Seeking info re MF Minolta RF Rokkor-X 500 f/8 mirror lens

A long shot, but you could try:

Mr Kim Smith
Phototronic Services Ltd
328 Broadway Avenue,
Terrace End,
Palmerston North,
New Zealand 4410

http://www.phototronic.co.nz/

Kim has been associated with Minolta Camera Products for a very long time and often works minor miracles to help us keep our Alpha mount gear alive.

Tel: +64 6 358 9085
Fax: +64 6 355 5446

NB: NZ is 12 hours + GMT!
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Sonnarman

I had one of the Rokkors. I recall reading somewhere that not having the rear filter in place had no adverse effect on IQ.
One of my faves with that lens on my Sony A850:

Dan
--
http://danlennerphotos.smugmug.com/

To my understanding there are no problem that you miss the UV rear filter. The front filter tread are 77mm and much better idea as it protect the front element. When a filter between lens and sensor is taken away, you only reduce focal lenght with the tickness of the filter glass. For a wide angle this can change focus, but not for a long telephoto lens.

At Ebay today it is an offer of a rear filter for Rokkor 500mm 8.

You could buy it just for comfort.

Norfoot

William Ing wrote:

Please pardon me if I should have posted the following question in another forum, but "Konica-Minolta" seemed most appropriate: I recently bought a used Minolta RF Rokkor-X 500mm f/8 manual focus mirror lens from KEH. I have it mounted on an Olympus OM-D EM-5 body, and, given the new Olympus' surprisingly effective IBIS, have gotten some pretty decent handheld results in outdoor light.

Unfortunately, the lens was missing the rear-mounted screw-in UV filter that was part of the standard accessory filter kit originally included with new lenses. Question: I understand that, as with most drop-in or rear-mounted filters, the missing UV filter is factored in as one of the elements of the original lens design. In practice, is the optical performance of the Rokkor seriously compromised by lack of this filter? And secondly, can anyone suggest where I might inquire about acquiring the four-filter set and the metal key used for installing/removing the filter?

Thanks for any help of suggestions you can give.

William Ing wrote:

Please pardon me if I should have posted the following question in another forum, but "Konica-Minolta" seemed most appropriate: I recently bought a used Minolta RF Rokkor-X 500mm f/8 manual focus mirror lens from KEH. I have it mounted on an Olympus OM-D EM-5 body, and, given the new Olympus' surprisingly effective IBIS, have gotten some pretty decent handheld results in outdoor light.

Unfortunately, the lens was missing the rear-mounted screw-in UV filter that was part of the standard accessory filter kit originally included with new lenses. Question: I understand that, as with most drop-in or rear-mounted filters, the missing UV filter is factored in as one of the elements of the original lens design. In practice, is the optical performance of the Rokkor seriously compromised by lack of this filter? And secondly, can anyone suggest where I might inquire about acquiring the four-filter set and the metal key used for installing/removing the filter?

Thanks for any help of suggestions you can give.

Answer from Norfoot.
In a 500mm mirror lens its less need to use the rear filter, but use it if its there. Any filter inside a lens or behind will be a part of the focal length. Most mirror or large lenses can change lenght when heatet and oposite in cold. Big lenses and normally mirror lenses has optical infinity before infinity mark. That can cover the change also when removing a buildt in filter. If you instead remove a filter as inside in a short focal lens as a 24mm wide, than you might block infinity untill you put filter back.
About mirror lens sharpness,: Most lenses from a camera producer is sharp. At the other side many from trading firms are not sharp. They are just cheap.
Of more than 20 bought mirror lenses I found Minolta, Olympus and RTM Tokina as superior. I know Canon FD is good also. Pentax reflex zoom 400-600/8-12 is sharp at 400 and get softer and darker at 600mm. Mirror lenses can easy be affected from side light. Use Always a long sunshade/lensshade for mirror lenses.

William Ing wrote:

Please pardon me if I should have posted the following question in another forum, but "Konica-Minolta" seemed most appropriate: I recently bought a used Minolta RF Rokkor-X 500mm f/8 manual focus mirror lens from KEH. I have it mounted on an Olympus OM-D EM-5 body, and, given the new Olympus' surprisingly effective IBIS, have gotten some pretty decent handheld results in outdoor light.

Unfortunately, the lens was missing the rear-mounted screw-in UV filter that was part of the standard accessory filter kit originally included with new lenses. Question: I understand that, as with most drop-in or rear-mounted filters, the missing UV filter is factored in as one of the elements of the original lens design. In practice, is the optical performance of the Rokkor seriously compromised by lack of this filter? And secondly, can anyone suggest where I might inquire about acquiring the four-filter set and the metal key used for installing/removing the filter?

Thanks for any help of suggestions you can give.

Here. Something did happen by error.

I wrote this list under but must have missed giving answer to a question

The Minolta RF 500mm8 is my most used over 300mm. Its very sharp when correct used with lenshood. You dont need to use the rear filter. Its a part of the optical focus, but most mirror lenses focus well past infinity. It will not give a problem. Because of having sharp mirror lenses I don't use much as the Sigma 50-500mm. I use mostly MINOLTA RF 250/5.6, RF500/8 or Olympus OM 500/8 RF.

