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Topic ClosedMirror lenses!

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neilt3 View Drop Down
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Direct Link To This Post Posted: 04 December 2021 at 13:09
Originally posted by XKAES XKAES wrote:

Why not tell Chrome, etc. to change their policy instead?


Good luck with that one !
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
 



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Howard_S View Drop Down
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Direct Link To This Post Posted: 04 December 2021 at 13:23
+1

Apparently I can turn on the https security in Firefox. There’s a post about why it is implemented here, https://blog.mozilla.org/security/2020/11/17/firefox-83-introduces-https-only-mode/.
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addy landzaat View Drop Down
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Direct Link To This Post Posted: 04 December 2021 at 14:12
Originally posted by XKAES XKAES wrote:

Why not tell Chrome, etc. to change their policy instead?
Alfabet Inc (owns Chrome and Chromium): a $40 Billion profit company
Keith: a random Australian Joe
They'll listen

Back to the program? Mirror lenses. I have none, sorry.
Why not follow me on Instagram? @Addy_101
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woodrim View Drop Down
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Direct Link To This Post Posted: 04 December 2021 at 14:49
Why are we now having this problem? Something new?
Regards,

woodrim
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darosa View Drop Down
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Direct Link To This Post Posted: 04 December 2021 at 14:54
No, old problem that raises its head now and then.
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XKAES View Drop Down
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Direct Link To This Post Posted: 04 December 2021 at 20:10
Here are the results from my quick comparison between -- left to right:
#1 -- Spiratone Minitel f8 (third version)
#2 -- cropped to size Soligor 200mm C/D f2.8 @ f8
#3 -- cropped to size Tokina APO 80-200mm f2.8 @ f8

All pictures taken on a tripod in the same spot at f8 with mirror lock-up and a cable release. Sony a850 with all settings at factory default -- no adjustment in contrast, sharpening, D-R, etc.

Manual focusing with a Minolta 2x viewfinder magnifier. ISO at 100. Shutter speed set by camera.

I really can't tell any significant difference although the edges of the 500mm shot are actually the edges, while the edges of the cropped 200mm shots are obviously not.



The "streaks" on the test card are just that.

I may go pixel peeping at some point, but it's not on the top of my list. My 500mm is still bigger and heavier that the 500mm CAT, but I think I'll run a test of my 500mm CAT vs Sigma 500mm APO f7.2.

Edited by XKAES - 04 December 2021 at 20:14
 



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Direct Link To This Post Posted: 05 December 2021 at 11:50
I went out yesterday and got a range of results at the Wittenham Clumps in Oxfordhire (all A7 <> LA-EA4 <> Minolta AF Reflex 500mm F8)

1

Trees at Round Hill

2

Dorchester Abbey

3

Bokeh

4

Edge

5

Don't be a tosser

6

Red kite
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Dopol View Drop Down
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Direct Link To This Post Posted: 05 December 2021 at 13:11
The 1sr, 4th ans 6th are very nice. Particularly the 1st one
The ‘typical’ Teleshot is completely free of donuts. Nice.
Be yourself; everyone else is already taken
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Snegren View Drop Down
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Direct Link To This Post Posted: 06 December 2021 at 12:50
Not a lot of light in The Low Lands as it is "dark days before Christmas" time and then there a late afternoons where there is hardly any and then you need a f2.8 CAT or a tripod.

From Blijdorp Zoo on the day I captured the heart of a fine lady.

1: Prairy dogs

Camera Model: ILCE-7M3
Lens: Minolta RF Rokkor 250mm 1:5.6
Aperture: f/5.6
Exposure Time: 0.003 sec (1/400)
ISO: 2000

2: Prairy dog

Camera Model: ILCE-7M3
Lens: Minolta RF Rokkor 250mm 1:5.6
Aperture: f/5.6
Exposure Time: 0.003 sec (1/400)
ISO: 1250

From a late afternoon hike on Planken Wambuis near the Dutch Veluwe National Park. Should have brought a tripod, IBIS can only do so much

3: Can't see the forest for the trees

Camera Model: ILCE-7M3
Lens: Minolta RF Rokkor 250mm 1:5.6
Aperture: f/5.6
Exposure Time: 0.017 sec (1/60)
ISO: 3200

Edited by Snegren - 06 December 2021 at 20:58
“People demand freedom of speech as a compensation for the freedom of thought which they seldom use.” Søren Kierkegaard
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Snegren View Drop Down
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Direct Link To This Post Posted: 06 December 2021 at 19:51
EXA.Ia in the Zebra Cabinet

Camera Model: ILCE-7M3
Lens: Sigma Mirror-Telephoto 1:8 600mm Multi Coated
Focal Length: 600 mm
Aperture: f/8.0
Exposure Time: 2
ISO: 100

Big CAT on fire (Sigma Mirror-Telephoto 1:8 600mm Multi Coated, LA-EA4 adapter to Sony A7M3)

Camera Model: ILCE-7RM4
Lens: Minolta RF Rokkor 250mm 1:5.6
Aperture: f/5.6
Exposure Time: 0.013 sec (1/80)
ISO: 12800
“People demand freedom of speech as a compensation for the freedom of thought which they seldom use.” Søren Kierkegaard
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Fred_S View Drop Down
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Direct Link To This Post Posted: 06 December 2021 at 20:08
That Rokkor mirror gives very nice results Paul. Sahrp where it should.
And the mirror even doubles pictures (the prairy dogs #1 and 2 in the previous post)
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Direct Link To This Post Posted: 06 December 2021 at 20:29
Here is a few from the Antwerp Zoo DM with Samyang f6.3/300mm

#1




#2


#3
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Snegren View Drop Down
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Direct Link To This Post Posted: 06 December 2021 at 20:58
Originally posted by Fred_S Fred_S wrote:

That Rokkor mirror gives very nice results Paul. Sahrp where it should.
And the mirror even doubles pictures (the prairy dogs #1 and 2 in the previous post)

That error was easily fixed Fred!
“People demand freedom of speech as a compensation for the freedom of thought which they seldom use.” Søren Kierkegaard
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Fred_S View Drop Down
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Direct Link To This Post Posted: 07 December 2021 at 19:52
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