 40 to 80 millimeters is the first and only smartphone accessory lens with a variable focal length setting. In combination with the optics of the smartphone camera, turning the ring does not increase or reduce the field of view. The ring functions much like a manual focus with which different planes can be set into focus. Depending on the setting, objects that are three to five centimeters away or five to eight centimeters away can be captured, enabling the full-frame razor-sharp capture of objects approximately three to twelve centimeters in size using the macro-zoom lens.
The supplied detachable semi-transparent diffuser can be used as a spacer. This ensures that the object is illuminated evenly and enables convenient focusing, even with a short object distance and a shallow depth of field.

I have attached a screenshot of film lab positive because the app crash when I try to save the image to camera roll

My image has been taken on the amazon river in colombia two years ago. Thank you for the pleasing comparison :wink:


#27

Interesting that the present it that way.

EDIT 12/19: Previous comments removed. See further posts below.


#28

@ColSebastianMoran I would like to build some simple rig to make acquiring negatives with my iPhone as easy as possible.
The idea is to have the phone mounted on a support standing 35/40mm from the lightpad and to be able to move the film to the correct frame, scan and repeat.

What you are suggesting is to leave the focusing ring of the exolens to a fixed position, let say, half run and letting the iphone autofocus do the job, is it correct?
My question is: is there some method to know wich is the best focusing/focal ring position to allow the iPhone to get the best result?
If it depends on the distance between sensor and film let assume they are 4cm far from each other.
Thank you for your help


#29

I have the same thought. A box about 1.5" high, maybe 3x5" horizontally. iPhone sits on top, held perfectly level. Hole in top for the lens to poke through. Black inside the box so there are no reflections. Set the height so that the lens focuses perfectly on the full 35mm frame.

One more tip: With a backlit subject (like our negatives on a light pad) you can get reflections off the lens hood. When I build my box, I might remove the lens hood.


#30

Focusing with the Zeiss Macro lens: I have done more reading and experiments, and I have changed my mind from previous comments, which I have removed above.

Mauro is correct, turning the “zoom” doesn’t change the image size very much (but it does change a little). Instead, this mainly changes the range in which the iPhone AF can focus.

To focus on larger object, say 2" to 5" long, looking into the front of the lens, turn it clockwise. Zeiss says this allows focus from “five to eight cm away.” With my mount, the Zeiss label is now at the side of the camera, like this:

171219-Zeiss-LongerFocus-IMG_0024

To focus on small objects, say less than 2", down to about 1" in length, looking into the front of the lens, turn it counter-clockwise.
Zeiss says this allow focus on objects from “three to five cm away.” With my mount, the Zeiss label is now pointing at the Apple logo, like this:

171219-Zeiss-CloserFocus-IMG_0025

OK, then how to use the lens for capturing a 35mm negative area 1.5" in length? For this size object, the close focus setting on the zoom gives a much better resolution. I now suggest, for 35mm captures, use the close setting, looking into the lens turn it counter clockwise, and bring the camera right up to capture only the length of the negative image.

Here’s the resolution comparison, marks on paper, actual pixels, subject length 1.5":

This zoom control is incredibly confusing. My suggestion: Figure out for sure which setting gives closest focus by taking a photo of a 1" subject, filling the frame. Use that setting to capture 35mm shots.


#31

@abe I am going to suggest a very specific feature request for macro lens users.
I know this sounds as (and probably is) a super specific request, but I’ve been able to find a camera app called “Halide” that allows visual and manual focus control via a slider.
More intestestingly the app lets you lock the focus to any desired distance, for example you can set the focus to the shorter distance available. It also offer a feature called “focus peaking” that uses a green noise effect to highlight the in focus area of the image:


You can barely get the same result by framing a very close object with the iPhone default camera app and touching the screen for a couple of seconds (focus lock).
This could be very handy with any external lens that has (a kind of) focus control as the exolens’ one.
So please think about adding some kind of manual focus control or a ‘set minimum focus distance’ option, hidden somewhere, in the future.
Thank you.


#32

I think I’ve found a good workflow using the “focus peaking” and “manual focus” feature from a third party camera APP.
Here you can see a screenshot of the scanning process:

I place the iPhone on some kind of support at tge desired distance from the film (about 4cm)
I set iPhone focus ( via manual fucus) to the minimum distance.
I enable the focusing aid feature called ‘focus peaking’.
Then I rotate the Exolens ring since I have the perfect focus (think to a focus finder in a dark room).
Take the picture (this app also supports RAW format).
Open the file in film lab for cropping, perspective correction and color invert.

Note that the ‘manual focus’ + ‘focusing aid’ features are very handy also if you are not using an external macro lens.

Original shot (b&w negative)

FilmLab positive

Original shot (Color negative)

FilmLab positive

Final images looks overxoosed to me but the original negative may be overexposed to because I shot mostly without using an exposure meter (and I often fail) but it may also be related to the lightpad and iPhone auto exposure combo.


#33

Mauro, I think you have a good approach. As long as you have the distance in a viable range for iPhone focus, this should work very well.


#34

FWIW, and off topic for this thread: I find that FilmLab is generally giving a too-bright conversion.


#35

I will. I definitely want to have appropriate manual controls for people who know what they’re doing and want to override the automatic settings.

It is. The new color conversion will fix this :slight_smile:. Stay tuned!

-Abe


#36

@abe thank you for your answer, your effords and your interesting newsletter on 2017.
I wish you and your family a great new year.