Tamron AF Aspherical LD 28-200mm f3.8-5.6

In an earlier post (See: A couple of Pentax autofocus SLRs) I mentioned that I had acquired a couple of inexpensive Pentax AF SLRs with lenses. The bodies were pretty much dead on arrival, but it seemed to me that the lenses were in working condition.

I was right: both of the lenses work fine. This is the first of them. I’m unable to comment on the lenses autofocus performance as I used it on a Sony NEX 5N where only manual focus was possible. Maybe in the future I’ll try it out on my one and only Pentax AF film body

It’s a typical superzoom lens. It has a useful range (28-200mm), although less useful than it might be on a crop sensor where it becomes a 35mm equivalent of around 42-300mm. You gain on the tele end, but pretty much lose all wide-angle capabilities.

It’s a bit ‘plasticky’, but nonetheless feels solid and well made. It’s fairly small and light for this kind of lens. The zoom lens on mine was a little stiff, but not too bad. With use it will probably loosen up. There’s something about the manual focus ring that I like though. I don’t know why.

Image quality if pretty much what you’d expect from a lens of this type. It’s fairly soft wide open (particularly so at the long end) but improves when you stop down and by f8 it’s OK. The lens tends to flare quite a lot when pointed towards a light source so a lens hood it definitely in order. The lens originally came with a hood, but my second hand copy didn’t include it. There’s a lot of chromatic aberration and both pincushion and barrel distortion at various points of the zoom range. Contrast seemed a little low and the colors seemed a little muted. Most of the above can easily be corrected in post production however. I shoot everything in RAW so I have to edit my pictures in any case.

Providing your expectations are not too high this is a decent enough lens. Of course to pack such a long zoom range into such a small, lightweight package requires significant compromises. What you gain in terms of convenience and ease of use you lose in terms of image quality. If you can accept these compromises then you’ll probably like this lens. If you can’t then you certainly won’t.

For me I quite like it. I spend quite a lot of my time walking the dog in the woods around where I live. For these walks I much prefer to have a single superzoom lens than to have to carry around a multitude of single focal length or shorter zoom lenses.

Below a picture shot using this lens of a lily in our garden.

For more pictures taken with this lens see:

Taken with a Sony Nex 5N and Tamron AF Aspherical LD 28-200 f3.8-5.6

A couple of Pentax autofocus SLRs

For a while now I’ve been developing a liking for autofocus SLRs. There are two reasons for this: 1) I seem to have completely missed the autofocus SLR era going directly from a manual focus Canon AE-1 to digital; 2) Nobody seems to want to lower end models so they’re often ridiculously inexpensive.

So when I saw these two Pentax AF SLRs, each with its own lens, going for a low price I couldn’t resist. It was fairly obvious that the seller knew little about cameras so I was taking a chance, but seemed to be worth a gamble. I already had an adapter for Pentax lenses so if worst came to the worst I could use them with my Sony NEX 5n.

The two cameras are a Pentax ZX-5N and a ZX-50 and the lenses a SMC Pentax-F Zoom f3.5-4.5 35-70mm and a Tamron AF Aspherical LD 28-200mm f3.8-5.6.

When they arrived the bodies had a very solid feel to them and seemed to be in excellent shape. Unfortunately, the worst did come to the worst. The ZX-5N was dead on arrival. The mirror was stuck in limbo and after some research I discovered that this is a common problem with the ZX series cameras. Apparently a plastic part in the mirror motor breaks rendering the mirror inoperative. Parts are no longer available so there’s not much you can do about it. The ZX-50 seemed at first as if was working until a pressed the shutter release. Then there was a ‘whirring’ sound just like the ZX-5N was producing so I guess it was the same problem.

So neither of the bodies worked so on to trying out the lenses. I quickly got my adapter and tried both lenses on the Sony NEX 5N. They both fitted and worked well – phew!

So if there’s a message here it’s probably that it’s wise to avoid Pentax ZX series cameras, attractive though they may be.

I’ve tried out the lenses a bit more extensively now, but that’s the subject for another post.

Taken with a Sony A77 II and Tamron A1 AF 18-250mm.