If you have a good camera easy to focus manuell and in body picture stabilisation, than a good mirror lens is a handy solution for always in your bag.

William Ing wrote:

Please pardon me if I should have posted the following question in another forum, but "Konica-Minolta" seemed most appropriate: I recently bought a used Minolta RF Rokkor-X 500mm f/8 manual focus mirror lens from KEH. I have it mounted on an Olympus OM-D EM-5 body, and, given the new Olympus' surprisingly effective IBIS, have gotten some pretty decent handheld results in outdoor light.

Unfortunately, the lens was missing the rear-mounted screw-in UV filter that was part of the standard accessory filter kit originally included with new lenses. Question: I understand that, as with most drop-in or rear-mounted filters, the missing UV filter is factored in as one of the elements of the original lens design. In practice, is the optical performance of the Rokkor seriously compromised by lack of this filter? And secondly, can anyone suggest where I might inquire about acquiring the four-filter set and the metal key used for installing/removing the filter?

Thanks for any help of suggestions you can give.

The rear filter might be 39mm and than similar to Nikon and other. It dont affect sharpness, but it decrease the focal lenght with thickness of the missing filter glass. Teoretical it can disturb infinity, but mirror lenses use to focus well passed infinity because infinity change with temperature. I think all is in full order also with no rear mounted filter. Just remember to focus in camera also when "infinity" motives..! Always use a good (long) sunshade for mirror lenses.

Norfoot

I list some of my equipment. *star means most used.
*Pentax K3iis, Pentax K-5.
*DA12-24/4, *16-45/4, DAL 18-50/3.5-5.6,
*FA80-320/4.5-5.6, Sigma 50-500/4-6.3 + 1.4x conv.
*Tokina at-x 24-200/3.5-5.6, Tokina at-x 80-200/2.8.
Schneider Kreuznach 80-240/4, +Pentax Af converter 1.7x
*FA85mm1.4, FA50mm1.4, *FA100mm3.5 macro
*Minolta RF 250/5.6, *Minolta RF 500/8, Tokina RMC 500/8
*Olympus RF 500/8, Nikkor 500/5, Zoomar Reflextar 500/5.6
Super light walk around :

Olympus Pen Lite (Olympus OM M5)Lumix G Vario 12-32/3.5-5.6, 35-100/4-5.6, 45-175/4-5.6  Minolta 250mm5.6, Olympus 500mm8

norfoot wrote:

William Ing wrote:

Please pardon me if I should have posted the following question in another forum, but "Konica-Minolta" seemed most appropriate: I recently bought a used Minolta RF Rokkor-X 500mm f/8 manual focus mirror lens from KEH. I have it mounted on an Olympus OM-D EM-5 body, and, given the new Olympus' surprisingly effective IBIS, have gotten some pretty decent handheld results in outdoor light.

Unfortunately, the lens was missing the rear-mounted screw-in UV filter that was part of the standard accessory filter kit originally included with new lenses. Question: I understand that, as with most drop-in or rear-mounted filters, the missing UV filter is factored in as one of the elements of the original lens design. In practice, is the optical performance of the Rokkor seriously compromised by lack of this filter? And secondly, can anyone suggest where I might inquire about acquiring the four-filter set and the metal key used for installing/removing the filter?

Thanks for any help of suggestions you can give.

The rear filter might be 39mm and than similar to Nikon and other. It dont affect sharpness, but it decrease the focal lenght with thickness of the missing filter glass. Teoretical it can disturb infinity, but mirror lenses use to focus well passed infinity because infinity change with temperature. I think all is in full order also with no rear mounted filter. Just remember to focus in camera also when "infinity" motives..! Always use a good (long) sunshade for mirror lenses.

Norfoot

I list some of my equipment. *star means most used.
*Pentax K3iis, Pentax K-5.
*DA12-24/4, *16-45/4, DAL 18-50/3.5-5.6,
*FA80-320/4.5-5.6, Sigma 50-500/4-6.3 + 1.4x conv.
*Tokina at-x 24-200/3.5-5.6, Tokina at-x 80-200/2.8.
Schneider Kreuznach 80-240/4, +Pentax Af converter 1.7x
*FA85mm1.4, FA50mm1.4, *FA100mm3.5 macro
*Minolta RF 250/5.6, *Minolta RF 500/8, Tokina RMC 500/8
*Olympus RF 500/8, Nikkor 500/5, Zoomar Reflextar 500/5.6
Super light walk around :

Olympus Pen Lite (Olympus OM M5)Lumix G Vario 12-32/3.5-5.6, 35-100/4-5.6, 45-175/4-5.6 Minolta 250mm5.6, Olympus 500mm8

You do realise that the OP asked this question in 2012 ( 11 years ago ! ) ?

And hasn't been on the forums since 2016 ( 5 years ago ! ) , And it was already a long dead thread then when you dug it up !

Zombie alert !

Assuming they are still alive , I would imagine they worked things out of moved on from then .

I'm guessing that's why while you've been posting in this thread these last few months , there's been no response to you.

Regards .