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Canon 20mm f3.5 Macrophoto lens
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PostPosted: Tue Aug 28, 2018 1:49 pm    Post subject: Canon 20mm f3.5 Macrophoto lens Reply with quote

Couple of shots of a flower in my garden using the Canon 20mm f3.5 Macrophoto bellows lens. Mounted straight on the camera this time, as I was just trying it out. As these are with the lens mounted directly on the camera without bellows, and I think it gives a 1-2x lifesize image like that. To be honest this lens needs a tripod and additional lighting, especially at higher magnifications. These were taken at ISO2500 and 4000 and f8, and even so, I was at the limit of hand holding it. 2 pictures showing the lens on a camera as well.


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PostPosted: Tue Aug 28, 2018 4:49 pm    Post subject: Reply with quote

Very nice Jonathan! Bit used outside its specs (which calls for longer extension), but clearly shows how well this lens works even there!
Here it is on my macrolenses database: http://www.macrolenses.de/ml_detail.php?ObjektiveNr=9


PostPosted: Wed Aug 29, 2018 12:03 am    Post subject: Reply with quote

Canon also made a 35mm f/2.8 bellows macro lens. I've long wondered how these two lenses perform, and I think these are the first photos I've seen from one.

Back when I was a regular FD shooter, obtaining one of those lenses was always on my "to buy" list, but I never did get one. Nice to finally see one being put to proper use. You should really try them out on bellows, though.


PostPosted: Wed Aug 29, 2018 9:16 am    Post subject: Reply with quote

Thanks Klaus, yes outside of how it's meant to be used, but still I'm very impressed with it.

Cooltouch, definitely, I shall be trying it out either on bellows or using extension rings. These shots were really just to see if it was ok. Even like this, hand holding was virtually impossible, so I shall have to have a good think about how I will hold it and light the subject for using it on bellows/extension tubes. This one came up for auction near to me, and I made the guy an offer on it. I was amazed when I opened the box, that it looked basically unused. Apparently the guys father bought it in the 1980s for some reason and he found it when emptying his fathers house. I shall keep an eye out for the 35mm one too Smile


PostPosted: Wed Aug 29, 2018 1:27 pm    Post subject: Reply with quote

You're gonna have to use a tripod, or some other sort of stable support -- like a copy stand -- when you use that lens with a bellows. What I found to be very useful when working with high magnification, especially when outdoors, was a focusing rail. I bought one of these:

Click here to see on Ebay

It's useful because it allows for small precise movements in both the x and z directions, but not y. Can't have everything, I suppose. I mount my bellows with camera attached directly to this focusing rail, then mount the assembly to my tripod. With this employed, once I have my subject within a reasonable range of the viewfinder, I can use the focusing rail's controls to center the subject and even bring it into precise focus. Very handy for high magnification work.


PostPosted: Wed Aug 29, 2018 3:19 pm    Post subject: Reply with quote

Thanks for the link Cooltouch. I do have a Kaiser copy stand, with a fine control on the vertical, so will give that a go first, however I probably will end up getting a dedicated rail for the fine movements.

As an aside, the 35mm version, there are a few on eBay at the moment but for considerably more than I paid for the 20mm version. I think the 35mm one will have to wait for now....


PostPosted: Thu Aug 30, 2018 11:59 am    Post subject: Reply with quote

While it wasn't raining I tried a couple of shots of a sunflower in UV. These were done with a UV converted Canon Eos 7D, and again without extension tubes. Hazy sunlight, ISO640, f11 and 30 seconds exposure. Mirror lockup and a 2s delay on the shutter. White balanced on a PTFE tile. Camera and flower balanced on the wooden decking in the back garden, and yes I need to get a better support sorted out. The first image is of 2 of the petals, and the second image part of the centre of the flower with the petals in the background.


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PostPosted: Thu Aug 30, 2018 12:11 pm    Post subject: Reply with quote

I have a Olympus Zuiko 20mm F3.5 which is very similar to this Canon. The link to the thread about my lens:

http://forum.mflenses.com/viewtopic.php?t=68105


PostPosted: Thu Aug 30, 2018 3:47 pm    Post subject: Reply with quote

Wow, nice detail. Only thing is, for the subject, even f/11 is a bit lacking as far as depth of field goes. Might be time to try f/16 or higher. If you can do a 30 second exposure with no movement of the subject, you should be able to do longer with little problem.


PostPosted: Sat Apr 11, 2020 11:00 am    Post subject: Reply with quote

JMC wrote:
While it wasn't raining I tried a couple of shots of a sunflower in UV. These were done with a UV converted Canon Eos 7D, and again without extension tubes. Hazy sunlight, ISO640, f11 and 30 seconds exposure. Mirror lockup and a 2s delay on the shutter. White balanced on a PTFE tile. Camera and flower balanced on the wooden decking in the back garden, and yes I need to get a better support sorted out. The first image is of 2 of the petals, and the second image part of the centre of the flower with the petals in the background.


