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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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 Posted: Thu Apr 14, 2011 5:38 pm Post subject: Sigma Mirror-Ultratelephoto 500mm f/4 |
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Spotmatic wrote:
I just got this interesting lens. I knew beforehand that it could suffer from defects and sure enough, there's debris and a haze inside. But that did not prevent me from using it.
Disclaimer: because it is hazy I have increased the contrast.
Interesting is the original lens cap which can also act as a f/5.6 diaphragm 
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Crop from the above photo:
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Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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CarbonR
Joined: 31 Dec 2008
Posts: 1969
Location: Clermont-Ferrand, France
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| Posted: Thu Apr 14, 2011 5:53 pm Post subject: |
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CarbonR wrote:
Apart from the sharpness that does not seem to be extreme, is it actually usable ? I mean, a 500/4 refractor gives a very thin dof, but a miror should give a thinner one, according to my experience with mirors.
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Cameras : Canon 5D, Pentax K100D, Pentax 6x7, Spotmatic
Lenses : 15mm to 1000mm (24x36)
My websites : [FR & ENG]Takumar - the eyes of the Spotmatic : info about all Takumar lenses // Kogaku - My photo site
I am selling : Takumar lenses and rare Pentax bodies, pm me if you're interested in something [MFLenses feed-back]
Information on Takumar lenses with samples :
Wide angle : Takumar 15/3.5 15mm, Takumar 17/4 17mm, Takumar 18/11 18mm, Takumar 20/4.5 20mm, Takumar 24/3.5 24mm, Takumar 28/3.5 V1 28mm, Takumar 28/3.5 V2 28mm, Takumar 35/2 V1 35mm, Takumar 35/2 V2 35mm, Takumar 35/2.3 35mm, Takumar 35/3.5 35mm, Takumar 35/4 35mm
Standard : Takumar 50/1.4 V1 50mm, Takumar 50/1.4 V2 50mm, Takumar 50/3.5 50mm, Takumar 50/4 50mm, Takumar 55/2 55/1.8 55mm, Takumar 55/2.2 V1 55mm, Takumar 55/2.2 V2 55mm, Takumar 58/2 58mm, Takumar 58/2.4 58mm
Short tele : Takumar 83/1.9 83mm, Takumar 85/1.8 85/1.9 85mm, Takumar 85/1.8 85mm, Takumar 100/2 100mm, Takumar 100/3.5 100mm, Takumar 100/4 100mm, Takumar 105/2.8 V1 105mm, Takumar 105/2.8 V2 105mm, Takumar 120/2.8 120mm
Telephoto : Takumar 135/2.5 V1 135mm, Takumar 135/2.5 V2 135mm, Takumar 135/3.5 V1 135mm, Takumar 135/3.5 V2 135mm, Takumar 150/4 V1 150mm, Takumar 150/4 V2 150mm
Long tele : Takumar 200/3.5 200mm, Takumar 200/4 200mm, Takumar 200/5.6 200mm, Takumar 300/4 V1 300mm, Takumar 300/4 V2 300mm, Takumar 300/4 V3 300mm, Takumar 300/6.3 300mm, Takumar 400/5.6 400mm, Takumar 500/4.5 500mm, Takumar 500/5 500mm, Takumar 1000/8 V1 1000mm, Takumar 1000/8 V2 1000mm
Zoom : Zoom-Takumar 45~125/4 , Zoom-Takumar 70~150/4.5 , Zoom-Takumar 85~210/4.5 , Zoom-Takumar 135~600/6.7
Achromatic : Ultra-Achromatic-Takumar 85/4.5 , Ultra-Achromatic-Takumar 300/5.6 300mm |
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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| Posted: Thu Apr 14, 2011 5:54 pm Post subject: |
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Orio wrote:
Huge beast! And the first results seem promising.
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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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| Posted: Thu Apr 14, 2011 6:05 pm Post subject: |
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Spotmatic wrote:
| CarbonR wrote: |
| Apart from the sharpness that does not seem to be extreme, is it actually usable ? I mean, a 500/4 refractor gives a very thin dof, but a miror should give a thinner one, according to my experience with mirors. |
Probably the sharpness is also influenced by the fact that the interior is all but clean. In fact I expected much worse results! And is it really true that the DOF of a mirror lens is thinner than that from a 500mm f/4 telephoto?
| Orio wrote: |
| Huge beast! And the first results seem promising. |
Thank you! It's huge indeed, but fortunately not that heavy.
