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Should I get all three 50mm lenses

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balacau View Drop Down
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Post Options Post Options   Quote balacau Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2019 at 10:47
That surprises me to read such comments concerning the Sigma 105mm macro. This was supposedly a highly rated macro lens (especially for a mount users). Issues with gears and earlier Sigma lenses aren't something I'm unfamiliar with either, my 50-500mm stripped it's gears twice. It might have been worth selling the 105mm as a parts or donor lens though. Seems to be a decent market on ebay for those.

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Phil Wood View Drop Down
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2019 at 17:32
Originally posted by LAbernethy LAbernethy wrote:

... For me it's a best and worst situation. My Minolta AF 50mm 1:2.8 Macro is my favorite macro lens and my Minolta AF 50mm 1:2.8 Macro RS is my worst performing macro lens; ...

A bit worrying; I ordered a 50mm f2.8 RS hoping for 50mm f2.8 performance plus focus limiter and the lens button. Thankfully it was not too pricey!

When I pick it up next week I shall be very interested to see how it performs.

The bokeh shots interesting, but somewhat superfluous - if I want to isolate a subject with a smooth background I will use my 1.4 at 1.4 or my 1.7 at 1.7 not a 2.8 RS or either of the others at 2.8. To me the bottom line is 1.4 for bokeh, 2.8 for sharpness, 1.7 for fun. I prefer them all to the Sony DT 1.8.

The OP has the 1.4 and 2.8 (1985 versions, pre RS), the question is what is to be gained from adding a 1.7 (1985) and the answer is, in reality, 'not a lot' - unless you are interested in doing lens comparisons or just want a bigger lens collection.
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LAbernethy View Drop Down
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Post Options Post Options   Quote LAbernethy Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2019 at 00:31
Originally posted by balacau balacau wrote:

That surprises me to read such comments concerning the Sigma 105mm macro. This was supposedly a highly rated macro lens (especially for a mount users). Issues with gears and earlier Sigma lenses aren't something I'm unfamiliar with either, my 50-500mm stripped it's gears twice. It might have been worth selling the 105mm as a parts or donor lens though. Seems to be a decent market on ebay for those.


I think the HSM model is highly rated. I think this particular lens was an unsuccessful rebuild and would feel bad passing it on.
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LAbernethy View Drop Down
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Post Options Post Options   Quote LAbernethy Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2019 at 00:39
Originally posted by Phil Wood Phil Wood wrote:

Originally posted by LAbernethy LAbernethy wrote:

... For me it's a best and worst situation. My Minolta AF 50mm 1:2.8 Macro is my favorite macro lens and my Minolta AF 50mm 1:2.8 Macro RS is my worst performing macro lens; ...

A bit worrying; I ordered a 50mm f2.8 RS hoping for 50mm f2.8 performance plus focus limiter and the lens button. Thankfully it was not too pricey!

When I pick it up next week I shall be very interested to see how it performs.


My experience with the RS put me off picking up the Sony version and opted for a Tamron 90mm 2.8 macro to replace my Sigma.
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balacau View Drop Down
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Post Options Post Options   Quote balacau Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2019 at 11:46
I wonder if the PRE-HSM version has a different optical construction then?

This discussion has got me thinking if it's worthwhile me I vesting in one of the Minolta 50mm lenses even though I already have the Sony SAL50F18, Samyang 50mm and the Tamron 45mm. I'm not sure if it's lens lust or simple curiosity so I'll chalk it up to the latter of the two.
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2019 at 13:32
When comparing bokeh the results can be highly variable with focus distance and with background distance and background type. IME grass isn't usually the worst test as the contrast edges are often low, whereas twigs (especially with strong top or side lighting) are just about the worst, when the amount of defocus matches the periodicity of the background detail.

The situation is different again when you focus close and deliberately put distant streetlights/Christmas lights a *lot* out of focus to get circles, especially since so many lenses crop the circles to cat's eyes, and by a variable amount.

I will stick to my own observation that with an APS-C sensor the Minolta 50mm f1.7 gives some of the best OOF circles over most of the frame on distant lights, with no trace of onion rings, but I haven't tried the Sigma 50mm. The smoothest 'STF-like' transition focus (close background) I've seen was on the cheap late 35-105mm at full aperture, though the lens is pretty awful in many other respects!
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
 



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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2019 at 16:57
Originally posted by balacau balacau wrote:

I wonder if the PRE-HSM version has a different optical construction then?
Yes, Sigma 105mm EX has a completely different optical design from the HSM. The old one is 11 elements in 10 groups, the HSM is 16 elements in 10 groups.
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balacau View Drop Down
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Post Options Post Options   Quote balacau Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2019 at 17:06
Originally posted by addy landzaat addy landzaat wrote:

Originally posted by balacau balacau wrote:

I wonder if the PRE-HSM version has a different optical construction then?
Yes, Sigma 105mm EX has a completely different optical design from the HSM. The old one is 11 elements in 10 groups, the HSM is 16 elements in 10 groups.


Thank you for the confirmation.
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Post Options Post Options   Quote owenn01 Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2019 at 20:58
Mike - just go out and buy it; for the price they're asking it's probably a bargain and I am very pleased with mine for it's overall performance on an a99 (and I have a 58/1.2 to compare it to!).

if it's a dog you can always sell it on with, probably, little loss.

Go on - it's only money

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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2019 at 23:07
Originally posted by LAbernethy LAbernethy wrote:

Originally posted by Phil Wood Phil Wood wrote:

Originally posted by LAbernethy LAbernethy wrote:

... For me it's a best and worst situation. My Minolta AF 50mm 1:2.8 Macro is my favorite macro lens and my Minolta AF 50mm 1:2.8 Macro RS is my worst performing macro lens; ...

A bit worrying; I ordered a 50mm f2.8 RS hoping for 50mm f2.8 performance plus focus limiter and the lens button. Thankfully it was not too pricey!

When I pick it up next week I shall be very interested to see how it performs.


My experience with the RS put me off picking up the Sony version and opted for a Tamron 90mm 2.8 macro to replace my Sigma.


The RS has arrived - initial impressions are good. It seems pin-sharp, well built and in great nick. The focus limiter and focus hold are a nice addition to the original lens. Nevertheless I still feel the love for the older model, there is just something about those 1985 lenses. I have the strange feeling that the RS is the better lens, but I just don't like it as much (yet - lenses have been known to grow on me).
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