This 900mm Is WEIRD! 🤪📸

[NetvoTV]

Bokeh Ring is the friendlier name and it's an art itself too :-)

[PhotonReceiverAstrophotography]

Interesting to see a cassegrain style lens for cameras. Normally these are used for astronomy.

[ded-_-pihto]

There is a hex screw on the side of the adapter, you need to tighten it and then the lens will not rotate in the adapter

[eastersundaecavity]

Tom, try out using a threaded lens hood on it. I use an 800mm f8 lens like that one for hobby wildlife photography and the contrast improved greatly after acquiring a lens hood. After some time practicing, it's also possible to shoot at below 1/100 even without ibis. My camera is a Canon 7D for reference, which has no ibis to speak of.

[angelsjoker]

Actually, I liked the shown portrait with the lack of contrast better than the edited version. It had a nice moody charm to it.

[ExploringNew]

Ain't no way they make reflective telescopes into lenses now

[speedy]

Would be interesting to use for astrophotography.

[VAMPastro]

The proper name is Schmidt Cassegrain. Named after their creator, he originally created these for deep feild astronomy, as a means to see tiny things (high f ratio) with a smaller telescope. this dosent matter because all astro-photos take minutes to days of exposure time. Using it for traditional photography seems like a gimmick.

[rb]

I bought one many MANY years ago for one of my Nikon cameras, and I've used it a few times throughout the years! It's also known as a CATADIOPTRIC LENS! Which makes it a Specialty Lens!!!❤

[nyomansatriaadhityaputrame]

I have this type of lens, Minolta 500 f8 AF Reflex.. Nice to have, quite sharp and tbh this lens not mean to be handheld.. The nice thing is, bokeh are unique (we called it donut), contrast not to good but have really good skintone on my old Dynax7D and A900..

[G]

I’ve got the Russian 1000mm. It’s made of solid brass. Excellent tool. You can get some very interesting results.

[_cmi]

They might be ok for astrophotography. A lot of telescopes have high f values and they can still pull out amazing images of whatever junk is floating out however many light years away. It’s a different method of taking photos so f/8 don’t matter.

[silvere]

Mirror lenses have been around for a long time. New ones haven't been very popular though! The donut bokeh is is signature.

[wesleyjohnson]

Mirror lenses (or catadioptric lenses) have a low resolution limit because the aperture is so small.
Resolution is directly limited by the size of the aperture.
So the larger the aperture the better the resolution.
And actually for telescopes the super long f ratio gives it higher contrast views

[mingkaichan]

I have Minolta 500 AF Reflex, which is the only one mirror lens with auto focus. The image quilt is great and the circle bokeh effect is very pretty. But the lens should use for planes, flower, birds or insects only, otherwise you have to stand very far away to use it.

[mihaitudorpopescu]

I love it and the vibe it creates. Where can I buy it?

[cxn]

Contrast suffering maybe due to the large central obstruction decreasing the modulation transfer function of the lens.

[shyamalganguly]

A catadioptric lens it is! The results are no less than stunning as always but the looks are also awesome!

[jablodoes]

yeah……lenses like this has me thinking the photography tech people are just bored at this point

[Iaubou]

The out of focus holes part is beacause of the cassegrain design. Normally in telescopes when massivlely out of focus you will see the inner telescope hole in the object you are viewing. Because of the tube for the light to actually hit the eye/ sensor is in the way.