I forgot to add that I also got the matching "f=1000mm 1:8 attachment". That's what is engraved on it.
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Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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pich900
Joined: 10 Jun 2007
Posts: 1745
Location: The Netherlands/Zwolle
Expire: 2012-12-27
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| Posted: Thu Apr 14, 2011 6:59 pm Post subject: |
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pich900 wrote:
WOW Peter, what a monster lens  ......first results seems not so bad at all.....but I thought you were not a "miror lens guy "  .....
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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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| Posted: Thu Apr 14, 2011 7:02 pm Post subject: |
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Spotmatic wrote:
| pich900 wrote: |
| WOW Peter, what a monster lens ......first results seems not so bad at all.....but I thought you were not a "miror lens guy " ..... |
Indeed, now my words are being used against me 
But how could I resist this one, being cheaper than a 55mm f/1.8 SMC Takumar?
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Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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John Hill
Joined: 09 Jun 2011
Posts: 9
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| Posted: Thu Jun 09, 2011 11:44 am Post subject: |
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John Hill wrote:
Hi Peter
I have two of those and I expect neither is really as good as your example!
They are not identical, one has a pull out extender at the rear, I am not sure why but unless I pull that out I cannot get it to focus. The extender looks like what is on your lens. That one came to me from the estate of a scientist who worked in an observatory so it is quite possible he modified it some how.
The other lens was used by a wildlife photographer and shows signs of much use, but nothing I would call abuse. I could not reach the focus ring with my Pentax camera mounted so I made a disk to increase the diameter of the focus ring which made a world of difference. I have that leather lens cap cum stop down mask, I have even used it a few times.
I like mine as although huge to carry provided I can get something to lean against I can use them hand held without going to extremes of shutter speed. |
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Spotmatic
Joined: 18 Aug 2008
Posts: 4045
Location: Netherlands
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| Posted: Thu Jun 09, 2011 11:50 am Post subject: |
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Spotmatic wrote:
Hello and welcome, John!
I don't own the lens anymore; I sold it to a long lenses geek (for the same money as I have bought it for). He opened it up and cleaned it, and found out that there was some sort of coating defect in the front group. Apparently those old Sigmas are not really well built.
Do you have any shots to share?
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Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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John Hill
Joined: 09 Jun 2011
Posts: 9
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| Posted: Thu Jun 09, 2011 7:23 pm Post subject: |
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John Hill wrote:
I tried one out on this wild animal from down the road, Pentax *ist DS ISO 400 1/4000 hand held, f=500mm F1:4, distance about 35 metres. |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Thu Jun 09, 2011 9:54 pm Post subject: |
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Attila wrote:
Result is lot better what I did expect , from an inexpensive ultra fast 500mm mirror lens more than nice. How is it perform to long distance ?
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David
Joined: 13 Apr 2011
Posts: 1869
Location: Denver, Colorado
Expire: 2013-01-25
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| Posted: Thu Jun 09, 2011 11:31 pm Post subject: |
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David wrote:
SO here's a potentially dumb question:
If the lens cap can act as an f5.6 diaphragm, can you make make additional diaphragms to stop it down further and increase the DoF?
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ManuallyYours
Joined: 21 Jun 2012
Posts: 35
Location: Lyon, FRANCE
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| Posted: Tue Aug 14, 2012 10:13 pm Post subject: |
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ManuallyYours wrote:
Huge lens ! But results are not so promising... 
So light blur on details...
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ChromaticAberration
Joined: 23 Dec 2010
Posts: 819
Location: Portugal
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| Posted: Tue Aug 14, 2012 10:28 pm Post subject: |
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ChromaticAberration wrote:
| David wrote: |
SO here's a potentially dumb question:
If the lens cap can act as an f5.6 diaphragm, can you make make additional diaphragms to stop it down further and increase the DoF? |
I guess that should work I mean, on a "normal" lens you do just that, close the aperture, there is nothing else happening with the lens so I guess it makes perfect sense to assume that.
These samples are nice and I guess it makes no sense to make a truly awfull 500mm lens, budget or not this is a very specific tool only bought for using in very particular situations and so it is targeted at a niche market.