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Missed this one, nicely done Jonathan! Never tried UV with those Canon dedicated macro lenses!!


PostPosted: Sat Apr 11, 2020 3:53 pm    Post subject: Reply with quote

There might be something of interest here:

https://www.photomacrography.net/forum/viewtopic.php?t=38216

https://www.photomacrography.net/forum/viewtopic.php?t=36249

https://www.photomacrography.net/forum/viewtopic.php?t=12506


PostPosted: Sat Apr 11, 2020 8:02 pm    Post subject: Reply with quote

Thanks Klaus. I'd forgotten about this - I must run the Canon 20mm through my lens transmission setup and see how far into the UV it goes.

E6filmuser, cool links. The stacking that people do for these macro images amazes me. I don't have the patience for it at the moment, but later perhaps.


PostPosted: Mon Aug 16, 2021 9:31 pm    Post subject: Reply with quote

JMC wrote:
Thanks Klaus. I'd forgotten about this - I must run the Canon 20mm through my lens transmission setup and see how far into the UV it goes.

E6filmuser, cool links. The stacking that people do for these macro images amazes me. I don't have the patience for it at the moment, but later perhaps.


UV pass filter held in front of Canon macrophoto 20mm lens. f8 crop.


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PostPosted: Thu Oct 14, 2021 12:48 pm    Post subject: Reply with quote

I took this stack of frames and processed them with Helicon. Nearly fell out of my chair. I usually shoot with this lens stopped down to f8 or more for depth. I used it wide open this time. I can't believe the detail. It even got rid of the that annoying hexagon bokeh.

I wanted to go deeper, but I ran into the end of the focus helical. Should have started in the middle. Also, the end of this chinese focus helical has a little bump, like it straightens up the sag. So, I had to toss the last frame.

The software did all of the work. All I had to do was twist the focus helical a little bit between frames. It's pretty crazy what this app can do. If I had to guess the width of the frame is about 2mm. I'm not sure how close to the 20x maximum that is for this canon lens on a Sony APS-C. Maybe 11:1?

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PostPosted: Thu Oct 14, 2021 10:07 pm    Post subject: Reply with quote

Photos with a Baader U-Filter rear mounted and a UV torch. These images were made from stacks of 8 and 18 of 1 - 2 second exposures. I could add more photos to the stack, but I was really only testing this lens with a rear mounted filter.

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Single frame without the stack.


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PostPosted: Sat Oct 16, 2021 12:37 pm    Post subject: Reply with quote

Blazer0ne wrote:

.......... I ran into the end of the focus helical.



Do you have a picture with the whole macro rig?


PostPosted: Sat Oct 16, 2021 1:49 pm    Post subject: Reply with quote

I used focus stacking so it was nothing more than a standard M42 macro helical.








PostPosted: Sat Oct 16, 2021 5:09 pm    Post subject: Reply with quote

That helicoid tube is not good when working at high magnifications.
Put the lens on a dedicated macro rail: Contax, Minolta, Pentax etc.
Hand held is out of the question.


PostPosted: Sun Oct 17, 2021 1:24 pm    Post subject: Reply with quote

Of course I use a tripod. I can really dial it in with a video head.

For the macro rail are you referring to something like the Nikon Pb-4 or Pb-5 bellows?


PostPosted: Mon Oct 18, 2021 6:38 pm    Post subject: Reply with quote

I've not seen the drop in filter adapter unit. Explain please.


PostPosted: Mon Oct 18, 2021 8:58 pm    Post subject: Reply with quote

Blazer0ne wrote:
Of course I use a tripod. I can really dial it in with a video head.

For the macro rail are you referring to something like the Nikon Pb-4 or Pb-5 bellows?


PB-4 would be my choice due to swing & shift movements.


PostPosted: Wed Oct 20, 2021 8:49 pm    Post subject: Reply with quote

Blazer0ne wrote:
I used focus stacking so it was nothing more than a standard M42 macro helical.


Interesting drop-in rear filter tube - did you 3d print it entirely or did you combine existing hardware?

/Edit/ I just saw your post in the adapter subforum:
http://forum.mflenses.com/mounting-2-filter-drawer-behind-lens-t82992.html


BTW, most people report better stacking results when they vary the distance between camera and subject, either by moving the camera or the subject. Varying the amount of extension can introduce problems for the stacking software.


PostPosted: Thu Oct 21, 2021 4:44 am    Post subject: Reply with quote

Thanks, No problems for me with focus stacking using helicon app. Still trying to locate my M42 to F mount ring for the bellows.