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neuroanatomist · Mar 30, 2026

I’ve looked, no joy. If you find one, please post it!

Copland · Mar 30, 2026

Isn’t there any solution offering a cover cap for the mounting point when the tripod foot is removed on 24–105 Z or 70–200 Z?

I was already quite surprised when I got my new 70–200 Z, back then I expected at least some kind of cap or alternative end piece to be included in the box. Something like the neat little short replacement foot you sometimes get with the white longer telephoto lenses.

Honestly, it’s a bit disappointing that no one at Canon seemed to put any thought into this.

A few months later, when I also got the 24–105 Z, I thought: Alright, let’s check online, surely by now there must be some third-party manufacturers making something for this. Brands like JJC are usually pretty quick with accessories, and there are plenty of other chinese manufacturers as well. But to my surprise, I couldn’t find anything there either.

Of course, that doesn’t necessarily mean it doesn’t exist. I definitely don’t know every small manufacturer out there. And especially on social media and in forums, there are always clever people who design and produce niche solutions like this, whether via 3D printing or CNC machining in small batches, like those lens caps with AirTag slots, for example or hot shoe caps.

So, does this really not exist, or am I the only one bothered by this unfinished, sharp-edged mounting point?

Click · Mar 30, 2026

Lovely shots, danfaz.

danfaz · Mar 30, 2026

Barely managed to photograph this Green-violet Swallow last Saturday. They just dart around all over the place, just sitting still for a second! LOL

AJ · Mar 30, 2026

hmmm yeah that converter looks defurbished, not refurbished. Furbishing gone wrong.

m4ndr4ke · Mar 30, 2026

neuroanatomist said:
I would prefer it to not be the lens, because the service life for the 600/4 II ended last year, so sending it to Canon is not an option.

I could be wrong, but it is my understanding that Canon will repair lenses beyond that date, for as long as the necessary parts are still available — they just can’t get new parts, so when they run out of stock it’s really over.

Now, for the issue you’re reporting, firstly I was thinking about the two extra pins for teleconverters, on the lens but, since you were able to try a different lens, it got a little confusing.

My first suggestion would be cleaning all mounts contacts (yes, again) thoroughly, because if there were any kind of grease or dirt that could be creating conductivity issues, you would have pretty much spread it across all lenses, with all the lens swaps you just made while troubleshooting this (contamination). Include the adapters.

Do not use WD40 or any other greasy products, use a dedicated contact cleaner or isopropyl alcohol.

Also check for loose lens mounts bayonets. Include the adapters.

If it doesn’t work, do you have any nearby store where someone knows you? Perhaps you could ask to briefly test a different teleconverter and/or a different lens.

AlanF · Mar 30, 2026

ISv said:
Women have XX chromosomes, no body can survive without at lest one X chromosome. YY without X is not survival. I'm pretty sure you know this - need extra coffee?

Typo

ISv · Mar 30, 2026

foda said:
Thank you very much. I'll be on Oahu this week and will definitely check out that area.

Look for the Brothers in Valor Memorial on the map of Waikiki. And take your time to look carefully in the flocks of Common Waxbill. The Orange-cheeked Waxbill is a single bird between 10-30 Commons. In the grass it takes time to see it!

ISv · Mar 30, 2026

AlanF said:
Their genetics is really interesting. You are right, the US Green Teal mitochondrial DNA differs from the European Common Teal by a massive 5.9%. So, the maternal line, down which the the mitochondrial DNA passes, is very different, having diverged some 2.6 million years ago. The nuclear DNAs are much more similar, like 99.7% the same. This may be due to the females always going back to the same place to breed whereas the males travel widely to mate. Interestingly, birds are the opposite of humans for sex linked chromosomes. Whereas human men are XY and women YY, male birds are ZZ and females WZ.

Women have XX chromosomes, no body can survive without at lest one X chromosome. YY without X is not survival. I'm pretty sure you know this - need extra coffee

?

ThomasTH · Mar 30, 2026

Great photo! The light and reflections are awesome.

DocInfoSci · Mar 30, 2026

Thanks, I’ll venture a try.

candyman · Mar 30, 2026

GirlsAreBeautiful said:
STM is also noisy, at least from what I can remember when I tried it.

I don't believe that technology stands still. The STM of the present is not the STM of the past. The STM on my RF 10-20 is fast and silent.

m4ndr4ke · Mar 30, 2026

DocInfoSci said:
Yeah, my only STM lens is the EF 40mm f/2.8 STM pancake, and I have such a mixed relationship with it: on one hand, I love the compact nature for casual walk-around — but on the other the AF drive and manual interaction really irks me. I won't say I hate it, but I will say the only reason it remains in my kit is the compactness. If that's how STM lenses in general are being done I wouldn't vote for them with my cash. It's been such a turn off I haven't even made time to try the RF editions, but I suppose I should to see if they've improved.

