I'm sure some of you are aware, but for those interested in an inexpensive bellows with precision focusing, one model of Novoflex's vintage bellows (Balmin/Balco/etc) has a fine-focus feature. This bellows type is made of bakelite (or similar) and has a coarse adjust which is available by loosening a side screw, allowing the front standard to be moved forward/backward quickly. Once locked-down, the front standard rides on an interesting "rail" which is adjustable using the front screw. Each turn of the screw is ~1mm, and the knob has ~100 "knurls", so each knurl is ~10um. This makes precision focusing possible, and even shallow focus stacking up to 10x. The rail is is spring-loaded to eliminate backlash, and has a very smooth operation.
The most common configuration for this bellows is M42, and the rear standard camera mount is 360-deg rotatable so is great to use for "rotating" the subject. Overall this bellows is one of my favorites! Here's an example of the type on eBay (this one is Exacta mount):
https://www.ebay.com/itm/Novoflex-Exact ... 3679703798
Edited to add: Over the years I've contemplated mounting a NEMA-8 or maybe NEMA-11 stepper to drive the focus screw on these bellows. A 200-step (1.8-deg) motor would give 5um full steps and 1.25um quarter steps, so should be sufficient for fairly high magnification. Might be nice to eliminate the need for the linear rail.
Novoflex Fine-Focus Bellows
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Re: Novoflex Fine-Focus Bellows
I have difficulties identifying the exact model of this Novoflex-bellows. I am a big fan of Novoflex and have a number of the old bellows, but not the one you are talking about. Could you give some more details and pictures to make it easier to identify the model?
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Re: Novoflex Fine-Focus Bellows
Hi @KimP, and welcome to the forum!KimP wrote: ↑Wed Feb 01, 2023 10:07 amI have difficulties identifying the exact model of this Novoflex-bellows. I am a big fan of Novoflex and have a number of the old bellows, but not the one you are talking about. Could you give some more details and pictures to make it easier to identify the model?
I'm actually not sure what the official model name is for the M42 version, but for the CFD version it is "BALCAN". I think the M42 is called "BALCO". There are quite a few for sale right now on eBay, but unfortunately none of them state their model names.
Here's an M42 example:
https://www.ebay.com/itm/374341579711
And here's a CFD example:
https://www.ebay.com/itm/125713587640
Re: Novoflex Fine-Focus Bellows
Thanks a lot - it helped with the pictures. I thought it was one of the normal 2 "tube" models. Is the mono rail sturdy enough?
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Re: Novoflex Fine-Focus Bellows
The rail is very sturdy IMO. Only issue is there is a little movement when you turn the adjustment screw, but it pops back when you let go.
I've considered automating one of these but have not yet pursued it. I think it would be pretty easy to do.
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Re: Novoflex Fine-Focus Bellows
Yep, looks like the Exacta version is BALIX. Thanks for that link!KimP wrote: ↑Wed Feb 01, 2023 2:14 pmThe model is called BALIX - se here:
https://photobutmore.de/exakta/objektive/novoflex/
Re: Novoflex Fine-Focus Bellows
A little more clarification of the nomenclature:
The general name of the bellows model is "Balgengeräte I". The camera specific names are BALCO (M42), BALCAN (Canon), BALIX (Exa, Exakta, Topcon), BALMIN (Minolta), BALNIK-FTN (Nikon), BALZEN (Zenit (M39)). It was constructed in 1960 and was produced even up through the 70's. The interesting feature of this bellows is, as was pointed out in the beginning of this thread, the ability to make fine adjustments through a sort of built-in micrometer screw.
Reference: Dieter Gabler: Vollendete Spiegelreflex Fotografie mit Novoflex (1973)
The general name of the bellows model is "Balgengeräte I". The camera specific names are BALCO (M42), BALCAN (Canon), BALIX (Exa, Exakta, Topcon), BALMIN (Minolta), BALNIK-FTN (Nikon), BALZEN (Zenit (M39)). It was constructed in 1960 and was produced even up through the 70's. The interesting feature of this bellows is, as was pointed out in the beginning of this thread, the ability to make fine adjustments through a sort of built-in micrometer screw.
Reference: Dieter Gabler: Vollendete Spiegelreflex Fotografie mit Novoflex (1973)