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The other Solid Cat - Vivitar Series 1 800mm
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PostPosted: Sun Nov 27, 2022 4:33 pm    Post subject: Reply with quote
paulhofseth wrote:
It is worth keeping in mind that light journeys between main mirror and secondary before heading for the rear correction optics, so any small misadjustment to the lightpath gets multiplied.

User attempts to remove dust may totally destroy any initial precision adjustment just like the usual knocks and bumps that equipment is usually exposed to, so less sturdy or those with signs of having been opened (e.g.minor scuffs on screws)should be avoided if not tested.

However, unsharp long telesnaps are not just caused by unstable camera support or bad focussing, but mey well come from unruly air movenments-

p.


Correct! I have taken apart my two Makinon mirrors to clean and made them worse. I examine mirrors carefully when considering a purchase to judge whether or not they have been opened. I don't even trust repair shops because of the criticality of alignment. Collimation is no simple thing. After buying a Nikon and having a great experience with it, my friend and shooting buddy bought one that did not match mine in sharpness. I looked at it carefully and found evidence that the rear had been opened. He returned it and found another with no evidence of having been opened and it matched mine in performance. I have far too many mirrors already but still consider a very few that I would like to try. I am very careful to look for signs of servicing and damage from dropping.


PostPosted: Sun Nov 27, 2022 4:47 pm    Post subject: Reply with quote
europanorama wrote:
if you mention brands pls mention which lens. e.g. which sigma meant.
I have more data of both 500/4 and yashica telling when they went out of production. something early 80ties. price mentioned.


Yes, especially with regard to Sigma. There seem to have been several versions of the 8/600. My Sigma experience has been with the 8/600 and 5.6/400. I accidentally acquired four copies of the 5.6/400 with only one being bad because of corrosion on the reflective surface. They all had minor issues around the very outer edges of the mirror, probably due to the adhesive eating through the reflective coating, but that didn't affect the images. The 400mm performs well and I used it a lot before Getting the Tamron SP 350 and then the Vectis 400. The Sigma 400 is a good lens at a very low price. As stated before, the 600 is a crap shoot. Both 400 and 600 are susceptible to corrosion of mirror surfaces more so than most other brands.

The Yashica, in my experience, is a good mirror but not a great mirror. The ML version did not live up to my expectations. I had a better experience with one of the early versions of the Spiratone (Tomioka) equivalent of one of the Yashica versions.

I have no experience with the 4/500 but have read comments and know of someone who has one. I have not seen any good reports so far.


PostPosted: Mon Nov 28, 2022 11:05 am    Post subject: Reply with quote
haved used highgloss paper to print the bird-shots in park above all the greyreiher(grey....) on the shadow.
unsure if i can scan highgloss. had bad experience with this panorama-glossy contact. original in color. but glossy. highgloss? maybe confusive to post link if someone likes go to auschwitzpanorama dot ch and see reflexion at center-enter of court. dont know yet scanning workaround. maybe camera and stitching 6 x41cm contact.
just opened noname 300/5.6. very bad unsharp results. couldnt find screw to adjust anything maybe glued.
rotation has a dent. will not use it maybe for emergencies. getting the tamron 350.mbar right?


PostPosted: Mon Nov 28, 2022 4:20 pm    Post subject: Reply with quote
europanorama wrote:
haved used highgloss paper to print the bird-shots in park above all the greyreiher(grey....) on the shadow.
unsure if i can scan highgloss. had bad experience with this panorama-glossy contact. original in color. but glossy. highgloss? maybe confusive to post link if someone likes go to auschwitzpanorama dot ch and see reflexion at center-enter of court. dont know yet scanning workaround. maybe camera and stitching 6 x41cm contact.
just opened noname 300/5.6. very bad unsharp results. couldnt find screw to adjust anything maybe glued.
rotation has a dent. will not use it maybe for emergencies. getting the tamron 350.mbar right?


I'm sorry, I did not follow all of what you said/asked. I have done little scanning, so not an expert. My scanning has been limited to negatives and slides for which I use a Minolta DimAge Scan Elite 5400. It's old by very good for my needs. Beyond that, I have done everything digital for the past two decades.

Concerning the 5.6/300, as I indicated earlier, some are better than others. The Tamron SP 350 is a very good lens but also quite expensive. It is not surprising that cost reflects quality. However, the SP 350 often has coating separation of the rear element. Be careful to watch for that. I was able to purchase one inexpensively because of some separation but found that it has zero impact on images. Still, I wouldn't buy one unless the separation was minimal or non-existent.