GirlsAreBeautiful said:
STM is also noisy, at least from what I can remember when I tried it.

This is not to say that Canon completely reinvented them, but the latest iterations of STM motors are more enjoyable to use. It really depends on the lens, though.

The EF 40mm was the first or second STM lens ever, its autofocus is pretty slow and somewhat noisy. There's still a few lenses that I'd say are about as noisy as the 40, such as the RF 50mm f/1.8 and the RF 35mm f/1.8, but some others are different.

There's not a lot of lenses with the newest STM motors yet, as far as I know it's just the RF 7-14mm L, 10-20mm f/4 L (I think), 16-28mm f/2.8, 28-70mm f/2.8 and the 45mm f/1.2, but they are provide a significantly better user experience, being quiet and smooth. Some of them are pretty fast, and that includes the 28-70mm f/2.8, which seems to be about as fast as the EF 24-70mm f/2.8 II.

Additionally, it's important to distinguish the two types of STM motors. Lenses driven by gear type STM motors tend to be a little noisier and jerky (RF 16, 28, 35, 50,...), while lead-screw tends to be quieter and smoother (RF 24, 85, 10-20, 7-14, 16-28, 28-70,...).
The 45mm uses a new gear-type STM, being an exception, that feels to me like a slow but modern USM, it's pleasant, it's smooth and quiet.

Gear type STM are the smallest motors, being the only choice to equip the smallest lenses.

candyman · Mar 30, 2026

Click said:
Beautiful shot. Well done, cadyman.

Thank you very much Click.

neuroanatomist · Mar 30, 2026

AlanF said:
One corner (decentered) or all 4 worse?

All four worse.

GirlsAreBeautiful · Mar 30, 2026

STM is also noisy, at least from what I can remember when I tried it.

AlanF · Mar 30, 2026

neuroanatomist said:
Received the 'new' (refurbished) RF 2x from Canon USA. Turns out to be not quite as good as my original copy, so it will go back to Canon.

Original on top of each pair, top pair is the center, bottom pair is the corner.

View attachment 228669

One corner (decentered) or all 4 worse?

neuroanatomist · Mar 30, 2026

DocInfoSci said:
Wow -- that's noticeably worse. I'd have expected refurbished to be even better, honestly, with an assumed review by an actual human.

That's what I was expecting, or at least not worse. I know one person who pretty much only buys refurbished based on that premise. Seems not to be the case.

DocInfoSci · Mar 30, 2026

neuroanatomist said:
Received the 'new' (refurbished) RF 2x from Canon USA. Turns out to be not quite as good as my original copy, so it will go back to Canon.

Wow -- that's noticeably worse. I'd have expected refurbished to be even better, honestly, with an assumed review by an actual human.

Click · Mar 30, 2026

Great shots, antonn.

neuroanatomist · Mar 30, 2026

eero said:
Thank you for the reply. Please let us know here if you do and what the results are.

Received the 'new' (refurbished) RF 2x from Canon USA. Turns out to be not quite as good as my original copy, so it will go back to Canon.

Original on top of each pair, top pair is the center, bottom pair is the corner.

Click · Mar 30, 2026

Beautiful shot. Well done, cadyman.

foda · Mar 30, 2026

Thank you very much. I'll be on Oahu this week and will definitely check out that area.

ISv said:
Most of the tourists know the Ford DeRussy Park in Waikiki. Across the street against that park is situated the Ainahau triangle (big grass field) and next to it is the Brothers in Valor Memorial - also a grass field, small. It's where You have to look for flock(s) of Common Waxbills. The Orange-cheeked is between them.
Look for a red rump and off course for that orange cheeks.

ISv · Mar 30, 2026

AlanF said:
Their genetics is really interesting. You are right, the US Green Teal mitochondrial DNA differs from the European Common Teal by a massive 5.9%. So, the maternal line, down which the the mitochondrial DNA passes, is very different, having diverged some 2.6 million years ago. The nuclear DNAs are much more similar, like 99.7% the same. This may be due to the females always going back to the same place to breed whereas the males travel widely to mate. Interestingly, birds are the opposite of humans for sex linked chromosomes. Whereas human men are XY and women YY, male birds are ZZ and females WZ.

The similarity of the protein coding DNA of the Humans and Mouse is about 85%. Taken the entire genome DNA (incl. non protein codding DNA) similarity is ~50%. It looks like the mouse is 85% Human

. And yes, I'm suppose to know that it's all about the regulation (aka non-protein codding DNA).

ISv · Mar 30, 2026

foda said:
Nice photos! Where in Waikiki did you see the Orange-Cheeked Waxbill?

Most of the tourists know the Ford DeRussy Park in Waikiki. Across the street against that park is situated the Ainahau triangle (big grass field) and next to it is the Brothers in Valor Memorial - also a grass field, small. It's where You have to look for flock(s) of Common Waxbills. The Orange-cheeked is between them.
Look for a red rump and off course for that orange cheeks.

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