Originally posted by hjoseph7 I'm thinking about selling my 77mm f1.8 Limited lens for the Pentax DA* 60-250mm f4. The reason is I find it hard finding subjects that fall in the 77mm range which on a cropped camera is actually 115mm. For head and shoulder portraits its OK, but I rarely shoot portraits anymore. I think that the 60-250 would give me more flexibility although its only an f4. Would I be missing something if I decide to sell ?
Like some other have say, the key question to ask first is:
The 60-250? For what use? If you have many cases of use for it, then it is worth to buy. That becaus you think you should get it.
And there of course another point: if you don't use/don't like you FA77, you should sell it, even if you buys nothing else in exchange. There no point to keep something expensive like that for no reason.
Sure to ensure you don't spend too much you can combine the 2 in a single operation.
But if you want to optimize money really neither FA77 or 60-250 are good choice. a 70-200 f/2.8 from tamron (comparable in size to the 60-250) give the same reach except for infinite focus, comes with f/2.8 that help a lot in low light and for subject separation, is FF compatible, does 1:2 macro and is costing less than half the price of the 60-250.
You could for the same price as selling the 77 to get the 60-250, get the tarmon 70-200 and keep the FA77... Or sell the FA77 and fully found the tamron and keep more money in the bank.
But for me you need a real use case for an heavy telezoom. The FA77 with a bit of cropping already get you up to 120mm without issue. Not much different than what the 60-250 does at close focus distance. The large apperture help significantly in low light or for subject separation... If you buy the 60-250 this is really either for the zooming comfort itself or the 150-250mm range. Not the 77-120mm range you could get away just by cropping a bit. And you are spending lot of money to get it with the 60-250 as well as getting much more weight in the bag !!!
Are you sure the 60-250 is the lense for you? Wouldn't be better to get a 135mm prime ? It is already all the reach you might need except for wildlife, much smaller, much lighter, much less expensive: I got my F135 for 318€, 60-250 is 1200€, 4 time more expensive. Or is it the wildlife? But then really wouldn't a 150-450 a better choice? Sure you pay more but for wildlife and getting some great shoots, you'll may want to add the TC to the 60-250 anyway... And the 150-450 is a modern fast lense that seem to perform very well...
Maybe what you need first is to get an innexpensive 55-300, see if you really need a tele, and what focal length you really use... The apperture is not really an issue as otherwise the f/4 of the 60-250 would already be a compromize. And the 55-300 closed to f/8 is quite good.
Then you'll be able to make an informed decision if 250-300mm is enough or not, if you ever use long focal length anyway, if you are happy to gather big lenses with you...