Which one should I keep?

I am building up a nice set of MF prime lenses at the minute and have ended up with two 28mm ones. A Tamron adaptall 2 28mm 2.5 and a Pentax M 28mm 2.8. Is it worth keeping them both? I cant make my mind up

Which one should you keep? Well the one you prefer would be my advice

Is it worth keeping them both? probably not but when has that ever stopped us owning lenses

Glad I helped you clear that one up

Sorry couldn't resist - to me the M is the better lens -but you don't mention your view on either of them.

Carl

There is not a strong argument for keeping both. All else being equal, I should keep the Pentax. It will be consistent in terms of appearance, handling, and (most importantly) colour, with your other Pentax lenses.

However, the M is not a notably sharp lens, and if the Tamron is discernibly sharper, you might choose to keep it instead.

Time for some testing, methinks.

G

To me it is obvious, the Pentax!

It may be obvious to you, Walkeja, but it's not obvious to the OP. If it had been obvious, he would not have asked the question.

So your answer is not very helpful.

WHY do you think the Pentax is the better lens to keep?

G

I think I need to do what george suggested and test them both first

For me it depends how important using the Tamron on another system would be, or which mount(s) you have for it. For a DSLR a 'KA' mount is preferable but I also have the 'KM' mount which repeats the aperture scale in the right place to show up in the finder of an MX/LX.

The Pentax will focus the same way as the other Pentax's (the Tamron probably goes the other way).

Depends also on the value you can get for them, I've sold a lot of gear in the past and often paid substaintially more to buy another one back.

I'd prefer the Pentax on Pentax camera, but then my M 28/2.8 focus ring jammed yesterday...

Do you need the money? Or the space? I have half a dozen different 28mm lenses and I don't intend to get rid of any of them.

K.

Some people have wives.

G

How about I keep it then? The Pentax I mean.

Sell them both and get one of the Vivitar Close Focus varieties.

I have one of those but prefer my K28/3.5.

K.

Who wouldn't? It's probably Pentax's best 35mm. But almost as rare as hen's teeth.

G

I think you will find that it is hens' teeth.

I thought some of the f/2 versions were supposed to be better still? Still, they are even rarer and more expensive. I paid enough for the f/3.5 version!

K.