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Mirror lenses!

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Snegren View Drop Down
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Post Options Post Options   Quote Snegren Quote  Post ReplyReply Direct Link To This Post Topic: Mirror lenses!
    Posted: 1 hour 13 minutes ago 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. Edit: Dust donuts, I should be more careful scrutinizing my images.

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
“People demand freedom of speech as a compensation for the freedom of thought which they seldom use.” Søren Kierkegaard
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Dopol View Drop Down
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Post Options Post Options   Quote Dopol Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday 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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Howard_S View Drop Down
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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday 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
Howard Stanbury Instagram | Flickr | Web
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XKAES View Drop Down
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Post Options Post Options   Quote XKAES Quote  Post ReplyReply 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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darosa View Drop Down
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Post Options Post Options   Quote darosa Quote  Post ReplyReply 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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woodrim View Drop Down
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Post Options Post Options   Quote woodrim Quote  Post ReplyReply 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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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply 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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Howard_S View Drop Down
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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply 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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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply 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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Post Options Post Options   Quote Howard_S Quote  Post ReplyReply Direct Link To This Post Posted: 04 December 2021 at 13:06
I doubt they would opt for less secure protocols. Let the user decide by changing settings or browser.
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XKAES View Drop Down
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Post Options Post Options   Quote XKAES Quote  Post ReplyReply Direct Link To This Post Posted: 04 December 2021 at 12:56
Why not tell Chrome, etc. to change their policy instead?
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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 04 December 2021 at 09:52
There is a setting in Chrome (Edge, Opera) where you can allow specific sites to show both http material on https sites - like Dyxum.
I was annoyed that I could not see the pictures posted by Keith and Keith not being willing to upgrade to a https server - so... I changed the setting for Dyxum.

In Opera:
Settings > privacy and security > site settings > Additional content settings > insecure content > Allowed to show insecure content => there you can add specific sites, like Dyxum.com.
Other Chromium based browsers (like Chrome and Edge) have a similar setting.

@Keith: maybe adding a disclaimer to your picture posts? It stops the discussion about the pictures showing, so we can talk about the pictures
Why not follow me on Instagram? @Addy_101
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 04 December 2021 at 08:07
Some browsers fail to show linked photo's when they're not hosted on a secure "https" site.

Mozilla Firefox shows them all, Chrome doesn't.

Another option that sometimes works is right-clicking the image and choose "show image in new tab" and then it appears in a separate tab, but that's a bit of a drag when there are many photos in a post
You can see the April Foolishness 2021 exhibition here Another great show of the talent we have on Dyxum
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keith_h View Drop Down
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Post Options Post Options   Quote keith_h Quote  Post ReplyReply Direct Link To This Post Posted: 04 December 2021 at 05:28
Apparently its because my website is http, not https. Some browsers handle it as described as a result.
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