• Ultraviolet Photography
  •  

Novoflex 400mm f/5.6 Noflexar

Lens
12 replies to this topic

#1 UlfW

    Ulf W

  • Members+G
  • 1,739 posts
  • Location: Sweden, Malmö

Posted 12 April 2021 - 11:28

Last Update: 03 April 2021 agb/label
Finalized: Work in progress.

Novoflex 400mm f/5.6 Noflexar

Manufacturer: Novoflex. The achromat might be made by Rodenstock
Lens Label: ( NOVOFLEX ) NOFLEXAR 1:5,6 f=400mm <serial number>
Currently manufactured: No
Lens type: Manual focus, Extreme tele lens, true long focal design
Design: Achromat, 2 elements in 1 group
Focal length: 400 mm
Aperture range: f/5.6 – f/32, Manual, 24 blades
Sensor format/coverage: up to 24 mm x 36 mm
Mount*: via a focussing bellows, BAL-U, with a suitable lens mount adapter part.
Helicoid: No, Focussing with a bellow at the rear of the lens
Flange Focus distance: M42/45.46 mm,
Front filter: 77 mm x 0.75 mm (there are lenses with a 75 mm x 0.75 mm thread too)
Introduction year: ca mid 1960
S/N of test object: 05118

* There are mount adapters for many different camera types.
Alternatively:
There are rigid spacer tubes instead of the bellows, also for different cameras.
However they give a very bad minimum focus distance.

A document showing different configurations and options for Novoflex lenses present when the document was written:
https://www.pacificr...00070/00070.pdf
There are more modern adapters for bellows and Schnellschuss-lenses, than listed in the document, including the CANA-AF for Canon EOS

Image of test object:

The measured object is the rather thin lens head, the second from the right, that can be used with different lens tubes:
Posted Image
See more details here:
https://www.ultravio...dpost__p__25241

Versions compatibility:
The Lens-heads of this generation share the mounting thread dimension and are interchangeable between the older Type-B and next generation Type-C, of Schnellschuss-lenses.
The last generation, the Type-D of Schnellschuss-lenses have a special new type of bayonet mount for the lens heads.

Transmittance Summary

Definitions of the parameters below
  • Range: The NOFLEXAR 1:5,6 f=400mm transmits 1-92% in an increasing slope from 316nm to 400nm.
  • TVISmax (%) = 97%
  • T400nm (%) = 92%
  • T365nm (%) = 87%
    This high percentage is an indicator for quite short exposure time under typical UV-pass filtration peaking around 360 nm or when using 365 nm UV-LED illumination.
  • λUV HMvis(nm) = 340nm
  • λUV HM400(nm) = 337nm
  • λUV Zero(nm) = 316nm
  • These three values indicate that the lens is working even for some upper UV-B photography with some filters and a few for this, suitable cameras.

Spectral Transmission Graphs

UV-NIR, Novoflex NOFLEXAR 1:5,6 f=400mm
[attachment=22895:Screen Shot 2021-03-20 at 10.25.30.png]
The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source.

UV, Novoflex NOFLEXAR 1:5,6 f=400mm
[attachment=22896:Screen Shot 2021-03-20 at 10.24.19.png]

UV-Log, Novoflex NOFLEXAR 1:5,6 f=400mm
[attachment=22897:Screen Shot 2021-03-20 at 10.24.39.png]
Numerical Spectra Data available: Yes

Filters and how to use them on this lens:
The front filter thread is an unusual 75 mm standard filter thread.

It is also possible to use rear mounted filters, either in lens mount adapters for mirrorless cameras like Sony A-series etc, or placed directly in the camera.

An alternative, is to putty-mount a filter directly inside the lens. There are several flat surfaces that likely would work to mount a filter or a step ring fitting the filter.

Handling and focussing:
Difficult due to the long focal length.
A stable tripod, or two, are needed to support the lens.

Flare and sun-stars:
TBD

Sharpness:
High for the age of the lens.

Lens distortion:
TBD

Chromatic Aberration in UV:
Yes both axial and lateral. Improves by stopping down and can often be tolerable.

Edited by UlfW, 16 June 2021 - 12:39.

Ulf Wilhelmson
Curious and trying to see the invisible.

#2 OlDoinyo

    Member

  • Members(+)
  • 876 posts
  • Location: North Carolina

Posted 12 April 2021 - 13:36

Sony A-mount is not mirrorless-- it is the DSLR/DSLT mount. E-mount is their mirrorless mount.

#3 UlfW

    Ulf W

  • Members+G
  • 1,739 posts
  • Location: Sweden, Malmö

Posted 12 April 2021 - 15:58

Sorry for the confusion.

I ment Sony A7-series and Sony A9-series cameras when I wrote Sony A-series and did not talk about any mount type.

