Author Topic: Gelatin filters for Sony/Minolta Reflex mirror lens?  (Read 2042 times)

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Offline balacau

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Gelatin filters for Sony/Minolta Reflex mirror lens?
« on: November 29, 2010, 12:49:39 PM »
I've never even looked at gelatin filters before.  When bought new, the Sony 500mm mirror lens is supplied with a "normal" and an ND4 gelatin filter; inserted into the rear of the lens.

Are these filters available from anywhere since the lens has been discontinued?  Can you get other types apart from the "normal" and ND4 types?

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Gavin
a580 dSLR & a55 dSLT and a bundle of lenses to keep me happy

Offline JimA

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Re: Gelatin filters for Sony/Minolta Reflex mirror lens?
« Reply #1 on: November 29, 2010, 02:48:31 PM »
dont think they are gelatin just small glass filters that screw into the special carrier
My Sigma mirro came with yellow and red ones ass well to enhance contrast with black and white film


Offline balacau

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Re: Gelatin filters for Sony/Minolta Reflex mirror lens?
« Reply #2 on: November 29, 2010, 04:07:07 PM »
I did see a Sigma mirror lens (600mm?) on eBay a while ago; manual focus though.

Is a full range of special filter kinds available for mirror lenses too (IR, ND8, polarising, 0-haze etc) or are they too specialised to warrant such options?  Perhaps just because of their design they are unsuitable.

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Gavin
a580 dSLR & a55 dSLT and a bundle of lenses to keep me happy

Offline JimA

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Re: Gelatin filters for Sony/Minolta Reflex mirror lens?
« Reply #3 on: January 21, 2011, 07:49:49 PM »
Not sure if polarising would work with mirror - and would be difficult to turn the small rear filter

My sigma 600 mirror did have a screw thread on the front pretty big though and was mainly for the hood Never saw any filters that size

Offline LordGromit

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Re: Gelatin filters for Sony/Minolta Reflex mirror lens?
« Reply #4 on: January 22, 2011, 09:43:49 AM »
Not sure the 500 reflex is discontinued. The UK Sony site still shows it, although only rear lens cap accessory available, no filters.
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Offline balacau

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Re: Gelatin filters for Sony/Minolta Reflex mirror lens?
« Reply #5 on: January 22, 2011, 06:28:52 PM »
I finally figured out where I was getting confused, there are gelatin filters available, but for fisheye lenses; not for the mirror. 

As for the mirror not showing it being a discontinued lens, Sigma UK site still had their former 180mm macro lens on the site for some time (weeks/months?) before it was removed.  If you are seriously after a lens from Sony and have any doubts about if its still in production; it might be better going straight to Sony and asking them.  Get the "official" word, so to speak.  I have seen on at least one site that its now discontinued however so it just may be a site update which is pending.

Best regards

Gavin
a580 dSLR & a55 dSLT and a bundle of lenses to keep me happy

Offline AScot

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Re: Gelatin filters for Sony/Minolta Reflex mirror lens?
« Reply #6 on: February 03, 2011, 12:58:25 AM »
The filters (clear and ND4) that come with the Sony/Minolta reflex lenses are called drop in filters and they are glass. I once found some for sale on ebay but they were very expensive and they are now very scarce.

The front of the Reflex lens has an 82mm thread and will accept any 82mm filter. The lens hood will then screw onto the front thread of the filter. I have tried this with the 82mm clear filter that comes with the Minolta 300mm f4 HS APO with no problems. The drop in filters for that lens do not fit the reflex and are even more scarce and VERY expensive, $300 to $400 for a C. Pol.

I am almost sure that Circ Polarizers will work on the reflex, but not certain. Turning the 82mm filter is no problem, just turn the hood or leave the hood off. However, lengthening the hood by the thickness of a filter may cause some vignetting. The only filter I have any real doubt about is an IR. The 82mm filters are, I think, the largest of the easily available and reasonably cheap filters available.
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Offline Fud

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Re: Gelatin filters for Sony/Minolta Reflex mirror lens?
« Reply #7 on: February 03, 2011, 10:25:36 AM »
Not exactly sure why you would want to put an ND4 filter on the 500mm mirror lens as normally it is not having enough light that is the problem not too much.  I actually have one of those rare 42mm circular polariser drop in filter for the 600mm (and you don't want to know how much it cost ;) ) but very rarely use it as getting enough light is more of a problem so I don't want to drop a couple of stops by having the filter on.
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Re: Gelatin filters for Sony/Minolta Reflex mirror lens?
« Reply #7 on: February 03, 2011, 10:25:36 AM »