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leodp
Joined: 05 Jul 2013
Posts: 8
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| Posted: Fri Jul 05, 2013 10:50 am Post subject: |
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leodp wrote:
| David wrote: |
SO here's a potentially dumb question:
If the lens cap can act as an f5.6 diaphragm, can you make make additional diaphragms to stop it down further and increase the DoF? |
Sure you can stop it down by using smaller diameter diaphragms, it's something regularly done i.e. on hobby telescopes, to image for example the moon which may have too much light intensity compared to other sky objects.
What you cannot alter much (reduce) thou is the ring bokeh, because the central light ostruction cannot be decreased in size.
leodp |
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leodp
Joined: 05 Jul 2013
Posts: 8
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| Posted: Fri Jul 05, 2013 11:07 am Post subject: |
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leodp wrote:
| John Hill wrote: |
| I tried one out on this wild animal from down the road, Pentax *ist DS ISO 400 1/4000 hand held, f=500mm F1:4, distance about 35 metres. |
John, the cat does not look so sharp. How did you image it?
This lens is almost a telescope: if you do not give it time to adapt to temperature changes (i.e. when you are taking the lens from home to a sunny place outside) I suspect that the resolution is going to be pretty low, not reflecting the real performance achievable.
It would be nice to see a comparison of a shot taken immediately upon going on field and after the lens has settled 1 hour or so.
Leo |
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John Hill
Joined: 09 Jun 2011
Posts: 9
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| Posted: Thu Sep 05, 2013 10:17 am Post subject: |
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John Hill wrote:
| leodp wrote: |
| John Hill wrote: |
| I tried one out on this wild animal from down the road, Pentax *ist DS ISO 400 1/4000 hand held, f=500mm F1:4, distance about 35 metres. |
John, the cat does not look so sharp. How did you image it?
This lens is almost a telescope: if you do not give it time to adapt to temperature changes (i.e. when you are taking the lens from home to a sunny place outside) I suspect that the resolution is going to be pretty low, not reflecting the real performance achievable.
It would be nice to see a comparison of a shot taken immediately upon going on field and after the lens has settled 1 hour or so.
Leo |
Leo, as far as I recall that is full frame with no processing at all. |
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John Hill
Joined: 09 Jun 2011
Posts: 9
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| Posted: Thu Sep 05, 2013 10:18 am Post subject: |
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John Hill wrote:
| leodp wrote: |
| John Hill wrote: |
| I tried one out on this wild animal from down the road, Pentax *ist DS ISO 400 1/4000 hand held, f=500mm F1:4, distance about 35 metres. |
John, the cat does not look so sharp. How did you image it?
This lens is almost a telescope: if you do not give it time to adapt to temperature changes (i.e. when you are taking the lens from home to a sunny place outside) I suspect that the resolution is going to be pretty low, not reflecting the real performance achievable.
It would be nice to see a comparison of a shot taken immediately upon going on field and after the lens has settled 1 hour or so.
Leo |
Leo, as far as I recall that is full frame with no processing at all. |
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John Hill
Joined: 09 Jun 2011
Posts: 9
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| Posted: Thu Sep 05, 2013 10:18 am Post subject: |
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John Hill wrote:
| leodp wrote: |
| John Hill wrote: |
| I tried one out on this wild animal from down the road, Pentax *ist DS ISO 400 1/4000 hand held, f=500mm F1:4, distance about 35 metres. |
John, the cat does not look so sharp. How did you image it?
This lens is almost a telescope: if you do not give it time to adapt to temperature changes (i.e. when you are taking the lens from home to a sunny place outside) I suspect that the resolution is going to be pretty low, not reflecting the real performance achievable.
It would be nice to see a comparison of a shot taken immediately upon going on field and after the lens has settled 1 hour or so.
Leo |
Leo, as far as I recall that is full frame with no processing at all. |
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John Hill
Joined: 09 Jun 2011
Posts: 9
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| Posted: Thu Sep 05, 2013 10:20 am Post subject: |
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John Hill wrote:
| leodp wrote: |
| John Hill wrote: |
| I tried one out on this wild animal from down the road, Pentax *ist DS ISO 400 1/4000 hand held, f=500mm F1:4, distance about 35 metres. |
John, the cat does not look so sharp. How did you image it?
This lens is almost a telescope: if you do not give it time to adapt to temperature changes (i.e. when you are taking the lens from home to a sunny place outside) I suspect that the resolution is going to be pretty low, not reflecting the real performance achievable.
It would be nice to see a comparison of a shot taken immediately upon going on field and after the lens has settled 1 hour or so.
Leo |
Leo, as far as I recall that is full frame with no processing at all. |
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