The Sony A7 and A9 type full frame cameras share mount with their APS-C siblings.
The mount is called NEX or E-mount.
Ulf Wilhelmson
Curious and trying to see the invisible.

#4 colinbm

    Member

  • Members+G
  • 2,610 posts
  • Location: Australia

Posted 13 April 2021 - 08:45

I am not understanding these Novoflex lenses on focusing bellows ?
If they are made for SLR cameras that have a FFD of around 45 - 50mm, but the bellows has a distance of approx another 50mm to the lens flange.
Is the Novoflex lens 100mm or so FFD or is it already in macro mode ?

#5 UlfW

    Ulf W

  • Members+G
  • 1,739 posts
  • Location: Sweden, Malmö

Posted 13 April 2021 - 09:20

The long Novoflex Schnellschuss lens systams are modular designs with two components common for all in the center, the iris module and the gun-like fast-focussing grip.
The different parts join with either suitable thread joints or dedicated bayonet mounts.

On the motif side you can exchange the lens modules and on the camera side you can exchange the camera mount adapters.
Look at page 3 here: https://www.pacificr...00070/00070.pdf

There are two ways to adapt a camera, (I give examples for Canon FD type codes below.)
By a rigid camera adapter tube with a suitable matching camera mount type, catalog codes ending in BA, (CANBA) or
By a combination of a focussing bellows, (BAL-U), and a suitable short camera mount adapter, catalog codes ending in A, (CANA).

Both alternative combinations reach infinity, att shortest extension (by the bellows).
However the rigid tube alternative gives a very bad close focus distance, 400mm => 13 ft and 640mm => 33 ft
By using the bellows alternative you get a better close focussing ability (5 ft and 13 ft) and can also preset a focus distance for quick action.

The short camera adapters are of the same type as used for their Macro bellows and is more commonly available.
Ulf Wilhelmson
Curious and trying to see the invisible.

#6 colinbm

    Member

  • Members+G
  • 2,610 posts
  • Location: Australia

Posted 13 April 2021 - 10:18

Thanks Ulf, I'll read the book some more.

#7 UlfW

    Ulf W

  • Members+G
  • 1,739 posts
  • Location: Sweden, Malmö

Posted 16 June 2021 - 06:50

Added corrected information about the front thread.
Ulf Wilhelmson
Curious and trying to see the invisible.

#8 nfoto

    Former Fierce Bear of the North

  • Owner-Administrator
  • 3,243 posts
  • Location: Sørumsand, Norway

Posted 16 June 2021 - 07:35

I cannot see the illustrations -- are they gone by mistake?

#9 UlfW

    Ulf W

  • Members+G
  • 1,739 posts
  • Location: Sweden, Malmö

Posted 16 June 2021 - 08:09

Not gone, I took a shortcut referring to my rather extensive topic about these lens types by a link.
https://www.ultravio...dpost__p__25241

That was lazy, but I had no time to take new pictures of the lenses.
Do you think I shall repost the same picture here in this topic?

Edited by UlfW, 16 June 2021 - 08:42.

Ulf Wilhelmson
Curious and trying to see the invisible.

#10 nfoto

    Former Fierce Bear of the North

  • Owner-Administrator
  • 3,243 posts
  • Location: Sørumsand, Norway

Posted 16 June 2021 - 08:55

You can add them by using the IMG tag, thus they are re-used, not reposted. As of now they are non-clickable and refer to an uploaded image not accessible to the users.

#11 UlfW

    Ulf W

  • Members+G
  • 1,739 posts
  • Location: Sweden, Malmö

Posted 16 June 2021 - 09:23

How to use the IMG tag, please?
Is there any guide to that?

Edited by UlfW, 16 June 2021 - 09:28.

Ulf Wilhelmson
Curious and trying to see the invisible.

#12 nfoto

    Former Fierce Bear of the North

  • Owner-Administrator
  • 3,243 posts
  • Location: Sørumsand, Norway

Posted 16 June 2021 - 09:39

Insert your images by using the "Image" button -- the small one in the middle of the second top row in the editing pane. You are asked for a URL. Locate the actual image as originally posted and right-click it to see 'location' which is the parameter you require for the URL. Sorry, this sounds a little awkward and to tell the truth, it is. However, once you done it this becomes easy.

Do note you need to expand your editing mode to "Use full editor".


Posted Image

#13 UlfW

    Ulf W

  • Members+G
  • 1,739 posts
  • Location: Sweden, Malmö

Posted 16 June 2021 - 12:34

I have learned something new! :smile:

Birna, If you want you can delete these last messages, or at least mine, to clean things up.
Posted Image

Edited by UlfW, 16 June 2021 - 12:42.

Ulf Wilhelmson
Curious and trying to see the invisible.