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08-29-2007, 03:01 PM   #16
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QuoteOriginally posted by JCSullivan Quote
I typed in exactly what it says.
Will grab a shot and post.
Would be interested in a shot of it as well as with it, if you don't mind.

I've never come across a mirror lens as short as 400mm before.

08-29-2007, 03:31 PM   #17
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Would love to but...like I said

It will fit on the ME, ME Super and the KX but NOT on the istD
08-31-2007, 06:46 AM   #18
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Can this lens be THAT rare - no one knows anything about it?!
08-31-2007, 02:54 PM   #19
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I have Sigma 400/5.6 MC . All the photos on my page @ 400mm are done with it. Superfast focus, but a little bit too soft sometimes. Looks nice tho. The used item price was same as the Sigma 70-300 DG Macro new.

08-31-2007, 05:50 PM   #20
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Thanks Rennu. Is it the same as what I have pictured? I note you say M42 in your SIG, does that mean your 400mm is the M42?

Also, note you have the 100D and, if you have the K-mount lens does it fit onto the 100D without problems.

Like I said, mine will not turn, on the istD.

I like the people gallery especially the 2 girls on the log in b/w and the full-face of the boy.
08-31-2007, 05:58 PM   #21
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If the lens is a true K mount, it will fit all of the Pentax DSLRs, no problem
08-31-2007, 06:04 PM   #22
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Makes sense but nobody seems to know anything about this lens. No reference to it on the net - that I've been able to find.

As said earlier, in case you missed it - it fits on the film cameras but not the istD - perhaps Rennu will reply to my questions and that's when I'll find out if it fits on the K100D if what he has is the K-mount.

Odd non!
08-31-2007, 10:52 PM   #23
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It's totally K-mount with superb AF speed. I cought a dragonfly totally focused passing by with a first try @400mm for example.

Here it is -




And here are some samples:

400mm @ f5.6


400mm @ f8


400mm @ f5.6 100% crop


400mm @ f8 100% crop



Last edited by r3nx; 09-01-2007 at 12:53 AM. Reason: Added info and sample pics
09-01-2007, 04:23 AM   #24
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We are NOT singing from the same hymn book.
That is NOT the lens of which I posted 3 pictures further-up.

So, again, is there anyone in this big wide world of Pentax lenses who knows anything about it. Why would it fit on the film cameras and not the Dslr.
09-01-2007, 05:10 AM   #25
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Oh sorry, I thought you knew what I was talking about of :P I haven't seen or heard about the mirror lens never in my life :P (until your post back there)
09-01-2007, 06:42 AM   #26
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Not a problem Rennu. But, I came back here to post some positive results.

I retried the lens using 2 teleconverters and it worked. Then, I thought I would try again lens to camera and it WORKED. I really don't know why it wouldn't in the first place. So, I guess I'm glad of that.

This is a manual lens - can someone remind me what settings to use on a Digital - is it the M or the Av.

I'm going to write to Sigma direct to see whether they can clue me in on the details.

Thanks for bearing with me.
09-01-2007, 06:44 AM   #27
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Doesn't MC stand for a Minolta mount? This could explain the issues on a Pentax body. The issue now becomes can you get an adapter to fit a Pentax K mount. I did a little looking, and didn't find anything. Maybe an MC to 42 thread, then a 42 to a K adapter. The problem going this way, you just lost infinity focus. It is like adding an extension tube to your lens.

I have a cheap Samyang 500 F/8 cat that I use on rare occasion. Honestly, when I got film with it, I never had a keeper. No contrast, slightly soft, etc... With digital and some post processing, it actually isn't that bad.

If you come across a catadioptric lens dirt cheap, I suggest you try it out. The results just might surprise you for the money spent.

EDIT: Looks like we posted at the same time. If it fits, then maybe it isn't the old Minolta MC mount after all. I have no clue why it would just fit. Does it fit good or is there some play?
09-01-2007, 07:01 AM   #28
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QuoteOriginally posted by JCSullivan Quote
So, again, is there anyone in this big wide world of Pentax lenses who knows anything about it. Why would it fit on the film cameras and not the Dslr.
Oh, that's an easy one. It's not a true K-mount. It's a hybrid mount that would fit Pentax and Ricoh cameras. Those have a nasty habit of getting stuck on Pentax DSLRs. If you are handy with tools, you can correct the problem.

Here's a useful thread on DPR, including steps on how to perform a flangectomy

The Canonical Stuck Lens Information thread: Pentax SLR Talk Forum: Digital Photography Review
09-01-2007, 07:18 AM   #29
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MC stands for MultiCoated.. :P
09-01-2007, 11:42 AM   #30
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It is a Pentax mount. I guess I was being blind when inserting the lens in the camera.

I'm attaching 4 images - not much wildlife around here. These were taken without any filter at the rear because the filter tray is broken. I'm gonna have to play around.

These were shot with the istD at low quality - so maybe I should shoot at higher quality the next time. But like many have said, the bokeh is not something to write home about and neither is the sharpness - "soft" as Roy would say.







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