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500mm Mirror Lenses
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PostPosted: Wed May 02, 2018 4:03 am    Post subject: Reply with quote

Happy Dog Like Dog Like 1 Friends


PostPosted: Thu May 03, 2018 10:32 pm    Post subject: Reply with quote

Abbazz wrote:
woodrim wrote:
The lens is Spiratone Minitel-M, the later version with macro and serial number starting with 81, and without the tripod mount. There is an interesting read here: http://www.subclub.org/Tomioka.pdf

Very interresting read, thank you for sharing it. I wonder whether the 300mm Spiratone Minitel-S was made by Tomioka too...

Cheers!

Abbazz


Hmm, just got one, hazy on the rear lens group, but easy to clean. Some idio.. err "less knowledgeable person" had
jammed a T-mount ring on the M42 rear mount, removed that and it seems to do well now. It is the version with macro focusing down to 1.7 meters, also serial no 81xxxx. Will take it for a walk soon...


PostPosted: Fri May 04, 2018 5:02 am    Post subject: Reply with quote

kds315* wrote:
Hmm, just got one, hazy on the rear lens group, but easy to clean. Some idio.. err "less knowledgeable person" had
jammed a T-mount ring on the M42 rear mount, removed that and it seems to do well now. It is the version with macro focusing down to 1.7 meters, also serial no 81xxxx. Will take it for a walk soon...

Did you get the 300 or the 500mm Spiratone reflector?

Cheers!

Abbazz


PostPosted: Fri May 04, 2018 6:47 am    Post subject: Reply with quote

Abbazz wrote:
kds315* wrote:
Hmm, just got one, hazy on the rear lens group, but easy to clean. Some idio.. err "less knowledgeable person" had
jammed a T-mount ring on the M42 rear mount, removed that and it seems to do well now. It is the version with macro focusing down to 1.7 meters, also serial no 81xxxx. Will take it for a walk soon...

Did you get the 300 or the 500mm Spiratone reflector?

Cheers!

Abbazz


The 8/500mm Minitel-M Pluracoat with T-mount I got with "macro" focusing ability.


PostPosted: Fri May 04, 2018 1:50 pm    Post subject: Reply with quote

kds315* wrote:
Abbazz wrote:
kds315* wrote:
Hmm, just got one, hazy on the rear lens group, but easy to clean. Some idio.. err "less knowledgeable person" had
jammed a T-mount ring on the M42 rear mount, removed that and it seems to do well now. It is the version with macro focusing down to 1.7 meters, also serial no 81xxxx. Will take it for a walk soon...

Did you get the 300 or the 500mm Spiratone reflector?

Cheers!

Abbazz


The 8/500mm Minitel-M Pluracoat with T-mount I got with "macro" focusing ability.


I'll be curious how well you fo with it, Klaus. Remember, focus is critical. I don't recall which mirrors you have to compare to but if you have any of the good ones, you will see a difference when enlarging the image. My post was not intended to be a promotion of the Spiratone but if others can get the same results, they can have some cheap fun. Good luck.


PostPosted: Fri May 04, 2018 3:13 pm    Post subject: Reply with quote

woodrim wrote:
kds315* wrote:
Abbazz wrote:
kds315* wrote:
Hmm, just got one, hazy on the rear lens group, but easy to clean. Some idio.. err "less knowledgeable person" had
jammed a T-mount ring on the M42 rear mount, removed that and it seems to do well now. It is the version with macro focusing down to 1.7 meters, also serial no 81xxxx. Will take it for a walk soon...

Did you get the 300 or the 500mm Spiratone reflector?

Cheers!

Abbazz


The 8/500mm Minitel-M Pluracoat with T-mount I got with "macro" focusing ability.


I'll be curious how well you fo with it, Klaus. Remember, focus is critical. I don't recall which mirrors you have to compare to but if you have any of the good ones, you will see a difference when enlarging the image. My post was not intended to be a promotion of the Spiratone but if others can get the same results, they can have some cheap fun. Good luck.


Yes, I know. I don't have many mirrors, a few very special ones for UV photography, but none of the very good and expensive ones like the Mirotar etc.

I'll test it soon and we'll see...


PostPosted: Tue May 15, 2018 10:53 pm    Post subject: Reply with quote

Saturday, I will be using the Rubinar 5.6/500 at the swamp. This picture is a sunset walk along the swamp's edge. Maksutov
3M-6A 6.3/500



PostPosted: Wed May 16, 2018 12:34 am    Post subject: Reply with quote

Beautiful picture!

In capable hands, mirror lenses are definitely capable of delivering superb pictures with an unmistakable mood. Of course their definition is not on par with modern refractor lenses and their bokeh can be weird sometimes, but they certainly don't lack character. Thank you for having proved it again and again in this thread.

Cheers!

Abbazz


PostPosted: Wed May 16, 2018 2:31 am    Post subject: Reply with quote

Abbazz wrote:
Beautiful picture!

In capable hands, mirror lenses are definitely capable of delivering superb pictures with an unmistakable mood. Of course their definition is not on par with modern refractor lenses and their bokeh can be weird sometimes, but they certainly don't lack character. Thank you for having proved it again and again in this thread.

Cheers!

Abbazz


Thank you, Abbazz. It is that character that hooked me along with the challenge of using these lenses. I was all about sharpness until I discovered that some great overall image character came more from lenses that gave up some sharpness. My love for Meyer glass was first and still is, but I have really connected with a few of the high-quality mirrors. I don't compare sharpness with refractors because mirrors are to be appreciated for what they offer and accepted for what they don't. A properly focused mirror image is more than satisfactory. The donut bokeh will remain the greatest challenge and I do give consideration to backgrounds whenever possible. I have learned how to minimize the donut effect. Thank you again for your comments. I sure hope the Rubinar lives up to the big Mak.


PostPosted: Wed May 16, 2018 4:01 am    Post subject: Reply with quote

It's not as sharp as I would expect. Is there some mitigating factor - some slight camera shake or imperfect focus on the bird? Or is that how sharp that lens is?


PostPosted: Mon May 21, 2018 3:20 pm    Post subject: Reply with quote

Ut oh. My new Rubinar 5.6/500 has astigmatism.[/img]


PostPosted: Mon May 21, 2018 6:58 pm    Post subject: Reply with quote

iangreenhalgh1 wrote:
It's not as sharp as I would expect. Is there some mitigating factor - some slight camera shake or imperfect focus on the bird? Or is that how sharp that lens is?


The shot is @ 500mm, f/6.3. If Woodrim is on a full frame sensor, with a shot this close, the focal plane is less than (really need subject distance to get precise) 6 inches--not nearly enough to place a subject like this (blue Heron) entirely in the focal plane. Also, nailing focus with these lenses is beyond my ability to describe--you have to try it. To answer your question more succinctly: the lens is much sharper than you suspect. This is supported by other images. But Woodrim is describing something beyond sharpness--read his comments subsequent to this shot. JT