I have posted SP350 images here: http://forum.mflenses.com/400mm-mirror-lenses-and-350mm-and-450mm-t83101,highlight,%2Bmirror.html and this thread shows my early through final experiences with the 300mm mirrors: http://forum.mflenses.com/300mm-mirror-lenses-t77672,highlight,%2Bmirror.html


PostPosted: Mon Nov 28, 2022 5:57 pm    Post subject: Reply with quote
Some 800mm images from yesterday.


#1


#2


PostPosted: Mon Nov 28, 2022 8:28 pm    Post subject: mirror with aperture GOEMA german Reply with quote
Schiefspiegler Katoptar by Goema. was a very strange rectangularly shaped mirror-lens. most important: had apertures results were not that satisfactory maybe the reason it didnt find to large circulation. there must be a report online. and i have images somewhere under my papers. hard to find. but i WILL find one day.
https://olypedia.de/index.php?title=Spiegelobjektiv


PostPosted: Tue Nov 29, 2022 11:15 pm    Post subject: Re: mirror with aperture GOEMA german Reply with quote
europanorama wrote:
Schiefspiegler Katoptar by Goema. was a very strange rectangularly shaped mirror-lens. most important: had apertures results were not that satisfactory maybe the reason it didnt find to large circulation. there must be a report online. and i have images somewhere under my papers. hard to find. but i WILL find one day.
https://olypedia.de/index.php?title=Spiegelobjektiv


This was an off-axis portion cut out of a two-mirror, on-axis classical Cassegrain telescope. Think about taking a typical 500mm f8 mirror lens and masking the front so only an off-axis portion is left.

Now if you did that, think about how little aperture you'd have left for the focal length. As you can see, in order to get an off-axis 500mm f/8 portion of aperture, the original Cassegrain would have to have a pretty large aperture which at 500mm would make it quite fast overall. And this Goema used expensive Zerodur mirrors too.



This lens was short because the on-axis classical Cassegrain it was cut from, also happens to be short (telephoto design).

But the popularised 'Schiefspiegler' tilted component telescope designed by Anton Kutter is different. "One may think of it as an off axis segment of a Cassegrain, but rather than having the fast primary (typically f/2 to f/4) and high secondary magnification (typically 3 to 4 times) of the normal Cassegrain, the Schiefspiegler has a long focal ratio for the primary (typically around f/15) and a smaller secondary magnification (typically 1.6x)."
http://spider.seds.org/scopes/Add/mv-schief.html

"Schiefspiegler" just means 'oblique mirror' in German.

Last edited by eggplant on Wed Nov 30, 2022 12:08 am; edited 1 time in total


PostPosted: Tue Nov 29, 2022 11:43 pm    Post subject: Reply with quote
Most impressive sharpness, woodrim. The IBS of the Sony A7 seems to work very well, indeed. Your skillset blows me away.

I have 4 mirror lenses:

Tamron 350mm f:5.6, Tamron 500mm f/8, Vivitar Series 1 600mm f/8, and the very rare Perkin-Elmer 600mm f/8. The Perkin Elmer appears to be essentially the same lens as the Vivitar, which makes sense as P-E made both lenses.

Somewhere I've got a series of interviews with the designer of the Solid Cat, Juan Rayces, whose memories vary very substantially from the advertised hype Ponder and Best put out.

Both the Tamrons and the Solid Cats are good lenses and at first I believed them to have similar performance. However, after obtaining a truly massive Bogen/Manfrotto tripod and using the mirror lockup on my F-1, I was able to see a definite edge of these American lenses over the Japanese ones.


PostPosted: Tue Nov 29, 2022 11:59 pm    Post subject: Reply with quote
Huffy49 wrote:
Most impressive sharpness, woodrim. The IBS of the Sony A7 seems to work very well, indeed. Your skillset blows me away.

I have 4 mirror lenses:

Tamron 350mm f:5.6, Tamron 500mm f/8, Vivitar Series 1 600mm f/8, and the very rare Perkin-Elmer 600mm f/8. The Perkin Elmer appears to be essentially the same lens as the Vivitar, which makes sense as P-E made both lenses.

Somewhere I've got a series of interviews with the designer of the Solid Cat, Juan Rayces, whose memories vary very substantially from the advertised hype Ponder and Best put out.

Both the Tamrons and the Solid Cats are good lenses and at first I believed them to have similar performance. However, after obtaining a truly massive Bogen/Manfrotto tripod and using the mirror lockup on my F-1, I was able to see a definite edge of these American lenses over the Japanese ones.


Thank you, Huffy49. IBIS is critical as is the magnification feature for focusing. You purchased well; the SP350 is very good and the 500mm is a consistent performer with good close-up ability. It seems you avoided the junk that's out there with tempting prices. I too would expect the PE to be virtually the same as the VS1 600. However, I am very curious about what you said regarding Mr. Rayces memory vs the advertising.


PostPosted: Thu Dec 15, 2022 9:46 am    Post subject: Reply with quote
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